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Modelling soil erosion and runoff for a super typhoon event using PCRaster
Journal of Maps ( IF 2.2 ) Pub Date : 2020-11-12 , DOI: 10.1080/17445647.2020.1841037
Victorino A. Bato 1
Affiliation  

ABSTRACT

A physical model for soil erosion and runoff was created for Alimit River Sub-watershed, using PCRaster Software. Manning's equation was used to model surface runoff velocity and Rose’ and Freebairn’s Equation was used to compute for sediment concentration. Event-based rainfall, saturated hydraulic conductivity, land use map, and digital elevation model were used as input for the model. Close correspondence was observed between the measured and predicted values for both streamflow and mass of eroded sediments. It was observed that vegetation played a significant role in reducing eroded sediments and choosing the correct Manning's Roughness Coefficient for various land use/ land cover is of utmost importance. Furthermore, in the absence of soil data, land use/ land cover or NDVI (Normalized Difference Vegetation Index) can be used as basis for the hydraulic conductivity of the soil.



中文翻译:

使用PCRaster模拟超级台风事件的土壤侵蚀和径流

摘要

使用PCRaster软件为Alimit河子流域创建了土壤侵蚀和径流的物理模型。用Manning方程来模拟地表径流速度,用Rose'和Freebairn方程来计算泥沙浓度。基于事件的降雨,饱和导水率,土地利用图和数字高程模型被用作模型的输入。在流量和侵蚀沉积物质量的测量值和预测值之间观察到了密切的对应关系。据观察,植被在减少侵蚀的沉积物方面起着重要作用,对于各种土地利用/土地覆盖选择正确的曼宁粗糙度系数至关重要。此外,由于缺乏土壤数据,

更新日期:2020-12-12
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