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description Journal article public Jurnal Budidaya Pertanian

Penilaian Degradasi Lahan dan Dampak Sedimentasi terhadap Perencanaan Bangungan Air di Daerah Aliran Sungai Wai Ruhu, Kota Ambon

Calvin T. Tutuarima, Silwanus M. Talakua, Rafael M. Osok
Published 2021

Abstract

Land degradation is the reduction in the ability of land to generate benefits from certain land uses under special treatment from land management. Land degradation usually indicates deterioration in the production capacity of the land either temporarily or permanently. A further consequence of the land degradation process is the emergence of unproductive areas called critical lands. Quantitative and qualitative determination of erosion in a watershed area could be identified through observation of real damage indicators that had occurred in the field. This is based on this study results combined with the method of determining soil degradation in the field, namely the Field Assessment Tools, indicators of soil damage due to erosion obtained in the area of this this study area. These included pedestals, exposed plant roots / tree roots and exposed building foundations as an indication of land degradation due to sheet erosion, channel indicators as channel erosion and trench indicators as trench erosion. The classification of land degradation due to erosion found in the Wai Ruhu watershed showed that the level of land degradation could be classified as light erosion, moderate erosion, heavy erosion and very heavy erosion, with the range of erosion varying from 4.40 tons/ha/year to 675,62 tons/ha/year. Meanwhile, from the results of direct measurements, the overall average sediment concentration was 98,06 mg/L. During the rainy season, the average sediment concentration produced was 107,43 mg/L, higher than during the dry season of 88.69 mg/L. The Wai Ruhu watershed had a fairly large discharge. Although during the dry season the river was not dry completely, the discharge was very small. The basic material found along the Wai Ruhu watershed indicated that there had been intensive degradation processes in the upstream area. Excessive deposition along the river would result in reduced capacity of the river channel. Keywords: Ambon, discharge, land degradation, sedimentation, Wai Ruhu Watershed  

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