PEMODELAN SPASIAL LAJU EKSPOR SEDIMEN DENGAN SKENARIO VARIABILITAS CURAH HUJAN DI DAERAH ALIRAN SUNGAI PEUSANGAN, PROVINSI ACEH

• Main Author: Adi Baskoro, Alfin
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/55838
• Institution: Institut Teknologi Bandung

Rainfall affects the environmental interaction of watersheds and coastal areas. The high intensity of rain and water runoff will lift and carry particles in the watershed environment in the erosion process that causes the dynamics of the watershed and coastal environment. This study estimated the total exports of sediment in peusangan watershed in the period 1995, 2005, 2015, and 2018 with rainfall variability scenario. The estimation is based on the calculation of erosion rate and sediment delivery ratio (SDR). Erosion rate modeling uses Revised Universal Soil Loss Equation soil loss equation that takes into account climate factors (erosivity of rainfall), soil (soil erodiability), topography (length and slope), land cover, and land use practices. While SDR is calculated based on its function as a watershed area that provides homogeneous values for the entire pixel modeling area. This results in the value of sediment export rate will be proportional to the value of erosion rate so to see the relationship between rainfall variability to sediment export rate can be by correlate precipitation variability to changes in erosion rate. Assuming the period of 1995 as a baseline against another period will result in a very strong correlation between the two with a correlation coefficient value of one. In general, the rate of erosion in peusangan watersheds falls into the light category based on the classification of erosion hazard levels according to the Ministry of Forestry in 1998. Based on the estimated rate of erosion and SDR, the total annual number of sediment exports in the Peusangan watershed in 1995 amounted to 1,066,027,426 tons, in 2005 amounted to 909,914,623 tons, in 2015 amounted to 1,075,759,133 tons, and in 2018 amounted to 1,085,490,841 tons. Based on spatial distribution of sediment export rate, in general peusangan watershed falls into the category of normal erosion.