Rainfall erosivity assessment over a flooding basin, Kelani River basin, Sri Lanka

IF 4.7 Q2 MATERIALS SCIENCE, BIOMATERIALS ACS Applied Bio Materials Pub Date : 2024-05-23 DOI:10.2166/hydro.2024.202

Zumry Niyas, Charuni Madhushani, M. Gunathilake, Vindhya Basnayaka, Komali Kantamaneni, Upaka S. Rathnayake

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Abstract

This study evaluates the rainfall erosivity (RE) and erosivity density (ED) over the Kelani River basin, Sri Lanka for a period of 31 years (1990–2020). The river basin is well known for its annual floods during the southwestern monsoon season and severe erosion including landslides can be observed. The catchment was analyzed for its RE using the Wischmeier and Smith algorithm and for its ED using Kinnel's algorithm. The monthly rainfall data spreading over the river basin were used to analyze the monthly, seasonal, and annual RE and ED. Interestingly, the annual RE showed a linear increasing trend line over 31 years, and a maximum value of 2,831.41 MJ mm ha−1 h−1 yr−1 was able to be observed in the year 2016. The RE peaks in May which is in the southwestern monsoon season. This reveals that the risk of soil erosion in the basin is high in the southwestern monsoon season. In addition, land use and land cover changes over the years have adversely impacted the erosion rates. Therefore, it is highly recommended to investigate soil erosion in-depth and then implement relevant regulations to conserve the soil layers upstream of the river basin.

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斯里兰卡凯拉尼河流域洪水流域降雨侵蚀性评估

本研究评估了斯里兰卡凯拉尼河流域 31 年间（1990-2020 年）的降雨侵蚀率（RE）和侵蚀密度（ED）。众所周知，该流域每年在西南季风季节都会发生洪水，并出现严重的侵蚀现象，包括山体滑坡。该流域的 RE 分析采用 Wischmeier 和 Smith 算法，ED 分析采用 Kinnel 算法。利用遍布流域的月降雨量数据分析了月度、季节和年度 RE 和 ED。有趣的是，年可再生能源在 31 年中呈现线性增长趋势线，在 2016 年观测到最大值 2,831.41 MJ mm ha-1 h-1 yr-1。每年 RE 的峰值出现在西南季风季节的 5 月份。这表明该流域在西南季风季节的水土流失风险较高。此外，多年来土地利用和土地覆盖的变化也对水土流失率产生了不利影响。因此，强烈建议对水土流失进行深入调查，然后实施相关法规，以保护流域上游的土壤层。

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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来源期刊

ACS Applied Bio Materials Chemistry-Chemistry (all)

CiteScore

9.40

自引率

2.10%

发文量

464

期刊介绍： ACS Applied Bio Materials is an interdisciplinary journal publishing original research covering all aspects of biomaterials and biointerfaces including and beyond the traditional biosensing, biomedical and therapeutic applications. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrates knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important bio applications. The journal is specifically interested in work that addresses the relationship between structure and function and assesses the stability and degradation of materials under relevant environmental and biological conditions.