Abstract
Erosion is a natural process that occurs naturally causing sedimentation in a stream. The transported sediment material can reduce channel capacity and increase the risk of flooding, as happened in the Big River Fishing Area, Karang Intan Subdistrict, Banjar District. Therefore it is necessary to determine the value of erosion and the latest sediment in order to be the basis of consideration of management actions. Watershed management analysis using hydrological model. Soil And Water Assessment Tool (SWAT) is one of the hydrological models that can be used to analyze erosion and sedimentation with parameters such as rainfall data, temperature, land cover, soil and slope. SWAT model simulation using land use data, soil, rainfall and climate data of 2016, the amount of sedimentation and erosion in Catchment Area of large river is 58,48 ton/ha/year and 4,82 ton/ha/year. The level of sedimency in the Catchment Area of the Great River which belongs to very low class is 1635,38 ha, low grade 57,31 ha, middle class 385,21 ha and very high class that is 3.221,48 ha. While the level of erosion that includes very light class of 2334,24 ha, lightweight 2.692.31 ha and middle class area of 272.83 ha.
Highlights
necessary to determine the value of erosion
the latest sediment in order to be the basis of consideration of management actions
The level of sedimency in the Catchment Area of the Great River which belongs to very low class is
Summary
Erosi adalah suatu proses dimana tanah dihancurkan dan kemudian dipindahkan ke tempat lain oleh kekuatan air, angin dan gravitasi (Hardjowigeno 1989). Soil and Water AssessmentTool (SWAT) merupakan salah satu model hidrologi yang dikembangkan untuk melakukan prediksi dampak dari manajemen lahan pertanianterhadap air, sedimentasi, dan jumlah bahan kimia pada suatu area DAS dengan mempertimbangkan variasi jenis tanahnya, tata guna lahan, serta kondisi manajemen suatu DAS setelah melalui periode yang lama (Neitsc et al 2005). Asdak (2004) menyatakan DAS sebagai suatu wilayah daratan yang secara topografi dibatasi oleh punggung-punggung gunung yang menampung dan menyimpan air hujan untuk kemudian menyalurkannya ke laut melalui sungai utama. SWAT membagi DAS atau sub DAS menjadi bagian-bagian yang lebih kecil yang terhubung satu sama lain oleh jaringan sungai. Simulasi proses-proses hidrologi dibagi menjadi dua komponen utama yaitu komponen daratan (pergerakan air, nutrisi, pestisida dan sedimen ke sungai) dan komponen sungai (pergerakan air di saluran ke sungai untuk kemudian menuju outlet DAS) (Fohrer et al.2005)
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