Abstract
In order to promote the construction of Guangdong-Hong Kong-Macao Greater Bay Area, we should take into account the improvement of regional water environment while developing economy in Pearl River Estuary area. The water environmental dispatch scheme of river network is an important part of water environment improvement, and the key technology of dispatch is to determine the appropriate dispatch path, timing, scale and mode. The Hengqin Central River is taken as the study area in the paper. Based on the analysis of the characteristics of Hengqin Central River, the characteristics of nearby tides and water environment, this paper determines the dispatching path of “diversion from the east to the west”, the time of diversion during flood tide and drainage during ebb tide, the dispatching mode of sluice control, the dispatching scale of more water exchange during spring tide and less water exchange during neap tides, and puts forward the landscape dispatching scheme and the dilution dispatching scheme. In this paper, the semiexchange period and the rate of water exchange are taken as the evaluation indexes, and the dispatching effects of different schemes are analyzed by simulating different control schemes through water quality and quantity models. The results show that the water exchange capacity of Hengqin Central River network will be greatly enhanced when the diversion and drainage amplitude increases. The research results provide reference for water quality protection and control in the Pearl River Estuary complex river network.
Highlights
The Pearl River Estuary is close to the ocean, with a large population and a developed economy
Taking Hengqin Central River (Fig. 1) as an example, this paper studies the improvement of water exchange by the regulation of water conservancy projects in the inland river network area around the estuary
Hengqin Central River belongs to the typical river network area in the Pearl River Estuary, where river network is dense
Summary
The Pearl River Estuary is close to the ocean, with a large population and a developed economy. Estuary economic development ignores the regional water environment, resulting in the deterioration of the water environment in the past. The water environment load of the river is serious and exceeds the self-purification capacity. Effective control and strict control of pollution sources is the key to harness the river's water environment. The control of pollution sources is a long-term task. Before the pollution sources are effectively controlled, the water flow can be accelerated, the water self-purification capacity can be improved and the water environment capacity can be increased through the scientific regulation of water conservancy projects, which can alleviate regional water environmental problems. In the tidal river network area, the water quantity is abundant and the water conservancy facilities are dense, which has favorable conditions for improving the water quality and water ecology of the river [1,2,3]
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