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PENDUGAAN INFILTRASI MENGGUNAKAN DATA NERACA AIR DI SUB DAERAH ALIRAN SUNGAI WATUJALI, GOMBONG (Estimation of infiltration based on water balance method at Watujali Sub Watershed, Gombong) Irfan Budi Pramono; Rahardyan Nugroho Adi
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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (836.732 KB) | DOI: 10.20886/jppdas.2017.1.1.35-48

Abstract

Infiltration rate in a watershed is very important for water management. There are many methods for estimating the rate of infiltration in a watershed. Among of them are direct measurements, hydrograph analysis and water balance calculation. The purpose of this study was to estimate infiltration in the sub watershed  under pine forest. The method was based on a relationship between water balance and regression of monthly rainfall and discharge. The results showed that the infiltration rate of pine forest in Watujali Sub Watershed  range from 125 mm/year up to 1,193 mm/year. The infiltration rate was highly depended on rainfall as the input. In  2010 with 5,826 mm rainfall, the infiltration rate reached 1,193 mm/year. Estimation of infiltration using water balance data was easy to implement because it only used data of streamflow, rainfall and evapotranspiration.
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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1235.724 KB) | DOI: 10.20886/jppdas.2018.2.2.173-187

Abstract

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
Temporal distribution of sediment yield from catchments covered by different pine plantation areas Tyas Mutiara Basuki; Irfan Budi Pramono; Rahardyan Nugroho Adi; Esa Bagus Nugrahanto; Diah Auliyani; Wahyu Wisnu Wijaya
Journal of Degraded and Mining Lands Management Vol 5, No 3 (2018)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1047.532 KB) | DOI: 10.15243/jdmlm.2018.053.1259

Abstract

Soil erosion and sedimentation are environmental problems faced by tropical countries. Many researches on soil erosion-sedimentation have been conducted with various results. Quantifying soil erosion-sedimentation and its temporal distribution are important for watershed management. Therefore, a study with the objective to quantify the amount of suspended sediment from catchments under various pine plantation areas was conducted. The research was undertaken during 2010 to 2017 in seven catchments with various percentage of pine coverage in Kebumen Regency, Central Java Province. The rainfall data were collected from two rainfall stations. A tide gauge was installed at the outlet of each catchment to monitor stream water level. The water samples for every stream water level increment were analyzed to obtain sediment concentration. The results showed that monthly suspended sediment of the catchments was high in January to April and October to December, and low in May to September. The annual suspended sediment fluctuated during the study period. Non-linear correlations were observed between suspended sediment and rainfall as well as suspended sediment and percentage pine areas. The line trend between suspended sediment and percentage of pine areas showed that the increase in pine areas decreased suspended sediment, with the slope of the graph is sharp at the percentage of pine areas from 8% to 40%, then is gentle for pine plantation areas more than 40%.
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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1036.492 KB) | DOI: 10.20886/jppdas.2018.2.2.89-110

Abstract

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