A.M. Rizalihadi, B.E. Fatimah, C.L. Nazia
Land and water is one of the major natural resource which has an important role for human life. Exploitation of land in catchment areas that not correspond to its carrying capacity will cause damage. One of the effect is increassing the soil erosion. Continuous erosion will also lead to increased sediment transport in rivers that disrupt the ship navigation on estuary due sediment accumulation. At present, soil erosion is estimated using USLE method, which is only limited to the erosion in the form of sheet erosion. The purpose of this study is to determine the influence of rill density on soil erosion compared to USLE-soil erosion mtethod. The research was conducted at the Hidrotechnics Laboratory, Civil Engineering Department, Syiah Kuala University, using test plots with size: length 150 cm, width 80 cm and 20 cm, planted with elephant grass (Penisetum purpureum) and adjusted land slope of 0o, 10o and 20o. The artificial rain is produced using a rainfall simulator with intensity of 8, 10 and 12 mm per minutes, and rill density of 0, 1, 2 and 3 m/m2. The results is tested by Anova and t distribution at 5% confidence level to see the effect of rill density on the soil erosion. Results showed that the soil erosion will increase when rill density is increased. If compared to USLE estimation, the soil erosion increase 4-14 times due to the presence of rill. Based on statistical tests on regression models obtained F = 110.052 > F (0.05; 32; 4) = 5.739, and t = 3.942 > t (0.05; 4) = 2.777, indicating the real effect of the presence of rill density. It is recommended that the rill density coefficient is necessarily considered when estimating erosion using USLE method. © APAC 2013.All rights reserved.
Civil Eng. Department, Syiah Kuala University, Jl. Tgk Syech Abdul Rauf No. 7, Darussalam-Banda Aceh, 23111, Indonesia; Graduate. Prog., Civil Eng..Magt., Syiah Kuala Univ., Jl. Tgk Syech Abdul Rauf No. 7, Darussalam-B. Aceh, 23111, Indonesia
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