ANALISA LAJU EROSI DAN ARAHAN KONSERVASI LAHAN BERBASIS ARCGIS PADA DAS PARANGJOHO KABUPATEN WONOGIRI JAWA TENGAH

Syarif Tuhepaly, Firman (2021) ANALISA LAJU EROSI DAN ARAHAN KONSERVASI LAHAN BERBASIS ARCGIS PADA DAS PARANGJOHO KABUPATEN WONOGIRI JAWA TENGAH. Sarjana thesis, Universitas Brawijaya.

Abstract

Waduk Parangjoho yang berlokasi di Desa demesan Kecamatan eromoko Wonogiri Jawa Tengah ini merupakan waduk multiguna yang berfungsi sebagai irigasi. Studi ini bertujuan untuk mencari nilai laju erosi dan sedimen beserta tingkat bahaya erosi pada DAS Waduk Parangjoho. Dari penelitian ini juga akan menghasilkan konservasi lahan untuk dapat diterapkan pada lokasi studi. Dalam penelitian ini, untuk menentukan nilai laju erosi menggunakan metode USLE. Penulis menggunakan data jumlah hujan bulanan, data jumlah hari hujan, data hujan harian maksimum untuk menentukan nilai R, kemudian data jenis tanah untuk menentukan nilai K, data kemiringan lereng untuk menentukan nilai LS, data koefisien CP untuk menentukan tata guna lahan, Perhitungan menggunakan metode USLE diperoleh nilai laju erosi rata-rata sebesar 62,322 ton/ha/tahun. Hasil analisis tingkat bahaya erosi diperoleh di sangat ringan sejumlah 30,63%, ringan 42%, sedang 19,74%, berat 6,27%, dan sangat berat 1,5%. Berdasarkan perhitungan Sediment delivery ratio (SDR), didapatkan hasil perkiraan sedimen sebesar 42.832 ton/tahun. Studi ini tidak hanya menjelaskan erosi di lahan seja tetapi juga estimasi endapan sedimen di Waduk. Hasil estimasi sedimen di Waduk 39.254 m3/tahun maka waktu pengendapan dari berbagai elevasi dikomulatifkan didapatkan usia guna waduk 32 tahun. Setelah itu dilakukan penanganan Konservasi lahan dilakukan dengan 2 metode yaitu metode vegetatif dan metode mekanis. Dimana metode vegetatif dilakukan dengan penanaman tanaman musiman dan tanaman tahunan, Sedangkan untuk metode mekanis dilakukan dengan cara pengendalian sedimen dengan perhitungan checkdam eksisting. Hasil konservasi lahan tersebut dapat dilakukan secara optimal karena dapat mengurangi laju erosi dan tingkat bahaya erosi.

English Abstract

Parangjoho Reservoir, located in Demesan Village, Eromoko District, Wonogiri, Central Java, is a multipurpose reservoir that functions as irrigation. This study aims to find the value of the rate of erosion and sediment along with the level of erosion hazard in the Parangjoho Reservoir watershed. This research will also result in land conservation to be applied to the study site. In this study, to determine the value of the erosion rate using the USLE method. The author uses data on the amount of monthly rain, data on the number of rainy days, maximum daily rainfall data to determine the R value, then soil type data to determine the K value, slope data to determine the LS value, CP coefficient data to determine land use. USLE obtained an average erosion rate of 62,322 tons/ha/year. The results of the analysis of the level of erosion hazard are obtained by looking at the distribution of the value of the Erosion Hazard Level based on the soil solum data which is then determined by the classification table of the Erosion Hazard Level with the results of the TBE value at very light 30.63%, mild 42%, moderate 19.74%, heavy 6.27%, and very heavy 1.5%. Then after calculating the TBE value, the criticality value of the land is obtained with conditions where the TBE value with severe conditions is included in a critical condition. The critical condition of the land is very useful for determining the steps for land conservation scenarios to find out what steps will be used to overcome the erosion problem. Based on the calculation of the Sediment delivery ratio (SDR), the estimated sediment yield is 42,832 tons/year. This study not only explains the erosion on the land but also the estimation of sediment deposition in the reservoir. Because the sediment in the land does not necessarily enter the reservoir, an analysis must be carried out to estimate the sediment deposition that occurs in the reservoir. By using the Brune method, it is possible to estimate deposition in the reservoir. The results of the estimated sediment in the reservoir are 39,254 m3/year, the time of deposition from various elevations is cumulative, the reservoir age is 32 years. After that, land conservation is handled. In this study to overcome the problem of erosion carried out by 2 methods of land conservation scenarios, namely the vegetative method and the mechanical method. Where the vegetative method is carried out by planting seasonal and annual plants, while the mechanical method is carried out by controlling sediment by calculating the existing checkdam. The results of land conservation can be carried out optimally because it can reduce the rate of erosion and the level of erosion hazard.

Other obstract

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Item Type:	Thesis (Sarjana)
Identification Number:	627.52
Uncontrolled Keywords:	USLE, tingkat bahaya erosi, sedimen, konservasi lahan, erosion, USLE, erosion hazard, sediment, land conservation.
Subjects:	600 Technology (Applied sciences) > 627 Hydraulic engineering > 627.5 Reclamations, Irrigation, related topics > 627.52 Irrigation
Divisions:	Fakultas Teknik > Teknik Pengairan
Depositing User:	Unnamed user with email gaby
Date Deposited:	23 Oct 2021 09:01
Last Modified:	16 Oct 2024 01:50
URI:	http://repository.ub.ac.id/id/eprint/185513

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