Rainfall erosivity assessment over a flooding basin, Kelani River basin, Sri Lanka-Reference-Cited by-同舟云学术

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

Published:2024-05-23 Issue:6 Volume:26 Page:1454-1470
ISSN:1464-7141
Container-title:Journal of Hydroinformatics
language:en
Short-container-title:

Author:

Niyas Zumry¹,Madhushani Charuni I.¹,Gunathilake Miyuru B.²³,Basnayaka Vindhya⁴,Kantamaneni Komali⁵,Rathnayake Upaka⁶^ORCID

Affiliation:

1. a Water Resources Management and Soft Computing Research Laboratory, Athurugiriya 10150, Sri Lanka

2. b Hydrology and Aquatic Environment, Environment and Natural Resources, Norwegian Institute of Bioeconomy and Research Ås, 1433, Norway

3. c Water, Energy, and Environmental Engineering Research Unit, Faculty of Technology, University of Oulu, P.O. Box 8000, Oulu FI-90014, Finland

4. d Department of Water Engineering and Management, University of Twente, 7522 NB Enschede, The Netherlands

5. e School of Engineering, University of Central Lancashire, Preston PR1 2HE, United Kingdom

6. f Department of Civil Engineering and Construction, Faculty of Engineering and Design, Atlantic Technological University, Sligo F91 YW50, Ireland

Abstract

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.

Publisher

IWA Publishing

Link

https://iwaponline.com/jh/article-pdf/26/6/1454/1443130/jh0261454.pdf

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