APPLICATION OF EROSION PREDICTION WITH UNIVERSAL SOIL LOSS EQUATION FROM AGRICULTURE STEEP LAND AT DESA CIBEUREUM

• Main Author: AMARU (NIM 25305012), KHARISTYA
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/8406
• Institution: Institut Teknologi Bandung

Research on erosion at a steep-sloped area has been done on agriculture land located in Kampung Cirawa, Desa Cibeureum, Kecamatan Kertasari, Kabupaten Bandung. The objective of the research is to predict erosion that is generated from a steep-sloped agriculture land using modified Universal Soil Loss Equations (USLE). The type of the soil is silty loam that consists of 1 percent gravel, 32 percent sand, 62 percent silt and 5 percent clay. The size of the plot is 29.6 meter length and 30 m width, and the slopes is between 9 and 25 degree. It had been measured that rainfall intensity 29.17 mm per hour of a single rainfall may produce erosion 5262.76 kg/ha that is considered very large. The correlation of the relationship between overland flow and erosion is 0.88. Besides, the correlation of the relationship between rainfall intensity and erosion is 0.76. Further analysis are conducted through simulations on rainfall, slope, and land cover. Simulations on rainfall for weak, normal, heavy and very heavy rain produce eroded materials of 2.03, 2.36, 115.18 and 565.32 ton per hectare respectively. Moreover, simulations on slope for slope slightly, fairly steep, steep, and very steep produce eroded materials 54.84, 106.19, 230.52 and 309.53 ton per hectare respectively. In addition, simulations on land cover by woods, mixed agricultural field, eggplant in contour and uncrop land with cultivation produce eroded materials 0.16, 31.08, 54.28 and 155.18 ton per hectare respectively. These indicate that erosion is directly under the function of rainfall intensity, slope, and land cover. The comparisons between field measurements and the calculated results based on Sum Square Error method and T-test paired show that USLE does not produce satisfactory results on predicted erosions. In other words, the equation might not be applicable for such research location. <br />