CONTRIBUTION OF WATER EROSION TO COASTAL SEDIMENTARY MORPHODYNAMICS: QUANTIFICATION USING UNIVERSAL SOIL LOSS (RUSLE) IN THE KAFOUNTINE WATERSHED (SOUTHERN SENEGAL)

International Journal of Agriculture, Environment and Bioresearch Pub Date : 1900-01-01 DOI:10.35410/IJAEB.2020.5586

Dome Tine, Mbagnick Faye, M. Thior, M. Mbaye, Landing Biaye, G. Faye, Djibril Tine

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Abstract

Lower Casamance is characterized by a set of watersheds drained by permanent streams that flow directly to their mouths. Among these watersheds, we have Kafountine, which, like all others, participates in the sedimentary morphodynamics of the coastline through the water erosion that occurs especially upstream, on the slopes. The sediments transported and deposited are usually composed of fine sands forming accumulations in places that stabilize the beaches. The objective of this study is to estimate the amount of sediment eroded in the Kafountine watershed and transported to the coast. To do this, we used the Wischmeier and Smith Universal Soil Loss Equation (RUSLE) (1978), which is frequently used to calculate the average annual soil loss per unit of land resulting from slick and channel erosion. The equation is applied after the data is integrated into a Geographic Information System (GIS). The results from the overlapping of factors tell us that the Kafountine watershed is losing on average 54.5 t/ha/an.

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水侵蚀对海岸沉积形态动力学的贡献:在卡ountine流域(塞内加尔南部)使用普遍土壤流失(rusle)进行量化

下卡萨芒斯的特点是一组由直接流入河口的永久溪流排干的流域。在这些流域中，我们有卡丰蒂纳，它和所有其他流域一样，通过特别是上游斜坡上发生的水侵蚀，参与了海岸线的沉积形态动力学。运输和沉积的沉积物通常由细沙组成，在稳定海滩的地方形成堆积。本研究的目的是估计Kafountine流域侵蚀并输送到海岸的泥沙量。为此，我们使用了Wischmeier和Smith通用土壤流失方程(RUSLE)(1978)，该方程经常用于计算由浮油和渠道侵蚀引起的每单位土地的平均年土壤流失量。将数据整合到地理信息系统(GIS)后应用该方程。叠加因子的结果告诉我们，卡ountine流域平均损失54.5吨/公顷/年。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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International Journal of Agriculture, Environment and Bioresearch

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