Research on the construction of river-lake system connectivity and national water network
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Abstract:
With the rapid development of economics and society,especially with the implementation of “reform and opening up” to the outside world,the industry and urbanization developed very quickly in China.The rapid development of industry resulted in the considerable need for water resources,and the great changes of water cycle among supply,uses,assumption and drainage.It further resulted in the great challenge on water supply,as well as the exacerbation of water quality and deterioration of aquatic ecosystems.On the other hand,rapid urbanization affected the relationship between rivers and lakes,and resulted in fragmentation of rivers and shrinkage even disappearance of lakes.In order to improve the water security,it is quite necessary to construct the national water networks with the capability of adjustment between abundant and dry periods,as well as complementary between western and eastern China.Considering the strategic needs of national water security,the overall layout of national water network was investigated,and the strategic needs of river-lake system connectivity were analyzed.Possible effects of river-lake system connectivity on water resources,flood control,ecological system,environment,society and economics were comprehensively analyzed through multidisciplinary ways.The function and roles of South-North Water Transfer Project in the construction of national water network were also identified.Great efforts have been made to comprehensively analyze the key issues and difficulties in river-lake system connectivity through multidisciplinary and systematic research,so as to provide reference and scientific support for the construction of national water network. From the analysis on the connectivity of river-lake system,it was found that the connection of river-lake system and the construction of national water networks are the most important national strategy to improve water security in China.Major functions and roles of the national water networks mainly focused on the improvement of water resources allocation and water supply,improvement of water quality and aquatic ecosystem,as well as the improvement of capability to mitigate floods and droughts.The objective of connection for rivers and lakes should respect the law of naturalized hydrological cycle and evolution of rivers and lakes,and consider the functions of water resources,environment,and ecology.Through the construction of reservoirs,dams/weirs,pumping stations and channels,national water networks will be constructed at the national,regional and urban scales.The water networks will be characterized with reasonable layout,different functions,storage and drainage,regulation and control,adjustment between abundant and dry periods,mutually supplement among different sources,flows clearly,and excellent environment.
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