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Comparison of different structures for a monthly water yield model in seasonally snow-covered mountainous watersheds of Iran

Abstract:

This paper attempts to search for a suitable structure of a monthly water yield model applicable for seasonally snow-covered mountainous catchments located in a semiarid area. In this respect several model structures based on a soil water balance concept were compared. The main distinction between the different structures was made bythe inclusion of either a linear or a nonlinear transformation element for the conversion of overland flow or baseflow into totalrunoff. A combined water balance model having two main elements, a soil storage element generating excess water, and a transformation element conceptualized by a linear storage-discharge relationship, was found to be the most accurate. © 1990 Taylor and Francis Group, LLC.