Water and Irrigation Management

Water and Irrigation Management

Spatial Analysis of Agricultural Water Distribution to Specified the Surface and Groundwater Resources in the System of Environmental-Economic Water Accounting’s Physical Supply Table, Study Area of Abshar Irrigation District

Document Type : Research Paper

Authors
Farhad Behzadi
S. Mehdy Hashemy Shahdany
Water Engineering Department, Faculty of Agricultural Technology, University College of Agriculture & Natural Resources, University of Tehran, Tehran, Iran.
10.22059/jwim.2023.354716.1046
Abstract
This study aims to investigate and specify surface and groundwater sources portions in the physical supply table of the environmental-economic water accounting method (SEEWA-Water) in the Abshar Irrigation District through the developing hydraulic simulation model of flow in the main & lateral canals, spatial analysis of surface water distribution process, and water extraction analysis from exploitation tube-wells located in the district. For this purpose, the simulation of water distribution within irrigated units was conducted by developing the integral-delay simulator model in MATLAB. Then, spatial analysis of surface water distribution adequacy was conducted in GIS under different operational scenarios. The simulation results of surface water distribution indicated the decreasing trend of the adequacy of surface water distribution and delivery from upstream to downstream catchments. The spatial analysis results showed the share of surface and groundwater separately for 59 villages with rights and then for each village according to the main crops. The results showed that the surface water distributed in each sub-channels upstream and downstream villages provided 35-48% and 60-49% of agricultural demand, respectively. The spatial analysis (the water resources portions based on the main crops of the cropping pattern) reveals the customized components in the physical supply table in the SEEA-Water accounting method for an irrigation district, surface & groundwater water resources share, and distribution losses in Abshar Irrigation District.
Keywords
Spatial analysis of surface water distribution
Abshar Irrigation District
Flow Hydraulic Simulation
Environmental-Economic Water Accounting
Subjects
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Water and Irrigation Management
Volume 13, Issue 1
Spring 2023
Pages 105-121