SAIFUDIN, Imam and SURIPIN, Suripin and SUHARYANTO, Suharyanto (2017) KAJIAN RESPON PERUBAHAN PENGGUNAAN LAHAN TERHADAP KARAKTERISTIK HIDROLOGI DAS GARANG. Masters thesis, Postgraduate Program .
![]()
| PDF 99Kb | |
![]()
| PDF 393Kb | |
![]()
| PDF 638Kb | |
![]()
| PDF 389Kb | |
![]()
| PDF 557Kb | |
![]() | PDF Restricted to Repository staff only 3325Kb | |
![]()
| PDF 87Kb | |
![]()
| PDF 423Kb |
Abstract
Pengurangan areal hutan dan peningkatan areal terbangun menyebabkan meningkatnya koefisien limpasan yang pada akhirnya berakibat meningkatnya debit aliran sungai pada musim penghujan dan kekeringan pada musim kemarau. Model ekohidrologi dapat membantu memahami fenomena tersebut. Tujuan penelitian ini adalah untuk memprediksi perubahan karakteristik hidrologi DAS Garang dengan menggunakan model SWAT, mengetahui pengaruh perubahan penggunaan lahan terhadap perubahan karakteristik hidrologi; dan untuk menyusun rekomendasi perencanaan penggunaan lahan terbaik di DAS Garang. Data debit dan data iklim diperoleh dari instansi terkait. Kalibrasi model menggunakan 2 metode yaitu metode otomatis dengan menggunakan program SWATCUP.Sufi2 dan metode manual (trial and error). Model di kalibrasi dan divalidasi menggunakan data debit harian yang berasal dari stasiun pengamatan simongan. Model menghasilkan NSE (Nash Sutcliffe Coefficient) sebesar 0,769, R2 (R square) sebesar 0,867, dan PBIAS sebesar -7,54. Selama kalibrasi, dan NSE, sebesar 0,755; R2 sebesar 0,755 dan PBIAS 0,34 selama validasi. Hasil penelitian ini menunjukkan bahwa Karakteristik hidrologi DAS Garang tahun 2013 menunjukkan aliran permukaan sebesar 1711,49 mm, dengan aliran dasar sebesar 638,68 mm, denga nilai koefisien aliran dan koefisien regim aliran masing-masing sebesar 0,55 dan 23,04. Perubahan penggunaan lahan 2000 dan 2013 berpengaruh terhadap karakteristik hidrologi yaitu dengan peningkatan aliran permukaan sebesar 301,88 mm (14,64%) dan nilai koefisien aliran menjadi 0,55. Penggunaan lahan yang direkomendasikan berupa penerapan agroteknologi dengan tindakan teknik pengelolaan lahan pergiliran tanaman sesuai kontur dan kombinasi dengan teras. Kata kunci : Model SWAT, DAS Garang, koefisien aliran, koefisien regim aliran Depleting forest and the increase of build-up area make run off coeficien increase. Those also will increase stream flow at rainy season, but will decrease at dry season. SWAT (Soil and Water Assessment Tools) as one of ecohydrologi models will help us to analyze that phenomenon. The objectives of this study were to predict hydrological characteristics changes at Garang watershed, to know the impact of land use changes to hydrological characteristics and to know the best land use planning Garang watershed. Observation data were obtained from appropriate institution such as stream flow and climate data. The calibration used SWATCUP. Sufi2 and manual (Trial and error) methods. The methods resulted 13 parameters for calibration. The model was calibrated and validated by using the average daily data from AWRL Simongan. The models yielded NSE (Nash Sutcliffe Coefficient) was 0,769, coefficient of determination R2 (R-square) was 0,867, PBIAS was -7,54 during calibration and NSE was 0,755, R2 was 0,755 and PBIAS was 0,34 during validation. These results of this study indicated that the hydrological characteristics of Garang watershed were surface run off by 1711,49 mm, with base flow (638,68 mm), coefficient run off (0,55) and regime coefficients (23,04). The change of land use from 2000 – 2013 increased surface run off abaout 301,88 mm (14,64%) and run off coefficient became 0,55. The recommendation of this study is to apply agrotecnology such as crop rotation associates with contour and terrace combinations. Kaywords : SWAT model, Garang watershed, runoff coefficient, coefficient of flow regime
Item Type: | Thesis (Masters) |
---|---|
Subjects: | T Technology > TD Environmental technology. Sanitary engineering |
Divisions: | School of Postgraduate (mixed) > Master Program in Environmental Science |
ID Code: | 55640 |
Deposited By: | INVALID USER |
Deposited On: | 28 Aug 2017 15:03 |
Last Modified: | 28 Aug 2017 15:03 |
Repository Staff Only: item control page