Abstract
Water resources in the island area vary greatly from year to year and are unevenly distributed within the year, especially during typhoon and rainstorm periods when the lack of reservoirs leads to a large loss of rainfall and flood resources. In order to improve the water resources supply capacity of the island, this paper takes the excavated underground reservoir on Zhoushan Island as the research object to solve the problem of abundant rainfall and flood resources but lack of saving space during the plum and typhoon floods, and to enhance the self-sufficiency of water resources on the island. The study focuses on three environmental issues in the construction of underground reservoirs, and analyses the actual effect of the resourceful use of rainwater floods using the actual measurement data of Typhoon 2106 (In fa) to prove the feasibility of the construction of underground reservoirs. It makes a useful exploration for the future planning and construction of underground reservoirs on Zhoushan Island using underground space resources to solve water shortage.
Highlights
Many studies have been done by domestic scholars in the past
The water quality and cost of the reservoirs will be used as indicators, and the storage level of the underground reservoirs must not be lower than the average tide level for many years to prevent seawater from backing up and causing pollution to the water quality
Water resources dispatch calculation using the influence of typhoon 2106: 77 surface reservoirs and 30 million m3 of underground reservoirs on the island participate in the dispatch, and 49.476 million m3 of surface runoff is formed in the reservoir area, and the joint dispatch of surface and underground reservoirs can increase the water resources of underground reservoirs by 33.608 million m3
Summary
Many studies have been done by domestic scholars in the past. You Chunfeng[1] and others transformed the reservoir into a "combined surface-underground" reservoir through vertical impermeability treatment of the dam base, which improved the storage capacity and water supply assurance of the reservoir; Li Tong[2] aimed at maximising the utilization of water resources and minimising water abandonment after combined surface water and groundwater regulation, and established Yang Yun et al.[3] used operational research methods to establish an optimal dispatching model for the joint use of multiple reservoirs for water supply, simulating the joint use of plain reservoirs and underground reservoirs; Wang Xingchao[4] demonstrated the feasibility of underground reservoirs in sponge city construction through basic issues such as storage, purification and water circulation paths; Wang Congrong et al.[5] considered that pit-type underground reservoirs would be an important development direction in this field, and proposed that the water quality and quantity of the rechargeable water source should be considered comprehensively.
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