Monitoring of sediment cell changes in rivers, using basin structural connectivity index (Case study: AbolAbbas Basin in Khuzestan)

Document Type : Research Paper

Authors

1 Assistant Professor, Department of Nature Engineering, Agricultural Sciences and Natural Resources University of Khuzestan, Mollasani. Iran

2 PhD graduate, Gorgan University of Agricultural Sciences and Natural Resources, Golestan, Iran

Abstract

In general, comprehensive watershed management depends on achieving eco-hydrological balance of watersheds and improving the livelihood of stakeholders. One of the main principles of watershed management measures is sediment management through soil protection operations using new techniques such as Sediment connectivity index. Sediment connectivity is an emerging term in watersheds that is often used to describe the internal relationships between runoff and sediment sources in the upper parts to outlet of the relevant watershed. The purpose of this study was to accurately monitor the spatial changes of sediment, using structural Sediment connectivity index and analysis of sediment flow from upstream to the outlet in the basins, which was carried out in AbolAbbas watershed of Khuzestan. The present study is based on the use of Borsley's proposed approach and the use of cover land weighted layer. The results showed that the dimensionless index of sediment connection was estimated with a spatial accuracy of 30 m, ranging from -7.9 to 3.4 and obtained with an average of -5.50. The accuracy of the sediment connection index with an explanation coefficient of 0.56 (R2 = 0.56) has a good accuracy in monitoring the sediment transport potential from the upstream to the basin outlet. However, the results showed that the new method of sediment connectivity index in modeling sediment flow can be a pixel (cellular) tool to identify homogeneous areas in terms of distribution of sediment connection and also to make management decisions and programs.

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