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Evaluation and optimal regulation of spatial equilibrium of water resources
in large irrigation area based on connection number

1
1
ZHANG Libing 1，2 ，YU Haiguan ，JIN Juliang 1，2 ，HU Yanan ，CUI Yi 1，2 ，WU Chengguo 1，2
（1. College of Civil and Water Conservancy Engineering，Hefei University of Technology，Hefei 230009，China；
2. Institute of Water Resources and Environmental System Engineering，Hefei University of Technology，Hefei 230009，China）

Abstract： The spatial equilibrium evaluation and regulation of regional water resources is the important
technical basis and scientific management method of development and utilization of water resources coordinat⁃
ed with economic and ecological environment development. The amount of water demand and supply respec⁃
tively are comprehensive indicators of natural resource conditions and economic and social activities on wa⁃
ter resources，of which the balance relationship can directly reveal the unit supply-demand equilibrium de⁃
gree and spatial equilibrium degree of water resources system. In this paper a method for evaluating the spa⁃
tial equilibrium degree of regional water resources is proposed on the basis of the relationship between wa⁃
ter supply-demand and seven-element connection number， at the meantime an evaluation and regulation
study is carried out in the water resources system of large irrigation area. Firstly， the water resource sys⁃
tem supply-demand equilibrium degree of each unit （county or city） is defined and calculated by the ratio
of supply and demand difference to total supply and demand. Then， a comprehensive evaluation method
based on the seven-element connection number is constructed，and the evaluation and comparative analysis
of the spatial equilibrium degree of water resources system with and without water resources configuration
within the system are carried out. Then， the amount of water demand and supply in the long-term plan⁃
ning year （2035） is forecast. On this basis， the evaluation and calculation of the unit equilibrium degree
of water resources in each county or city and the overall water resource spatial equilibrium degree of water
resources system of irrigation area are carried out in 2035. Finally， the optimal regulation scheme to im⁃
prove the spatial equilibrium of water resources in irrigation area are put forward. The results show that in
the current level year，the spatial equilibrium degree value of the Pihe Irrigation Area has been significant⁃
ly improved after the allocation of water resources in the system. Under different inflow conditions in the
long-term planning year， the contradiction between supply and demand of water resources is more acute，
which can be solved by the water resources configuration from multiple sources within and outside the sys⁃
tem on the basis of mighty water saving. This study shows that the evaluate method of supply-demand equi⁃
librium degree of water resources can express the disequilibrium of regional water shortage and excess wa⁃
ter，so it can be widely applied to various situations. The improved seven-element connection number evalu⁃
ation model can describe the uncertainty of complex water resources system in more detail， and provide a
new way to accurately identify the spatial equilibrium state of regional water resources system. Due to the
difference of the condition of nature and economic society，the equilibrium degree of water resources of dif⁃
ferent counties and cities are obviously different in a same large irrigation area. The optimal allocation of
water resources among units in the system and the allocation of multiple external water sources，can effec⁃
tively improve the spatial equilibrium degree， which plays an important role in promoting the coordinated
development of water resources and economic society and ensuring the smooth implementation of regional
long-term planning.
Keywords： large irrigation area； water resource system； spatial equilibrium； relationship between supply
and demand；seven-element connection number；comprehensive evaluation；optimal regulation

（责任编辑：韩 昆）
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