Publikasi Penelitian

Comparison of Soil Loss from Prediction Using Universal Soil Loss Equation with Direct Measurement from Sediment Yield in Keduang Sub-Watershed


Abstrak (Indonesia):
Abstract (English) :
Spatial information of soil erosion is useful to determine suitable soil conservation practices in a watershed. Universal Soil Loss Equation (USLE) is a common method to predict soil erosion. The accuracy of prediction is depend on the required variables. Therefore, the purpose of this research is to compare soil erosion from prediction by USLE using three types formula of rainfall erosivity with direct measurement from sediment yield. The study was conducted in Keduang Sub-Watershed which is the highest sediment contributor for Gajah Mungkur reservoir. The field data collection was undertaken in 2013. To predict soil loss using USLE, the slope was derived from ASTER and land cover from Landsat 7 ETM+ images. Tree methods for estimating rainfall erosivity were applied. The three methods are Utomo and Mahmud, Utomo, and Bols equations The USLE was applied for every land unit. The direct measurement was by taking suspended sediment in the outlet of the sub-watershed. By considering sediment delivery ratio, the sediment within the water samples was converted into soil erosion. The results showed that the dominant landcover is dryland cultivation area (87%). The slope between 15 to 45% covers 37% of the watershed. The predicted soil erosion by formula of Utomo and Mahmud is 53.9 ton/ha/year, which is the closer to the field measurement in 2013 (50.1 ton/ha/year). When Utomo’s formula was applied, it predicts soil loss 41.3 ton/ha/year, while formula of Bols produces soil loss around 99 ton/ha/year.
Media Publikasi :
Proceedings of International Conference of Indonesia Forestry Researchers III-2015
Penulis :
Tyas Mutiara Basuki, Dr., Ir., M.Sc., Wahyu Wisnu Wijaya, S.Hut.

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