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GROUNDWATER VULNERABILITY TO POLLUTION IN KASIHAN DISTRICT, BANTUL REGENCY, INDONESIA Purnama, Setyawan; Cahyadi, Ahmad
Forum Geografi Vol 33, No 2 (2019): December 2019
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v33i2.7672

Abstract

The groundwater vulnerability to pollution refers to the ease of pollutants reaching groundwater, so the groundwater will be polluted. The concept shows a probability that pollution will occured which basically bases on the assumption that the physical environment can prevent the flow of pollutants into the aquifer. The purpose of this study was to predict the vulnerability of groundwater in the study area against pollution. To achieve these objectives beside base on secondary data, also measured the depth of phreatic surface, slope and groundwater sampling. Location of measurement and sampling is determinated by considering location of infiltration measurement ever done by Purnama in 2017. To conduct groundwater vulnerability analysis on pollution in the study area, carried out by SINTACS Method which bases on a numerical system of weight and rating. Weight are determined based on the significance of the effect of the parameters on groundwater pollution, while the rating is determined based on the significance of the influence of variables in each parameters against groundwater pollution. As a result, it is known that groundwater vulnerability indeks in research area range from 117,0 to 189,9. According to criteria of SINTACS, the value are classified as moderate vulnerability and rather high vulnerability. Areas that include moderate levels of vulnerability generally located in Sentolo Formations that consist of limestone and has grumusol soil type. Areas that classified as rather high vulnerability is located in Yogyakarta Formation that consist of volcanic rock and has regosol soil type. Based on this phenomena, it can be said that geological aspect and type of soil greatly affect the vulnerability of groundwater to pollution in the research area.
PENGGUNAAN MODEL DINAMIK DALAM PENENTUAN PRIORITAS KONSERVASI AIR TANAH DI KABUPATEN BANTUL = Dynamic Model Application to Determine Ground Water Conservation Priorities in Bantul District Purnama, Setyawan
Jurnal Teknologi Lingkungan Vol. 14 No. 2 (2013)
Publisher : Center for Environmental Technology - Agency for Assessment and Application of Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (865.277 KB) | DOI: 10.29122/jtl.v14i2.1430

Abstract

Recently, problem related to water resources, especially groundwater is more complex. Basically there are three problems related to groundwater resources i.e. quantity, quality and its distribution (spatially or temporary). Conservation is needed to be done to keep its sustainability. Base on this background, the objectives of the research is (1) to build groundwater conservation model, (2) to analyse theperfomance of model in various physical and social-economic condition and (3) to determine policy priority of groundwater resources conservation. Calculation of groundwater availability, safe yield,and its usage for domestic, industry, hotels and poultry are carried out to achieve these objectives. Powersim 2,5c. programme is used as model simulation. As a result, it is known that dynamic modelwith Powersim 2,5c. programme can be used to do hydrologic simulation models, especially in groundwater conservation models. Base on model behavior simulation, it is known that decreasing ofland conversion to settlement can be preserved decreasing of groundwater recharge and decreasing of groundwater storage significantly. Moreover, because of its hydrologic system, the decreasing of land conservation do not just be done in Bantul District, but also in Sleman and Jogjakarta City. Besides decreasing of land conversion, the policy that can be done to conservate groundwater is by decreasing water consumption. Keywords : dynamic models, groundwater conservation, Bantul DistrictAbstrakSaat ini, permasalahan yang berkaitan dengan sumberdaya air, khususnya sumberdaya air tanah semakin kompleks. Pada dasarnya ada tiga masalah dalam kaitannya dengan sumberdaya ini,yaitu masalah kuantitas, kualitas dan masalah distribusi, baik secara keruangan maupun waktu. Upaya konservasi perlu sedini mungkin dilakukan terhadap keberadaan sumberdaya ini agar keberlanjutannya dapat terjaga. Tujuan dari penelitian ini adalah (1) membuat model konservasi air tanah di daerah penelitian. (2) mengetahui perilaku model pada berbagai kondisi fisik dan sosial ekonomi dan (3) merumuskan prioritas kebijakan konservasi sumberdaya air tanah di daerah penelitian yang sesuai dengan karakteristik daerah. Untuk mencapai tujuan ini dilakukan perhitungan ketersediaan air tanah dan hasil aman dengan metode statik dan perhitungan kebutuhan air untukkeperluan domestik, industri, perhotelan dan peternakan. Untuk melakukan simulasi pemodelan digunakan Program Powersim 2,5c. Hasil penelitian menunjukkan bahwa model dinamik denganmenggunakan Program Powersim 2,5c dapat digunakan untuk melakukan simulasi model hidrologi, khususnya model konservasi air tanah. Berdasarkan hasil simulasi model, diketahui bahwa denganmengurangi laju konversi lahan menjadi permukiman, dapat mempertahankan pengurangan imbuh air tanah dan mengurangi laju pengurangan jumlah air tanah tersimpan secara signifikan.Pengurangan laju konversi lahan bukan hanya dilakukan di wilayah Kabupaten Bantul, namun dilakukan secara terpadu untuk seluruh Sistem Akuifer Merapi yang juga meliputi Kabupaten Slemandan Kota Yogyakarta. Selain dengan mengurangi konversi lahan, kebijakan yang dapat dilakukan dalam konservasi air tanah di Kabupaten Bantul, adalah dengan gerakan hemat air.Kata kunci : model dinamik, konservasi air tanah, Kabupaten Bantul
POTENSI SUMBERDAYA AIR DAS SERAYU Purnama, Setyawan
Jurnal Rekayasa Lingkungan Vol 6, No 3: Jurnal Rekayasa Lingkungan
Publisher : BPPT

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (313.039 KB)

Abstract

Serayu River Basin is one of critical river basin in Java. This problems become seriously because the river basin cover wide area, that almost cover most of the south of Central Java Province. This research is aimed to calculate and analyse the resources potency of rainfall, river, groundwater and springs. Rainfall potency is calculated by isohyetal method, river potency is determined base onhydograph dan water level data. Groundwater and springs is determined qualitatifly base on Hydrogeological Map, whereas quantitatifly is calculated by meteorogical method base on water balance concept in river basin. As a result, show that the average rainfall in Serayu River Basin is 3,577 m3/year, whereasthe rainfall potency is 13,481.00 x 106 m3/year. The average of monthly maximum discharge in Serayu is 60 m3/second, with monthly minimum discharge 11 m3/second. Meteorologically, groundwater storage in Serayu River Basin is 105,981,890 m3/year. Beside that, in Serayu River Basin also have 93 springs, that is 10 springs with discharge more than 500 litre/second, 15 springs with discharge 50-100 litre/second, 20 springs with discharge 10-50 litre/second and 24 springs with discharge less than 10 litre/second.Keywords : Water resources potency, Serayu River Basin
Analisis Karakteristik Fisik dan Meteorologi DAS Bengkulu Gita Ivana Suci Lestari Faski
Megasains Vol 12 No 2 (2021): Megasains Vol.12 No.2 Tahun 2021
Publisher : Stasiun Pemantau Atmosfer Global Bukit Kototabang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (842.902 KB) | DOI: 10.46824/megasains.v12i2.69

Abstract

Bengkulu watershed experiences flooding at least two times a year during the rainy season. The flood is one of the hydrometeorological disasters influenced by the physical and meteorological characteristics of the watershed. The characteristics are the basis for planning and management in the watershed. Therefore, this study aims to analyze the physical characteristics and meteorological characteristics of the Bengkulu watershed, as a basis for planning and managing the watershed, to minimize the incidence and impact of hydrometeorological disasters in the watershed. The method used in this research is a quantitative descriptive method of the physical and meteorological characteristics of the Bengkulu watershed. The physical characteristics of the watershed that were analyzed were morphometry, topography, soil type, and land use in the Bengkulu watershed. While the meteorological characteristics analyzed were rainfall and air temperature in the Bengkulu watershed. The results show that the physical characteristics of the Bengkulu watershed have a low capacity to store water, so that the infiltration is small, but the runoff rate is small and the flow type is moderate. However, runoff tends to increase. This is due to decreasing changes in forest land use, supported by increasing rainfall, and small variations in air temperature.
ANALISIS KERENTANAN DAN KUALITAS AIRTANAH BEBAS DI KOTA MATARAM (Analysis of Vulnerability and Quality of Unconfined Groundwater in The City of Mataram) La Musa; Ig. I. Setiawan Purnama; Slamet Suprayogi
Jurnal Sains Informasi Geografi Vol 2, No 1 (2019): Edisi Mei
Publisher : Universitas Muhammadiyah Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31314/jsig.v2i1.223

Abstract

Kerentanan airtanah merupakan suatu kondisi yang menggambarkan mudahnya zat pencemar dalam mempengaruhi airtanah. beberapa faktor yang mempengaruhi terjadinya kerentanan airtanah bebas diantaranya kedalaman muka airtanah, jenis akuifer dan jenis litologi diatas akuifer. Kelas mutu air merupakan peringkat kualitas air yang di nilai masih layak untuk dimanfaatkan berdasarkan hasil uji parameter kualitas air. Penelitian ini bertujuan untuk 1). Menganalisis persebaran dan tingkat kerentanan airtanah bebas terhadap pencemaran dengan menggunakan metode GOD di Kota Mataram.2). Menganalisis kualitas airtanah bebas menurut parameter fisika, kimia dan biologi di Kota Mataram. Hasil penelitian menunjukan bahwa airtanah bebas di Kota Mataram memiliki potensi kerentanan sedang terhadap pencemaran, berdasarkan hasil uji laboratorium sampel airtanah, ditemukan beberapa sampel yang telah melampaui batas maksimum seperti 1). .Daya Hantar Listrik terdapat pada sampel 1, sampel 3, sampel 4, sampel 14 dan sampel 16 yang terletak di Kelurahan Ampenan Utara, Keluran Dayan Peken, dan kelurahan Ampenan Tengah. 2). Total dissolved solid (TDS) yang terdapat pada hamper seluruh sampel, kecuali sampel 13.3). Bakteri Colliform yang terdapat pada sampel 3, sampel 4, sampel 9, sampel 15, sampel 24 dan sampel 33. Kata Kunci : Kerentanan airtanah bebas, Metode GOD, Kualitas airtanah bebas
Kajian kualitas air dan strategi pengelolaan Rawa Jombor, Klaten, Jawa Tengah Rina, Timotius Ragga; Purnama, Setyawan; Nugroho, Andhika Puspito
Jurnal Teknosains Vol 13, No 1 (2023): December
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.55560

Abstract

Rawa Jombor is a semiartificial reservoir whose contruction are works for serving the needs of irrigation in the dry season and as a floading control in the rainy season. Rawa Jombor also used for fish farming and floating restaurant by the community. The existence of the cages and floating restaurant can have a negative impact to the aquatic environment due to the disposal of waste and leftover food and metabolism that is deposited at the bottom of the water. This study aims to analyze the water quality, pollution levels and to develop a management strategy of Rawa Jombor. Water quality is measured at 9 sampling point determined by purposive sampling based on the use of Rawa Jombor. Pollution level is analized uses pollution index and the management strategy uses analytical Herarchy Process. The results show that Rawa Jombor has decreased water quality marked by several parameters that do not meet the class III of water quality standards according to Government Regulation No. 82 of 2001. Rawa Jombor is included in the category of mildly polluted in areas without activity, floating restaurant and fish cage for water allotment class I, II, III and IV with an average pollution index ranging from 1,02 to 2,886. To maintain the continuity of the Rawa Jombor, a management strategy with priority on the economic aspects is needed with the development of the Rawa Jombor for sustainable fisheries.
Climate Change Adaptation in Batang Hari, Jambi: A Case Study of Rainfed Paddy Farmers Nasution, Mulia; Purnama, Setyawan; Sekaranom, Andung Bayu
Indonesian Journal of Geography Vol 56, No 3 (2024): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijg.90325

Abstract

Batang Hari is situated as one of the central rice-producing regencies within Jambi Province. However, the agricultural sector in Batang Hari is severely impacted by climate change in the context of productivity. This study aimed to examine rainfall and temperature trends over the last 20 years (2002 to 2021), assess farmers' perceptions, and identify the current adaptation measures due to the impact of climate change on rainfed paddy fields. This study is of great importance because it employs a holistic approach, integrating quantitative data on climate trends with qualitative insights from farmers. The results showed that rainfall decreased by 20–50 mm/month, and the average temperature increased by 0.4°C in 20 years. The qualitative data on farmers' perceived impact of changes in climate variability reported an agreement with climatological data. The farmers  perceived a decrease in rainfall and a concurrent rise in temperatures. Furthermore, a delayed onset of the rainy season was noted, leading to an adjustment of their planting schedules. Certain adaptation measures to adjust to the perceived impact of changes in climate variability on their rainfed paddy fields were also implemented. These measures included crop management as well as socio-economic adaptation.  Farmers' adaptation measures included modifying crop varieties, adjusting planting seasons, adopting agricultural machinery, and diversifying income through off-farm activities. It is also important to emphasize technological based adaptation to enhance climate resilience, as well as sustainable land management practices, agroforestry initiatives, and soil conservation efforts for long-term agricultural sustainability.