Prediksi Erosi Menggunakan Model USLE pada Kegiatan Rehabilitasi Hutan dan Lahan (RHL) di Sub-Sub DAS Cibitung dan Sub-Sub DAS Cisembung, DAS Citarum
Date
2021Author
Rahadiansyah, Muhammad Fadhil
Murtilaksono, Kukuh
Yusuf, Sri Malahayati
Metadata
Show full item recordAbstract
DAS Citarum merupakan sumberdaya air yang sangat penting bagi Provinsi
Jawa Barat, tetapi kondisinya sangat memprihatinkan akibat pencemaran dan
erosi. Penelitian ini bertujuan memprediksi erosi di Sub-Sub DAS Cibitung dan
Sub-Sub DAS Cisembung, DAS Citarum serta menyusun arahan pengelolaan
lahan berdasarkan konservasi tanah dan air. Penelitian ini dilakukan dengan
memprediksi erosi eksisting pada Sub-Sub DAS Cibitung dan Sub-Sub DAS
Cisembung, prediksi erosi dengan skenario kegiatan Rehabilitasi Hutan dan Lahan
(RHL) dan skenario arahan pengelolaan lahan sebagai skenario alternatif lain.
Hasil prediksi erosi pada kondisi eksisting di Sub-Sub DAS Cibitung sebesar
38,02 ton ha-1 tahun-1 dan di Sub-Sub DAS Cisembung sebesar 126,12 ton ha-1
tahun-1. Tolerable soil loss di Sub-Sub DAS Cibitung sebesar 29,08 ton ha-1
tahun-1 dan di Sub-Sub DAS Cisembung sebesar 19,99 ton ha-1 tahun-1. Kegiatan
RHL dari BPDASHL Citarum-Ciliwung diprediksi menurunkan erosi di Sub-Sub
DAS Cibitung sebesar 18,7% dan menurunkan erosi di Sub-Sub DAS Cisembung
sebesar 91,38%. Arahan pengelolaan lahan dari kegiatan RHL yang dimodifikasi
diprediksi dapat menurunkan erosi sebesar 31,45% di Sub-Sub DAS Cibitung dan
menurunkan erosi sebesar 86,95% di Sub-Sub DAS Cisembung. Arahan
pengelolaan lahan dengan teknik konservasi tanah dan air diprediksi dapat
menurunkan erosi sebesar 90,58% di Sub-Sub DAS Cibitung dan menurunkan
erosi sebesar 97,03% di Sub-Sub DAS Cisembung. The Citarum watershed is a very important water resource for West Java
Province, but its condition is very critical due to pollution and erosion. The
research aims were to predict the erosion in the Cibitung and Cisembung Subwatersheds
based on existing, forest and land rehabilitation condition, and to
arrange land management based on soil and water conservation. This research was
conducted by computing the prediction of existing erosion, prediction of erosion
based on forest and land rehabilitation activity and the land management as
another alternative scenario in the Cibitung and Cisembung Sub-watersheds. The
results show that the prediction of erosion in the existing conditions in the
Cibitung Sub-watershed is 38,02 tonnes ha-1 year-1 and in Cisembung Subwatersheds
is 126,12 tonnes ha-1 year-1. Tolerable soil loss in Cibitung Subwatershed
is 29,08 tons ha-1 year-1 and in Cisembung Sub-watershed is 19,99 tons
ha-1 year-1. Forest and land rehabilitation activities from BPDASHL Citarum-
Ciliwung are predicted to reduce the erosion in the Cibitung Sub-watershed by
18,7% and reduce the erosion in Cisembung Sub-watershed by 81,94%. The
direction for land management by modificated the forest and land rehabilitation
activities are predicted to reduce erosion by 31,45% in the Cibitung Subwatershed
and reduce erosion by 91,38% in the Cisembung Sub-watershed. The
direction for land management by used water and soil conservation’s technic are
predicted to reduce erosion by 90,58% in the Cibitung Sub-watershed and reduce
erosion by 97,03% in the Cisembung Sub-watershed.