CSBE-SCGAB

Development and evaluation of modified distributed CN-VSA method for estimation of spatial distribution of Variable Source Areas.

Authors: Panjabi, K., R. Rudra, B. Gharabaghi, P. Goel
Description: In most of the watershed models, Soil Conservation Service Curve Number (SCS-CN) approach is based on soil infiltration characteristics and land use for runoff simulation. These models implicitly assume that runoff is generated by Hortonian process and therefore they are not able to account for the effects of topography or moisture distribution in a watershed. The distributed CN-VSA approach is based on traditional SCS-CN approach to predict runoff amount and uses Topographic Wetness Index (TWI) to spatially distribute runoff source areas within the watershed. The size of the saturated watershed area and their spatial locations are simulated by assuming an average annual value of potential maximum retention for the watershed. However, literature indicates large temporal variation in the value of potential maximum retention during spring summer and fall seasons. This paper focuses on the modification and evaluation of distributed CN-VSA approach to account for the seasonal changes in the potential maximum retention values of the watershed. The modified distributed CN-VSA approach performed better than distributed CN-VSA method to predict runoff amount and size and spatial distribution of the areas contributing runoff. This approach is simple and can be easily incorporated in non-point pollution models
Keywords: SCS runoff curve number, Topographic wetness index, Nonpoint Source Pollution, Saturation excess runoff, Variable source area.
Technical field: Soil and Water Systems Engineering
Conference name: CSBE/SCGAB 2015 Annual Conference, Edmonton, AB, 5-8 July 2015.
Session name: Water Management II - Structures and Modelling
Citation: Panjabi, K., R. Rudra, B. Gharabaghi, P. Goel. 2015. Development and evaluation of modified distributed CN-VSA method for estimation of spatial distribution of Variable Source Areas.. CSBE/SCGAB 2015 Annual Conference, Edmonton, AB, 5-8 July 2015.
Publisher: Canadian Society for Bioengineering
Date: 2015-07-05
Publication type:
  • Technical conference
Type: Text.Article
Identifier: CSBE15115
Coverage: Canada
Language 1: en
Rights: Canadian Society for Bioengineering

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