Pengaruh Reboisasi Pada Program GNKPA Tahun 2011 Terhadap Erosi Lahan Di DAS Keduang

Trimariat, Fathoro and , Ir. Sri Sunarjono, M.T., Ph.D and , Ir. Achmad Karim Fatchan, MT (2016) Pengaruh Reboisasi Pada Program GNKPA Tahun 2011 Terhadap Erosi Lahan Di DAS Keduang. Thesis thesis, Universitas Muhammadiyah Surakarta.

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Abstract

DAS Keduang is a sub-watershed of the Wonogiri Dam catchment area. Keduang DAS is the largest supplier of sediment into the Wonogiri Dam compared with other sub-basins in the watershed entering the Wonogiri reservoir. Balai Besar Wilayah Sungai Bengawan Solo conducted reforestation program in Keduang watershed through Gerakan Nasional Kemitraan Penyelamatan Air (GNKPA) in 2011. The event aimed to minimize the impact of increasing sedimentation. The influence of the eforestation results is still uncertain. This research evaluates and analyzes quantity impacts resulting from reforestation in Keduang watershed. this research applied USLE method to analyze the soil erosion. Factors affecting soil erosion in USLE methods include: rainfall erosivity, soil erodibility, length and slope gradient factor, the factor of land cover crops and conservation practical factors. This research analyze the soil erosion quantity on existing condition as well as predicted the quantity after 5, 10, an 15 years of reforestation. Arcview and Microsoft Excel were applied as tools for calculation using USLE method. The result of USLE method analysis shows that soil erosion on existing condition is 174.955 ton/ha/year, where as the predicted quantity after 5, 10 and 15 years are espectively 143.195 ton/ha/year, 127.323 ton/ha/year, and 111.450 ton/ha/year. The quantity of soil erosion has decreased every year. This decline is due to the value of C (factor of land cover) changes (decreases). With the reforestation and tree planting, which was originally sparse vegetation cover is untight or even open to betight, so that the potential of eroded soil to be small. Calculation of soil erosion prediction after 15 years with USLE method, acquired large land erosion at the study site of 111.450 ton/ha/year. Large land erosion is still exceeded the maximum rate of erosion, where the maximum limit according to Morgan (1980) in areas with tropical erodible land is 25 ton/ha/year. This is due to the research only consider the change in factor C, and areas which carried out reforestation program was limited in few villages.

Item Type:	Karya ilmiah (Thesis)
Uncontrolled Keywords:	DAS, Erosi Lahan, Reboisasi, Sedimentasi, USLE
Subjects:	T Technology > TD Environmental technology. Sanitary engineering
Divisions:	Fakultas Pasca Sarjana > Magister Teknik Sipil
Depositing User:	Unnamed user with username s100110029
Date Deposited:	05 Nov 2016 05:07
Last Modified:	12 Dec 2018 02:29
URI:	http://eprints.ums.ac.id/id/eprint/47796

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