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All Journal Jurnal Ilmu Lingkungan JURNAL SAINS DAN TEKNOLOGI INDONESIA JURNAL AIR INDONESIA Jurnal Sains & Teknologi Modifikasi Cuaca Jurnal Alami : Jurnal Teknologi Reduksi Risiko Bencana Jurnal Sains dan Teknologi Mitigasi Bencana
Hasmana Soewandita
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Agriculture, Biological Sciences & Forestry Computer Science & IT Earth & Planetary Sciences Education Environmental Science

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APLIKASI TEKNOLOGI BIOENGINEERING JEBAKAN SEDIMEN DI SUB DAS CITANDUY HULU Soewandita, Hasmana; Sudiana, Nana
Jurnal Air Indonesia Vol. 5 No. 1 (2009): Jurnal Air Indonesia
Publisher : Center for Environmental Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (596.751 KB) | DOI: 10.29122/jai.v5i1.2432

Abstract

Citanduy watershed  has been classified as a critical watershed in West Java. Sedimentation load at Citanduy watershed reach 5 milion cubic meters/years.  It is indicated that lagoon area “Segara Anakan” was decreased about 823 hectars. Land use changes for cultivation area at Citanduy upland causes acceleration  land degradation. Various efforts of the civil engineering and vegetative approach have been applied to control  erosion and sedimentation. Alternative technology for  controlling soil erosion and sedimentation is the application of sediment trap bioengineering.  It is application on micro catchment area, environment-friendly, and easily adapted for the farmers community.  The main for material of bioengineering sediment trap is  made of  Bamboo. Results of design that is applied in the critical area at Bukit  Bitung up land (Citaduy upland) Kecamatan Tambaksari, Ciamis Region, measuring the width between 100 cm to 150 cm, whereas the  height are between 80 cm to 100 cm. The application of this technology is effective sediment traps for micro catcment area of <5 hectars. Therefore for  a broad cachment area more sediment traps are required. In a period of not more than 1.5 month, the sediment trap  has been able to capture sediments up to 1 m3 per unit. The performance of sediment traps bioengineering also shown that bamboo as main components has grown up to not more than 30 days. The trapped sediments were restored back to the land for agricultural purposes after being add by agricultural waste. Sediments that have been processed at the same time also functions as soil amelioration or soil improvement. Key words : degradasi lahan, jebakan sedimen, bioengineering, sedimentasi, ameliorasi 
STUDI MUKA AIR TANAH GAMBUT DAN IMPLIKASINYA TERHADAP DEGRADASI LAHAN PADA BEBERAPA KUBAH GAMBUT DI KABUPATEN SIAK Soewandita, Hasmana
Jurnal Air Indonesia Vol. 4 No. 2 (2008): Jurnal Air Indonesia
Publisher : Center for Environmental Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (193.579 KB) | DOI: 10.29122/jai.v4i2.2407

Abstract

Overdrainaged phenomena on peat land after reclamated for agriculture area is indicated water management/water table control failure.  Water table depth of peat land on virgin forest that has been  reclamated is low (0.15 m) and this condition on Zamrud peat dome.  Water table dept on old reclamated peat land has better condition than peat land after new reclamated as plantation area. Peatland degradation showed overdrainage phenomena has potential happened on land clearing and  canal construction activity.  This condition have effected to water table dept  about 1 m. Overdrainaged impact on peatland has caused  fire of peatland.  For example this condition occured in  Siak Kecil peat dome and Kandis peat dome.  Keywords : peat dome, water table
KAJIAN PENGELOLAAN TATA AIR DAN PRODUKTIVITAS SAWIT DI LAHAN GAMBUT (STUDI KASUS : LAHAN GAMBUT PERKEBUNAN SAWIT PT JALIN VANEO DI KABUPATEN KAYONG UTARA, PROPINSI KALIMANTAN BARAT) Soewandita, Hasmana
Jurnal Sains & Teknologi Modifikasi Cuaca Vol 19, No 1 (2018): June 2018
Publisher : BPPT

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (442.739 KB) | DOI: 10.29122/jstmc.v19i1.3112

Abstract

Pengembangan lahan gambut untuk perkebunan kelapa sawit sudah demikian pesatnya akibat terbatasnya lahan mineral yang tersedia dalam hamparan yang luas. Tidak sedikit pemahaman akan karakteristik lahan gambut untuk pengembangan kebun kelapa sawit juga sangat terbatas baik aspek ekologi maupun agronomi dan tanah. Tujuan dari kajian ini adalah untuk mengkaji sistem tata air pada lahan gambut dalam kaitannya dengan karakteristik lahan baik aspek biofisik maupun lingkungan. Hasil kajian menunjukkan bahwa saluran reklamasi baik pada saluran utama maupun pada saluran blok banyak terjadi overdrainage dan hal ini sangat rentan terhadap bahaya kebakaran lahan gambut. Pemahaman karakteristik lahan gambut yang kurang memadai serta pengelolaan ketinggian muka air saluran yang kondisinya dibawah kedalaman lapisan pirit mengakibatkan terbentuknya oksidasi pirit. Saluran yang terindikasi terjadi oksidasi pirit terjadi pada saluran blok lahan pertanaman berimplikasi terbentuknya racun (jarosit), sehingga hal ini sangat berbahaya bagi pertumbuhan tanaman dan produksi kelapa sawit. Pirit yang teroksidasi ini mempunyai pH yang sangat masam sehingga kelaruran logam seperti Al sangat tinggi dan berdampak pada keracunan bagi tanaman. Pengendalian muka air diatas lapisan pirit, flushing dengan fresh water dan pengapuran merupakan solusi dalam penangan oksidasi pirit, sehingga produktivitas sawit bisa berkelanjutan.
ANALISIS KAWASAN RAWAN LONGSOR DAN KETERKAITANNYA TERHADAP KUALITAS TANAH DAN PENGGUNAAN LAHAN (KASUS DI KAWASAN AGRIBISNIS JUHUT KABUPATEN PANDEGLANG) Soewandita, Hasmana
Jurnal Alami : Jurnal Teknologi Reduksi Risiko Bencana Vol 2, No 1 (2018): Jurnal Alami
Publisher : Badan Pengkajian dan Penerapan Teknologi (BPPT)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29122/alami.v2i1.2826

Abstract

AbstractJuhut region based on the government policy of Banten Province in 2015 is an area that will be developed as a center of agribusiness development area. Its existence is located on the slopes of the hills and at the same time as a residential area allegedly as an area prone to landslides. Agriculture cultivation activities related to soil fertility conditions that are on the belt of the volcano, making this area attracts the community to conduct agricultural cultivation activities despite being on a slope land. The aims of this study are the biophysical analysis of landslide hazard areas and their relationship to soil quality and land use patterns.The method used in this study is observation and groundceck of field biophysical condition and overlay analysis of thematic map related to landslide prone condition. The results of the study indicate that the biophysical condition of the land indicates that the landslide prone areas are susceptible to 707.1 Ha (70%), while the high vulnerability area reaches 245.3 Ha (24%). Soil fertility causes attractive soil to be managed by the community for the cultivation of seasonal crops or horticultural crops that can further trigger a landslide. This is also because the soil type conditions also have physical properties that are vulnerable to the early behavior of seasonal changes (from dry season to rainy season).  Land use that is not suitability with morphological conditions of land and already managed by the community as an economic source will be a threat of high vulnerability to landslide hazards.Keywords :  agribisnis area, land slides hazard, soil biophysical, land quality
STUDI EKOLOGI LAHAN KORIDOR SUNGAI DAN STATUS KUALITAS PENGGUNAAN LAHAN DI WILAYAH DAS RAWAPENING Soewandita, Hasmana
Jurnal Alami : Jurnal Teknologi Reduksi Risiko Bencana Vol 1, No 1 (2017): Jurnal Alami
Publisher : Badan Pengkajian dan Penerapan Teknologi (BPPT)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1101.877 KB) | DOI: 10.29122/alami.v1i1.960

Abstract

Rawapening merupakan salah satu danau yang keberadaannya mempunyai peranan sangat penting bagi kehidupan masyarakat sekitarnya bahkan dikawasan sebelah hilirnya.  Kualitas ekologi perairan Rawapening dari tahun ke tahun terus menurun, baik daya tampungnya maupun kondisi kualitas airnya.  Peranan sungai sungai  dengan kondisi daerah tangkapannya turut menentukan keberadaan kualitas lingkungan ekologis Rawapening.  Tujuan dari studi ini adalah untuk mengetahui kondisi ekologi lahan koridor sungai sungai yang masuk Rawapening terkait isu penurunan kualitas ekologi Rawapening. Tata guna lahan di sekitar koridor sungai ternyata merepresentasikan kondisi tataguna lahan DAS Rawapening yaitu dari hutan, kebun campuran, semak belukar, sawah irigasi dan sawah tadah hujan.  Kondisi kualitas fisik kimia tanah juga sangat bervariasi namun secara umum mempunyai tingkat kesuburan yang baik.  Akan tetapi hasil studi menunjukkan terjadi penurunan degradasi lahan terkait perubahan tataguna lahan terutama perubahan penurunan luas kebun campuran dan berubah menjadi pola penggunaan permukiman dari 12431 Ha pada tahun 2003 menjadi 10625 Ha pada tahun 2010.  Regim tampungan air danu Rawapening yang ekstrim antara pada musim penghujan dan kemarau juga disebabkan oleh kondisi kualitas koridor sungai yang sudah terdegrdasi terutama perubahan pola penggunaan lahan dari daerah pengalirannya.
ANALISIS BENCANA KEKERINGAN DI WILAYAH KABUPATEN SERANG Soewandita, Hasmana
Jurnal Sains dan Teknologi Mitigasi Bencana Vol 13, No 1 (2018): Jurnal Sains dan Teknologi Mitigasi Bencana
Publisher : Badan Pengkajian dan Penerapan Teknologi (BPPT)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (916.867 KB) | DOI: 10.29122/jstmb.v13i1.3037

Abstract

Kekeringan merupakan bencana yang hampir sering  terjadi di daerah tropis karena adanya perubahan musim dari musim penghujan ke musim kemarau.   Ketidakseimbangan waktu antara dua musim ini bisa menyebabkan bencana banjir dan sebaliknya bencana kekeringa.   Begitu juga apa yang terjadi di wilayah Kabupaten Serang kecenderungan kejadian bencana kekeringan ini juga bisa terjadi baik dikawasan budidaya maupun dikawasan permukiman dimana air dimanfaatkan untuk keperluan sehari hari.  Tujuan dari penelitian ini adalah untuk mengkaji analisis bencana kekeringan di wilayah Kabupaten Serang.   Hasil kajian menunjukkan potensi kekeringan dari tingkat rendah hingga tingkat kelas tinggi.  Kekeringan kelas tinggi dimungkinkan kerena ketersediaan dan keterbatasan air pada rentang waktu yang relative lama.   Hasil analisis juga menunjukkan tingkat kelas sedang mencapai luasan 179.650 Ha yang potensi sebarannya di hampir setiap kecamatan.   Sedangkan tingkat kekeringan kelas tinggi terjadi pada area seluas 1.311 Ha dan terjadi di wilayah Kecamatan Pontang, Tanara, Waringin Kurung, Mancak, Padarincang, Kramatwatu, Ciomas, Cinangka, Bojonegara, Tirtayasa dan Anyar   Kekeringan ini terjadi dibeberapa wilayah di area persawahan untuk keperluan irigasi pertanian  maupun kawasan permukiman karena keterbatasan air bersih.  Akibat kekeringan ini di area persawahan menyebabkan produktivitas tanah jadi rendah.  Lahan sawah yang seharusnya bisa dua kali bahkan tiga kali tanam, ternyata dengan adanya bencana kekeringan ini hanya bisa satu kali atau paling banyak dua kali tanam dan setalah itu dalam kondisi bera.
STUDI MUKA AIR TANAH GAMBUT DAN IMPLIKASINYA TERHADAP DEGRADASI LAHAN PADA BEBERAPA KUBAH GAMBUT DI KABUPATEN SIAK Soewandita, Hasmana
Jurnal Air Indonesia Vol. 4 No. 2 (2008): Jurnal Air Indonesia
Publisher : Center for Environmental Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29122/jai.v4i2.2407

Abstract

Overdrainaged phenomena on peat land after reclamated for agriculture area is indicated water management/water table control failure.  Water table depth of peat land on virgin forest that has been  reclamated is low (0.15 m) and this condition on Zamrud peat dome.  Water table dept on old reclamated peat land has better condition than peat land after new reclamated as plantation area. Peatland degradation showed overdrainage phenomena has potential happened on land clearing and  canal construction activity.  This condition have effected to water table dept  about 1 m. Overdrainaged impact on peatland has caused  fire of peatland.  For example this condition occured in  Siak Kecil peat dome and Kandis peat dome.  Keywords : peat dome, water table
APLIKASI TEKNOLOGI BIOENGINEERING JEBAKAN SEDIMEN DI SUB DAS CITANDUY HULU Soewandita, Hasmana; Sudiana, Nana
Jurnal Air Indonesia Vol. 5 No. 1 (2009): Jurnal Air Indonesia
Publisher : Center for Environmental Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29122/jai.v5i1.2432

Abstract

Citanduy watershed  has been classified as a critical watershed in West Java. Sedimentation load at Citanduy watershed reach 5 milion cubic meters/years.  It is indicated that lagoon area “Segara Anakan” was decreased about 823 hectars. Land use changes for cultivation area at Citanduy upland causes acceleration  land degradation. Various efforts of the civil engineering and vegetative approach have been applied to control  erosion and sedimentation. Alternative technology for  controlling soil erosion and sedimentation is the application of sediment trap bioengineering.  It is application on micro catchment area, environment-friendly, and easily adapted for the farmers community.  The main for material of bioengineering sediment trap is  made of  Bamboo. Results of design that is applied in the critical area at Bukit  Bitung up land (Citaduy upland) Kecamatan Tambaksari, Ciamis Region, measuring the width between 100 cm to 150 cm, whereas the  height are between 80 cm to 100 cm. The application of this technology is effective sediment traps for micro catcment area of <5 hectars. Therefore for  a broad cachment area more sediment traps are required. In a period of not more than 1.5 month, the sediment trap  has been able to capture sediments up to 1 m3 per unit. The performance of sediment traps bioengineering also shown that bamboo as main components has grown up to not more than 30 days. The trapped sediments were restored back to the land for agricultural purposes after being add by agricultural waste. Sediments that have been processed at the same time also functions as soil amelioration or soil improvement. Key words : degradasi lahan, jebakan sedimen, bioengineering, sedimentasi, ameliorasi 
STUDI DINAMIKA KUALITAS AIR DAS CILIWUNG Soewandita, Hasmana; Sudiana, Nana
Jurnal Air Indonesia Vol. 6 No. 1 (2010): Jurnal Air Indonesia
Publisher : Center for Environmental Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29122/jai.v6i1.2449

Abstract

Ciliwung River which has upstream in Bogor, while downstream in Jakarta presence has very important role for the region in its path. Positive role of the river for the public interest in this area include the need of clean water sources, irrigation / agriculture, industry and others. Conversely Ciliwung River is also a source of flood disaster in Jakarta. Will consider its use, the risk of disaster resources and environmental burdens are received by the waters and the water catchment area is very large, then the existence of river quality should be monitored both the water catchment conditions or water quality. For future purposes, it would require a management with specific deadlines (5 th, 10 th, 15 th) and targets based on the quality of the water quality standards (BMA) class III, II and I. The results of the current monitoring parameters BOD, COD, fecal Coli, Coliform has a value above the threshold of water quality standards specified. While DO in the downstream segment has a value below the water quality standards. Other parameters such as pH, TSS and nitrogen have a greater trend downstream, but the value of the water quality is still under water quality standards that are targeted. Keywords: Water quality, Water Quality standards, Ciliwung river.
Analisis Penyebab Kejadian dan Evaluasi Bencana Tanah Longsor di Desa Banaran, Kecamatan Pulung, Kabupaten Ponorogo, Provinsi Jawa Timur Tanggal 1 April 2017 Heru Sri Naryanto; Hasmana Soewandita; Deliyanti Ganesha; Firman Prawiradisastra; Agus Kristijono
Jurnal Ilmu Lingkungan Vol 17, No 2 (2019): Agustus 2019
Publisher : School of Postgraduate Studies, Diponegoro Univer

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1309.274 KB) | DOI: 10.14710/jil.17.2.272-282

Abstract

ABSTRAKBencana tanah longsor di Indonesia semakin sering terjadi dari tahun ke tahun. Bencana tanah longsor telah terjadi di Dusun Tangkil, Desa Banaran, Kecamatan Pulung, Kabupaten Ponorogo, Provinsi Jawa Timur pada tanggal 1 April 2017. Lokasi tanah longsor di Desa Banaran, Kecamatan Pulung, Kabupaten Ponorogo, Jawa Timur, terletak pada zona kerentanan tinggi. Tipologi tanah longsor berupa longsoran bahan rombakan, yang kemudian ke arah bawah (Kali Tangkil) berkembang menjadi tipe aliran bahan rombakan. Faktor-Faktor yang berpengaruh terhadap terjadinya tanah longsor lokasi penelitian adalah: kelerengan, batuan dan tanah, rekahan/retakan batuan, konversi lahan, drainase dan keairan, curah hujan tinggi, dan aktivitas manusia. Dari kesemuanya faktor-faktor tersebut,  yang paling dominan dan berpengaruh terhadap tanah longsor adalah: lereng yang curam, soil hasil pelapukan sangat gembur dan tebal, alih fungsi lahan dan curah hujan yang tinggi. Material longsoran tidak terkonsolidasi dengan baik sehingga masih mudah bergerak, dan kemungkinan pembendungan pada Kali Tangkil oleh material longsoran tersebut bisa berpotensi terjadinya banjir bandang. Beberapa permukiman yang berada di saekitar lokasi longsor mempunyai risiko tinggi dan sedang terhadap longsor, sehingga perlu dibangun kesiapsiagaan masyarakat, pembangunan sistem peringatan dini longsor serta untuk jangka panjang adalah relokasi jika memang kondisi semakin parah. Pertanian lahan kering pada lereng-lereng sebaiknya menggunakan pola agroforestry. Kawasan sub DAS berisiko longsor, sebaiknya dikembalikan fungsi lahan sebagai hutan konservasi atau hutan lindung seperti sebelumnya.Kata kunci: longsor, Ponorogo, curam, soil tebal, degradasi lahan, curah hujan tinggi, risikoABSTRACTLandslides in Indonesia are becoming increasingly frequent from year to year. A landslide disaster has occurred in Tangkil, Banaran Village, Pulung Sub-District, Ponorogo District, East Java Province on April 1, 2017. The location of landslides in Banaran Village, Pulung Sub-District, Ponorogo District, East Java, lies in the high vulnerability zone. The landslide typology is a debris slide, which then in the downstream direction (Tangkil River) develop into a type of debris flow. Factors that influence the occurrence of landslides in the study area are: slope, rock and soil, fracture, land conversion, drainage and irrigation, high rainfall, and human activities. Of all the influential factors, the most dominant factors for landslides are: steep slopes, weathered soil is very loose and thick,   land conversion, and high rainfall. Landslide material is not well consolidated so that it is still easy to move, and the possibility of damming the Tangkil River by landslide material can potentially cause flash floods. Some settlements located near landslide locations have high and moderate risks of landslides, so community preparedness needs to be built,     the establishment of landslide early warning systems and long-term relocation if the condition is getting worse. Dryland farming on slopes should use agroforestry patterns. Sub-watershed areas are at risk of landslides, the land should be restored as conservation forest or protected forest as before.Keywords: landslide, Ponorogo, steep slopes, thick soil, land degradation, high rainfall, risk
Co-Authors Agus Kristijono Deliyanti Ganesha Firman Prawiradisastra Heru Sri Naryanto Nana Sudiana