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Jurnal Penelitian Pengelolaan Daerah Aliran Sungai

JPPDAS
Website

Published by Balai Litbang Teknologi Pengelolaan Daerah Aliran Sungai

ISSN : 25795511 EISSN : 25796097 DOI : -

Core Subject : Agriculture,

Agriculture, Biological Sciences & Forestry

Jurnal Penelitian Pengelolaan Daerah Aliran Sungai (JPPDAS) ) is an official publication that publishes scientific papers of research results in the field of watershed management. This Journal was published primarily by Watershe Management Technology Center on April 2017. Journal scopes include are land and vegetation management, soil and water conservation, land rehabilitation, hydrology, social, economic, institutional, remote sensing and Geographic Information Systems (GIS) that support watershed management technologies.

Arjuna Subject : -

Articles 67 Documents

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EVALUASI LAHAN UNTUK MENILAI KINERJA SUB DAERAH ALIRAN SUNGAI RAWAKAWUK (Land evaluation to assess performance of Rawakawuk Sub Watershed) Nining Wahyuningrum; Pamungkas Buana Putra
Jurnal Penelitian Pengelolaan Daerah Aliran Sungai (Journal of Watershed Management Research) Vol 2, No 1 (2018): Jurnal Penelitian Pengelolaan Daerah Aliran Sungai (Journal of Watershed Managem
Publisher : Center for Implementation of Standards for Environmental and Forestry Instruments Solo

ABSTRACTLand is an important resource in a watershed because of its position as a processor. The condition of a watershed depends on the land management and its compliance with its performance. The purpose of the research is to evaluate the performance of Rawakawuk Sub Watershed from the land aspects. Guidelines of Watershed Evaluation and Monitoring, i.e. the Regulation of Director General of Land Rehabilitation and Social Forestry or PerDirjen 04/V-Set/2009 was used to analyze parameters of Vegetation Cover Index (VCI), Land Use Suitability Index (LUSI), and Erosion Index (EI). The results showed that the study area has 53% of pine and teak monoculture, and 20.7% of agroforestry private forest, therefore the VCI is 73.2%. The LUSI is 93.7% which implies that 93.7% of the area is suitable to its land capability. In addition, 36.1% of the area is exposed to very severe erosion. Since the solum depth is relatively deep (>90 cm), the tolerable soil erosion is high and EI tends to be small. Around 60.3% of the area has an average EI of 71.1 which is classified as moderate. Based on the cumulative value of VCI, LUSI and EI, Rawakawuk Sub Watershed can be classified as slightly good. However, conservation practices should be applied to the very severe erosion areas. Keywords: watershed; forest; degradation; performance; permanent vegetation ABSTRAKLahan merupakan sumber daya penting dalam pengelolaan Daerah Aliran Sungai (DAS) karena kedudukannya sebagai prosesor. Baik buruknya suatu DAS tergantung kepada pengelolaan dan kesesuaian lahan dengan daya dukungnya. Tujuan penelitian ini adalah melakukan evaluasi kinerja Sub DAS Rawakawuk dari aspek lahan. Analisis dilakukan dengan menggunakan Pedoman Monitoring Evaluasi DAS, Peraturan Direktur Jenderal Rehabilitasi Lahan dan Perhutanan Sosial Nomor 04/V-Set/2009 dengan parameter: Indeks Penutupan Vegetasi (IPV), Indeks Kesesuaian Penggunaan Lahan (IKPL), dan Indeks Erosi (IE). Hasil analisis menunjukkan bahwa di sub DAS tersebut 53% merupakan hutan produksi pinus dan jati berpola monokultur dan 20,7% hutan rakyat berpola agroforestri dengan nilai IPL 73,2%, nilai IKPL 93,7% yang menunjukkan 93,7% lahan sesuai dengan kelas kemampuannya. Berdasarkan perhitungan erosi, 36,1 % area memiliki tingkat erosi sangat berat (SB), namun kondisi solum tanah yang tebal (>90 cm) mengakibatkan nilai erosi yang diperkenankan juga tinggi, sehingga nilai indeks erosi cenderung kecil. Pada 60,3% lahan Sub DAS Rawakawuk memiliki indeks erosi rata-rata sebesar 71,1% yang termasuk pada kategori sedang. Berdasarkan nilai kumulatif IPL, IKPL dan IE disimpulkan bahwa lahan Sub DAS Rawakawuk mempunyai kinerja dalam kategori agak baik, namun perlu penerapan konservasi tanah pada beberapa lokasi dengan kelas erosi sangat berat.Kata Kunci: DAS; hutan; degradasi; daya dukung; vegetasi permanen

FAKTOR YANG BERPENGARUH TERHADAP TINGKAT KERAPATAN EROSI PARIT DI DAERAH ALIRAN SUNGAI KALIWUNGU (Factor influencing density level of gully erosion in Kaliwungu Watershed) Surya Sabda Nugraha; Junun Sartohadi
Jurnal Penelitian Pengelolaan Daerah Aliran Sungai (Journal of Watershed Management Research) Vol 2, No 1 (2018): Jurnal Penelitian Pengelolaan Daerah Aliran Sungai (Journal of Watershed Managem
Publisher : Center for Implementation of Standards for Environmental and Forestry Instruments Solo

ABSTRACTDistribution and density level of gullies reflect the level of land degradation on a watershed. This research aims to identify the distribution of gully and to calculate the density level of gully erosion in Kaliwungu Watershed. The distribution of gully was obtained through field survey, while the density level was analyzed based on landuse and landform maps. Gully distribution was overlayed on landuse and landform maps. Landuse was delineated by interpreting aerial photograph of Kaliwungu Watershed. Aerial imagery supported by the result of Sentinel image processing was used to observe vegetation density. Landform and slope were delineated from DEM. Catchment area of gully erosion were delineated by DEM and aerial photograph interpretation of Kaliwungu Watershed. Gully density is calculated by comparing erosion length and erosion volume to the catchment area extent. Descriptive analysis was used to determine the factors that influenced gully. The analysis was conducted based on the result of overlaying gully distribution on landuse and landform maps. The result of this research were a 1:10.000 map of gully distribution and density level of gully erosion in Kaliwungu Watershed. There were three density classes of gully in Kaliwungu Watershed which are high, medium, and low. The formation process of intensive gully only takes place at some intensively land cultivation points or at some land that has been highly disturbed by human activities. The result shows that landuse and land cultivation was the factors that influenced the formation of gully erosion.Keywords: density of gully erosion; land use; landform ABSTRAKSebaran erosi parit dan kerapatannya menggambarkan tingkat degradasi lahan pada suatu Daerah Aliran Sungai (DAS). Tujuan penelitian adalah untuk mengetahui sebaran erosi parit dan tingkat kerapatannya di DAS Kaliwungu. Sebaran Erosi parit diperoleh melalui survei lapangan. Kerapatan erosi parit dianalisis berdasarkan penggunaan lahan, bentuk lahan serta karakteristik yang ada di dalamnya. Daerah tangkapan erosi parit kemudian ditumpangsusun dengan peta penggunaan lahan dan peta bentuk lahan. Peta penggunaan lahan diperoleh berdasarkan interpretasi foto udara. Foto udara juga digunakan untuk melihat tingkat kerapatan vegetasi dan didukung dengan data hasil pengolahan citra Sentinel. Data Digital Elevation Model (DEM) digunakan sebagai dasar interpretasi bentuk lahan dan identifikasi kelas lereng. Daerah tangkapan erosi parit dibatasi berdasarkan interpretasi data DEM dan foto udara. Kerapatan erosi parit diukur menggunakan perbandingan panjang erosi parit dengan luas daerah tangkapan erosi parit dan volume erosi parit juga dengan luas daerah tangkapannya. Analisis data untuk mengetahui faktor yang berpengaruh terhadap kerapatan daerah tangkapan erosi parit dilakukan secara deskriptif. Analisis dilakukan berdasarkan hasil tumpangsusun tingkat kerapatan erosi parit pada peta penggunaan lahan dan peta bentuk lahan. Hasil penelitian berupa peta sebaran erosi parit dan peta tingkat kerapatan erosi parit DAS Kaliwungu skala 1:10.000. Terdapat tiga kelas kerapatan erosi parit di DAS Kaliwungu yaitu tinggi, sedang, dan rendah. Proses pembentukan erosi parit yang sangat intensif hanya terjadi pada beberapa titik dengan pengolahan lahan yang cukup intensif ataupun pada lahan yang sudah sangat terusik oleh aktivitas manusia. Hasil penelitian menunjukkan faktor yang mempengaruhi proses pembentukan erosi parit adalah penggunaan lahan dan pengolahan lahan.Kata kunci: erosi parit; kerapatan; penggunaan lahan; bentuk lahan

TRADISI DAN RELIGI SEBAGAI UPAYA KONSERVASI MATA AIR MASYARAKAT PERDESAAN: STUDI KASUS MASYARAKAT KECAMATAN GIRIMULYO, KABUPATEN KULON PROGO (Tradition and religion as means of the rural community in spring conservation: a case study of Girimulyo Distric, Kulon Progo Region) Sudarmadji Sudarmadji; Fajar Sugiarto; Ratna Destra Kurniasari; Indra Agus Riyanto; Ahmad Cahyadi; Sudrajat Sudrajat
Jurnal Penelitian Pengelolaan Daerah Aliran Sungai (Journal of Watershed Management Research) Vol 1, No 1 (2017): Jurnal Penelitian Pengelolaan Daerah Aliran Sungai (Journal of Watershed Managem
Publisher : Center for Implementation of Standards for Environmental and Forestry Instruments Solo

Tradition and religion interact closely to the rural community, which is shown in their culture. This concept was applied to spring conservation in the rural area. The objective of this research was to show the role of tradition and religion in the use of spring based conservation by rural community. This research used a case study method. Data were collected by field surveys and interviews. The respondents were chosen randomly because the characteristic of the community was homogenous. The results of this research showed that tradition and religion in form of cultural ritual called spring cleaning (nguras sumber) and “be grateful to God” (slametan) had been capable to keep the sustainability of water resources in the spring, both the quantities and qualities of water. Nguras Sumber and Slametan were directed by a traditional leader called “Juru Kunci” followed by the community. The water resources were used for domestic water consumption, tourism, agriculture, and livestock throughout the year, even excessive in the rainy season. Therefore, the culture of Nguras Sumber and Slametan could be maintained as a form of spring’s conservation.

ANALISIS BANJIR CIMANUK HULU 2016 (Upper Cimanuk flood analysis of 2016) Endang Savitri; Irfan Budi Pramono
Jurnal Penelitian Pengelolaan Daerah Aliran Sungai (Journal of Watershed Management Research) Vol 1, No 2 (2017): Jurnal Penelitian Pengelolaan Daerah Aliran Sungai (Journal of Watershed Managem
Publisher : Center for Implementation of Standards for Environmental and Forestry Instruments Solo

The causes of floods can vary, but they are rarely caused by only one factor. The purpose of this research is to find the cause of flood that hit Garut City on 20 September 2016. The method used is flood water supply analysis and flooded area analysis which is developed by WMTC Solo. The results showed that the water supply in the Upper Cimanuk watershed was very high due to high rainfall the day before (110 to 255 mm /day), high antecedent soil moisture (35 to 44 mm), very vurnerable (52%) land condition on Upper Cimanuk watershed due to land use that was not in accordance with its ability and forest area which only 17.9% of the watershed area. Based on the analysis of flooded areas, which was flat area around the river were identified as prone areas to flood such as Garut, South Tarogong and Cilawu. The flood potential in the Upper Cimanuk watershed can be reduced by changing the land use pattern on the very sloping land from vegetable farming to agroforestry, reforestation, and applying soil conservation practices. For flooded areas the reduction of flooding can be conducted by increasing the drainage channel, building infiltration wells and dykes along the river and managing the riparian.

SIMULASI MODEL DINAMIK PENGARUH LEGUME COVER CROPS (LCC) TERHADAP LIMPASAN DAN SEDIMEN DI LAHAN HUTAN TANAMAN (Dynamic model simulation of the effects of Legume Cover Crops (LCC) on runoff and sediment in plantation forest land) Agung Budi Supangat; Putu Sudira; Haryono Supriyo; Erny Poedjirahajoe
Jurnal Penelitian Pengelolaan Daerah Aliran Sungai (Journal of Watershed Management Research) Vol 2, No 1 (2018): Jurnal Penelitian Pengelolaan Daerah Aliran Sungai (Journal of Watershed Managem
Publisher : Center for Implementation of Standards for Environmental and Forestry Instruments Solo

ABSTRACTDeclining productivity of plantation forest due to low soil fertility. This condition has forced managers to make efforts in manipulating the tree growing environment. One such effort is by introducing cover crops species from legumes (LCC), to control surface runoff, soil erosion and input nutrient into the soil. The research aims to determine the effectiveness of LCC in controlling total runoff and sedimentation in Eucalyptus pellita plantations, through dynamic model simulation. The dynamic model of STELLA version 9.0.2 was used to study water and nutrient cycles, focused on the application of LCC to reduce total runoff and sedimentation. The results showed that LCC could drop the total runoff of average 35% in the 1 - 2 years old. In the 1styear it decreased from 1,530 mm to 994 mm, while in the 2ndyear it decreased from 1,240 mm to 806 mm. The declining also occurred in the sediment content, in the 1st year it decreased from 12.20 tonnes/ha to 7.93 tonnes/ha, and the 2nd year it decreased from 6.63 tonnes/ha to 4.36 tonnes/ha. These research findings can be used by the environmental manager to minimize potential land degradation, especially during the post-harvest until the young plantations (0-2 years old) phases.Key words: plantation forest; E. pellita; dinamic model; legume cover crops; erosion; runoff ABSTRAKPenurunan produktivitas hutan tanaman akibat rendahnya tingkat kesuburan tanah memaksa pengelola melakukan berbagai upaya manipulasi lingkungan pertumbuhan. Salah satu upaya tersebut adalah introduksi tanaman penutup tanah dari jenis legum (LCC) untuk mengendalikan laju aliran permukaan dan erosi tanah serta input hara ke dalam tanah. Tujuan penelitian adalah untuk mengetahui efektivitas LCC dalam mengendalikan laju limpasan permukaan dan sedimentasi di hutan tanaman E. pellita, melalui simulasi pemodelan sistem dinamik. Model dinamik STELLA versi 9.0.2 dimanfaatkan untuk mempelajari siklus air dan hara yang terjadi, dengan fokus simulasi aplikasi LCC untuk mengurangi total limpasan dan sedimentasi. Hasil simulasi menyimpulkan pengaruh aplikasi LCC pada pascatebangan dapat menurunkan total limpasan pada tanaman berumur 1 sampai 2 tahun sebesar rata-rata 35%. Pada tahun pertama menurun dari 1.530 mm menjadi 994 mm, sedangkan pada tahun kedua menurun dari 1.240 mm menjadi 806 mm. Penurunan juga terjadi pada kandungan sedimen, pada tahun pertama menurun dari 12,20 ton/ha menjadi 7,93 ton/ha, dan tahun kedua menurun dari 6,63 ton/ha menjadi 4,36 ton/ha. Hasil tersebut dapat menjadi input bagi pengelola sebagai dasar pengelolaan lingkungan untuk meminimalkan potensi degradasi lahan khususnya pada fase pasca tebangan sampai tanaman muda (0-2 tahun).Kata kunci: hutan tanaman; E. pellita; model dinamik; legume cover crops; erosi dan runoff

ANALISIS KERENTANAN TANAH LONGSOR SEBAGAI DASAR MITIGASI DI KABUPATEN BANJARNEGARA (Vulnerability analysis as a basic for landslide mitigation in Banjarnegara Regency) Pranatasari Dyah Susanti; Arina Miardini; Beny Harjadi
Jurnal Penelitian Pengelolaan Daerah Aliran Sungai (Journal of Watershed Management Research) Vol 1, No 1 (2017): Jurnal Penelitian Pengelolaan Daerah Aliran Sungai (Journal of Watershed Managem
Publisher : Center for Implementation of Standards for Environmental and Forestry Instruments Solo

ABSTRACTWater erosion is one of the causes of degraded land and a decrease in land productivity. Improvement of degraded land needs to detect sources of erosion and vulnerability level of the degraded land. The research was conducted to predict the vulnerability of soil erosion and distribution of degraded land in order to support the implementation programme of Land Rehabilitation and Soil Conservation. The research was conducted in upper Solo Watershed. Soil erosion was predicted using Universal Soil Loss Equation (USLE). The analysis of Land Capability Class was undertaken to determine the suitability of current landuse with its capability. Analysis of critical land was based on the regulations of the Directorate General of Watershed Management and Social Forestry (BPDAS-PS) Nomor 4/V-SET/2013. The data used were DEM (Digital Elevation Model) Aster (30 m x 30 m), map of the Regional Physical Planning Program for Transmigration (RePPProT) scale 1: 250,000, map of forest area (1: 50,000) from BPKH (Forest Zone Determination Center), land cover map from BPKH (1: 50,000), Google Earth imagery, rainfall data from 93 rain stations and field surveys. The results show that the upper Solo Watershed is dominated by land categorized as potentially degraded (54%), followed by slightly degraded (35%), while land which is classified as degraded occupied 7% of the total watershed. The dominant land capability is categorized as Vth class and limited by soil erosion (89%). Dry land agriculture areas were found at land capability VIth and VIIth which should not utilized for agricultural activities. Implementation of agroforestry and teracing are alternatives to prevent further land degradation and to improve the current condition.Keywords: degraded; land; planning; watershed; rehabilitation ABSTRAKErosi oleh air merupakan salah satu penyebab terjadinya degradasi dan penurunan produktivitas lahan yang mengakibatkan lahan kritis. Upaya perbaikan lahan-lahan kritis perlu mendeteksi sumber-sumber penyebab erosi dan tingkat kekritisan lahan. Penelitian ini dilakukan untuk mengetahui tingkat erosi dan distribusi lahan kritis dengan tujuan agar penerapan program Rehabilitasi Lahan dan Konservasi Tanah dapat tepat sasaran dan lahan berfungsi optimal. Penelitian dilakukan di Daerah Aliran Sungai (DAS) Solo bagian hulu. Besarnya erosi tanah diprediksi dengan Universal Soil Loss Equation (USLE). Analisis KPL (Kemampuan Penggunaan Lahan) dilakukan untuk mengetahui kesesuaian penggunaan lahan dengan kemampuannya. Analisis lahan kritis didasarkan pada peraturan Ditjen Bina Pengelolaan DAS dan Perhutanan Sosial (BPDAS-PS) No.4/VSET/2013. Data yang digunakan berasal dari analisis DEM (Digital Elevation Model) Aster ukuran 30 m x 30 m, peta Regional Physical Planning Program for Transmigration (RePPProT) skala 1: 250.000, peta kawasan hutan skala 1: 50.000 dari BPKH (Balai Penetapan Kawasan Hutan), peta penutupan lahan BPKH skala 1: 50.000, Citra Google Earth, data hujan dari 93 stasiun hujan dan survey lapangan. Hasil penelitian menunjukkan bahwa DAS Solo bagian Hulu didominasi lahan yang potential kritis (54%), diikuti agak kritis (35%), dan yang kritis 7%. Kemampuan Penggunaan Lahan (KPL) yang dominan adalah kelas V dengan pembatas utama erosi (89%). Dijumpai areal tegalan pada lahan dengan KPL VI dan VII yang seharusnya tidak sesuai untuk pertanian. Upaya yang dilakukan untuk tetap mempertahankan areal yang belum kritis dan memperbaiki areal yang sudah kritis adalah penerapan agroforestri dan terasering.Kata kunci: degradasi; lahan; perencanaan; DAS; rehabilitasi

KONDISI LINGKUNGAN DAN KARAKTERISTIK SOSIAL BUDAYA UNTUK PENGELOLAAN DAERAH ALIRAN SUNGAI (Studi Kasus pada Suku Dani di Jayawijaya, Papua) (Environmental conditions and socio-cultural characteristics for watershed management (Case study at Dani tribe, Jayawijaya, Papua)) Baharinawati W. Hastanti
Jurnal Penelitian Pengelolaan Daerah Aliran Sungai (Journal of Watershed Management Research) Vol 1, No 2 (2017): Jurnal Penelitian Pengelolaan Daerah Aliran Sungai (Journal of Watershed Managem
Publisher : Center for Implementation of Standards for Environmental and Forestry Instruments Solo

Upper of Mamberamo watershed located at Jayawijaya regency, a plain (valley) in Jayawijaya mountains, that known as the Baliem valley. In this valley lies Tariratu river (Idenburg river) which is a tributary of Mamberamo river. Dani tribe, the oldest tribe inhabits this fertile region. In addition to known as belligerent, Dani tribe known as swidden farmers with certain traditional wisdom to maintain the soil fertility. Environmental condition and socio-cultural characteristics community in managing the upper watershed influence the watershed management, especially in the downstream. This study aims to determine the environmental and socio-cultural characteristics of the Dani tribe in managing the natural resources in the upper watershed to support Mamberamo watershed management. This study was conducted at Wamena, Jayawijaya regency, Papua province. This research is qualitative descriptive research. Data collections was conducted by interviews and literature studies. The data were analysed qualitatively and described the environmental conditions and socio-cultural characteristics of people in the upper watershed of Mamberamo or Baliem watershed is the major element in the management of the Mamberamo watershed. The upper watershed has a conservation function to reduce land degradation. The Dani tribe in the upper Mamberamo has local wisdoms that support the vegetation, soil and water conservation’s function.

DAYA DUKUNG LAHAN DI KAWASAN HUTAN DENGAN TUJUAN KHUSUS (KHDTK) GOMBONG (Carrying capacity of land in Forest Area for Specific Purpose (KHDTK) Gombong) Nur Ainun Jariyah
Jurnal Penelitian Pengelolaan Daerah Aliran Sungai (Journal of Watershed Management Research) Vol 2, No 1 (2018): Jurnal Penelitian Pengelolaan Daerah Aliran Sungai (Journal of Watershed Managem
Publisher : Center for Implementation of Standards for Environmental and Forestry Instruments Solo

ABSTRACTPopulation growth has an impact on increasing the need for land to fulfill people’s food, thus it may decrease the carrying capacity of land. Therefore, a study has been conducted to evaluate the carrying capacity of the land to meet the needs of the local community at Forest Area for Specific Purpose (KHDTK) Gombong, Kebumen District, Central Java. Secondary data collection was including population, land area, productivity and price from agriculture, plantation, forestry, livestock and fishery, rice prices at producer level. Another secondary data collection was collected from Central Bureau of Statistics of Kebumen, forest district service, districts and villages. Data were analyzed using a descriptive quantitative method by calculating the supply and demand of land to know carrying capacity of the land. The result of this research showed that the availability land in KHDTK Gombong was 68,559.72 ha while the required land was 101,909.56 ha, thus experiencing a deficit of - 33,349.84 ha. The deficit condition in KHDTK Gombong can be fulfilled from Kebumen regency that has a surplus or cooperate with other regions. This condition makes the attention of the local government to overcome KHDTK Gombong such as increase land availability, land conversion towards other more profitable business, land intensification with new technology and land conservation.Keywords: land supply; land demand; KHDTK Gombong; deficit ABSTRAKPertambahan jumlah penduduk berdampak pada peningkatan kebutuhan akan lahan untuk memenuhi pangan sehingga dikhawatirkan akan menurunkan daya dukung lahan. Untuk itu telah dilakukan penelitian yang bertujuan mengetahui daya dukung lahan di Kawasan Hutan Dengan Tujuan Khusus (KHDTK) Gombong dalam mencukupi kebutuhan masyarakat sekitar. Pengumpulan data sekunder meliputi: jumlah penduduk, luas lahan, produktivitas, dan harga produk (pertanian, perkebunan, kehutanan, peternakan, dan perikanan), serta harga beras di tingkat produsen. Pengumpulan data sekunder juga dilakukan di Badan Pusat Statistik Kabupaten Kebumen, dinas kehutanan, kecamatan, dan kelurahan. Data dianalisis dengan menggunakan deskriptif kuantitatif dengan menghitung ketersediaan (supply) dan kebutuhan (demand) lahan untuk mengetahui daya dukung lahan. Hasil penelitian menunjukkan bahwa ketersediaan lahan di KHDTK Gombong sebesar 68.559,72 ha dan kebutuhan lahan sebesar 101.909,56 ha, sehingga mengalami defisit sebesar -33.349,84 ha. Kondisi yang defisit di KHDTK Gombong dapat dipenuhi dari Kabupaten Kebumen yang mengalami surplus meskipun tidak menutup kemungkinan bekerjasama dengan wilayah lain. Daya dukung lahan di KHDTK Gombong dapat ditingkatkan dengan meningkatkan ketersediaan lahan, konversi lahan ke arah usaha lain yang lebih menguntungkan, intensifikasi lahan dengan teknologi baru, dan konservasi lahan.Kata kunci: ketersediaan lahan; kebutuhan lahan; KHDTK Gombong; deficit

KERENTANAN SOSIAL EKONOMI DAN BIOFISIK DAERAH ALIRAN SUNGAI SOLO (Socio-economic and biophysical vulnerability of Solo Watershed) Nur Ainun Jariyah; Irfan Budi Pramono
Jurnal Penelitian Pengelolaan Daerah Aliran Sungai (Journal of Watershed Management Research) Vol 2, No 2 (2018): Jurnal Penelitian Pengelolaan Daerah Aliran Sungai (Journal of Watershed Managem
Publisher : Center for Implementation of Standards for Environmental and Forestry Instruments Solo

ABSTRACTIncreasing degradation of watershed ecosystem is a problem that needs to be resolved. Therefore, a study was conducted in order to determine the socio-economic and biophysical vulnerability of Solo watershed in relation to watershed management. This research was conducted in Solo Watershed. The collected data include primary and secondary data. The potential and vulnerability of socio-economic and biophysical were evaluated using the The Formulation of Watershed level Characterization System. The results of the study showed that (1) the socio-economic of the whole Solo watershed classify as moderate category, with the highest vulnerable district was Wonogiri due to high population density and high land vulnerability, (2) land vulnerability for the whole Solo watershed is in the medium category, with the most vulnerable land category was in Madiun and upstream Solo sub-watersheds, (3) the most prominent flood vulnerability was in the downstream of Solo sub-watershed, (4) the typology of watershed management was classified as high vulnerable because the territorial typology was in the very high vulnerable and the watershed typology was medium vulnerable. By knowing its vulnerability level, the rehabilitation program can be directed to areas with a high level of vulnerability.Keywords: socio-economic; biophysical; vulnerability; watershed management ABSTRAKKerusakan ekosistem Daerah Aliran Sungai (DAS) yang semakin meningkat merupakan permasalahan yang perlu diselesaikan. Oleh karena itu telah dilakukan penelitian yang bertujuan untuk mengetahui kerentanan sosial ekonomi dan biofisik Daerah Aliran Sungai (DAS) Solo dalam kaitannya dengan pengelolaan DAS. Penelitian ini dilaksanakan di wilayah DAS Solo. Data yang diambil meliputi data primer dan sekunder. Potensi dan kerentanan sosial ekonomi serta biofisik dievaluasi dengan menggunakan formulasi Sistem Karakterisasi Tingkat DAS (Tipologi DAS). Hasil penelitian menunjukkan bahwa (1) tipologi sosial ekonomi keseluruhan DAS Solo termasuk dalam kategori sedang dengan kabupaten yang sangat rentan adalah Wonogiri yang dipicu oleh kepadatan penduduk dan kerentanan lahan yang tinggi, (2) kerentanan lahan di DAS Solo secara menyeluruh termasuk dalam kategori sedang dengan tingkat kerentanan lahan yang paling tinggi di Sub DAS Kali Madiun dan Solo Hulu, (3) kerentanan banjir paling tinggi di Sub DAS Solo Hilir, (4) tipologi pengelolaan DAS Solo secara keseluruhan termasuk dalam kategori kerentanan tinggi karena tipologi kewilayahan termasuk dalam kategori kerentanan sangat tinggi dan tipologi DAS termasuk dalam kategori kerentanan sedang. Dengan mengetahui tingkat kerentanan suatu DAS maka kebijakan program rehabilitasi dapat diarahkan ke daerah-daerah yang mempunyai tingkat kerentanan yang tinggi.Kata kunci: sosial ekonomi; biofisik; kerentanan; pengelolaan DAS

IDENTIFIKASI DAN MITIGASI KERENTANAN KEKERINGAN DAS MOYO (Identification and mitigation of drought vulnerability in Moyo Watershed) Endang Savitri; Irfan Budi Pramono
Jurnal Penelitian Pengelolaan Daerah Aliran Sungai (Journal of Watershed Management Research) Vol 2, No 2 (2018): Jurnal Penelitian Pengelolaan Daerah Aliran Sungai (Journal of Watershed Managem
Publisher : Center for Implementation of Standards for Environmental and Forestry Instruments Solo

ABSTRACTDrought identification is needed as a baseline for its mitigation. Several drought identification methods are available, but they need to be tested in dry climates. The purpose of this study was to identify dry area and its mitigation in Moyo Watershed, West Nusa Tenggara Province. Paimin and Syarif methods were used in the study. The results showed that the Paimin method produced a uniform vulnerability map, which was "medium vulnerable" for the entire watershed. This is because the applied parameters only have one class for the entire watershed. The Syarif method provides more variable results because the parameters produce several classes of vulnerabilities. However, the later method has a weakness in applying the depth of groundwater. Moyo watershed only had one class, whereas the depth of the groundwater level varied from 4 to 11 m in the dry season. The two methods produced the same results and there were classified as “medium susceptible” for Moyo watershed. For dry areas, it is necessary to reclassify the drought class of each parameter. By combining the two methods above, it is expected to obtain more accurate results. To get the Water Use Index parameter efficiently, the number of population and water usage should be more efficient. Extentions to the community about the effectively water usage is important. Adaptation to drought can also be done by making reservoirs and setting cropping patterns.Keywords: drought; vulnerability; mitigationABSTRAKIdentifikasi kekeringan diperlukan sebagai data dasar untuk mitigasi bencana kekeringan. Beberapa metode identifikasi kekeringan telah tersedia. namun perlu diujicobakan di daerah beriklim kering. Tujuan penelitian ini adalah identifikasi dan mitigasi kekeringan di DAS Moyo, Propinsi Nusa Tenggara Barat. Metoda yang digunakan dalam studi ini adalah metode Paimin dan Syarif. Hasil penelitian menunjukkan bahwa metoda Paimin menghasilkan peta kerentanan yang seragam, yaitu “agak rentan” untuk seluruh DAS. Hasil ini disebabkan karena parameter yang digunakan hanya mempunyai satu kelas untuk seluruh DAS. Metode Syarif memberikan hasil yang lebih bervariasi karena parameter yang digunakan untuk DAS Moyo menghasilkan beberapa kelas kerentanan. Namun metode ini mempunyai kelemahan dalam menerapkan kedalaman muka air tanah. Di DAS Moyo hanya mempunyai satu kelas, padahal kedalaman muka air tanah bervariasi dari 4 sampai 11 m pada musim kemarau. Kedua metoda yang digunakan menunjukkan hasil yang sama, yaitu kelas kerentanan kekeringan di DAS Moyo adalah “sedang” (metoda Syarif) atau “agak rentan” (metoda Paimin). Agar metode-metode tersebut cocok untuk daerah kering maka kelas kekeringan dari setiap parameter perlu di-reklasifikasi lagi. Dengan mengkombinasikan kedua metoda di atas diharapkan akan diperoleh hasil yang lebih baik. Pada parameter IPA, yang dapat dimodifikasi adalah jumlah penduduk dan penggunaan air yang lebih efisien. Pemanfaatan air secara efisien dapat dilakukan melalui penyuluhan kepada masyarakat. Adaptasi kekeringan dapat juga dilakukan dengan pembuatan embung dan tandon air serta pengaturan pola tanam.Kata kunci: kekeringan; kerentanan; mitigasi

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