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PENGARUH PERSENTASE PENUTUPAN HUTAN TERHADAP DEBIT PUNCAK DI SUB DAERAH ALIRAN SUNGAI HUTAN ALAM KABUPATEN TANAH LAUT (The effect of forest coverage percentage on peak discharge in the natural forest sub watershed, Tanah Laut Regency) Esa Bagus Nugrahanto; Rahardyan Nugroho Adi; Agung Budi Supangat; Nunung Puji Nugroho
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 (591.286 KB) | DOI: 10.20886/jppdas.2018.2.2.123-136

Abstract

ABSTRACTThe percentage of forest coverage holds an important role in regulating water in watersheds. This paper studies the influence of forest coverage percentage on peak discharge in sub watersheds with various percentage of natural forest areas. The study took place in Bakar, Tanjung, Iwakan, and Langsat Sub Watersheds, Tanah Laut Regency, South Kalimantan Province in 2017. The percentage of natural forest varied from 9,7 to 98% of the the sub watershed areas. This research was conducted by direct measurement of rainfall and stream water levels that were converted into peak discharge. The peak discharges between sub watersheds were compared to the rainfall and the percentage of forest. The results showed that in general the percentage of natural forest coverage affect the peak discharge. The forest coverage showed a positive response in lowering the peak discharge when the rainfall was below 115 mm/day. Bakar and Tanjung Sub Watersheds that had low percentage of natural forest coverage had higher peak discharge than Langsat and Iwakan Sub Watersheds, which had higher percentage of forest coverage. The relationship between the percentages of natural forest coverage with peak discharge marked by the coefficient of determination value of 53.3%. Since the existence of forest is very important as the hydrological controller, forest conservation efforts and reforestation should be conducted in the upper sub watersheds.Keywords: peak discharge; natural forest coverage; rainfall; sub watershedsABSTRAKPersentase penutupan hutan memegang peran penting dalam mengatur tata air Daerah Aliran Sungai (DAS). Hutan dengan fungsi hidrologisnya berpengaruh terhadap debit sungai. Penelitian ini bertujuan untuk mempelajari pengaruh persentase penutupan hutan terhadap debit puncak di sub DAS hutan alam. Penelitian ini dilakukan pada tahun 2017 di Sub DAS Bakar, Sub DAS Tanjung, Sub DAS Iwakan, dan Sub DAS Langsat, Kabupaten Tanah Laut Provinsi Kalimantan Selatan. Persentase hutan alam bervariasi dari 9,7 sampai 98% dari uas sub DAS. Penelitian dilakukan dengan pengkuran langsung data curah hujan dan tinggi muka air (TMA) yang dikonversi menjadi debit puncak. Data debit puncak antar sub DAS dibandingkan menurut curah hujan dan persentase penutupan hutan alam. Hasil penelitian menunjukkan secara umum persentase penutupan hutan berpengaruh terhadap debit puncak. Penutupan hutan memberikan respon yang positif dalam menurunkan debit puncak ketika curah hujan dibawah 115 mm/hari. Sub DAS Bakar dan Tanjung yang memiliki persentase penutupan hutan alam yang rendah memiliki debit puncak yang lebih tinggi dibandingkan dengan Sub DAS Langsat dan Iwakan yang memiliki persentase penutupan hutan yang tinggi. Pengaruh persentase penutupan hutan alam terhadap debit puncak ditandai oleh koefisien determinasi sebesar 53,3%. Keberadaan hutan sangat penting sebagai pengatur hidrologi sehingga sangat penting untuk dilakukannya upaya konservasi dan penghijauan di hulu sub DAS yang diamati.Kata kunci: debit puncak; penutupan hutan alam; curah hujan; sub DAS
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%.