Study on the connection and regulation of typical complex river network in the pearl river estuary
[Objective]River water system is an important resource and environmental carrier for cities,and water system connec-tivity is an important condition to ensure the health and integrity of the river system and normal functioning of river system.The regulation of live water is an important means to improve the mobility of water and the ecological environment of water,and the water system connectivity index is the key to analyzing and evaluating connectivity.[Methods]In view of the complex river net-work area of the Pearl River Delta,the proportion of the length of the reciprocating river reach and the cutoff river reach is included in the evaluation index system of water system connectivity for the first time.The existing problems of water system in typical re-gions are studied and analyzed,and the scheme of water system connection and operation is proposed.The effect of the scheme is e-valuated by mathematical model,and the engineering problems of water system connection and operation of complex river network in the Pearl River Delta are studied.[Results]The result show that the current Liang'an water system has poor hydrodynamic condi-tions,with problems such as reciprocating flow and long water exchange cycles.Water quality pollution is severe.Through dred-ging,water system connectivity,and water diversion engineering scheduling,the reciprocating flow is transformed into unidirection-al flow,reducing the average water exchange cycle of the current 15.3 d river to 7.3 d at a minimum,and increasing the current flow rate of the river from 0.021 m/s to 0.124 m/s at a maximum.The hydrodynamic conditions and water quality in the region have been significantly improved.[Conclusion]The result show that for the rivers in the highly urbanized areas of the Pearl River Delta,reciprocating river reach and the cutoff river reach often affect the water quality of river network.The targeted evaluation index sys-tem of water system connectivity is proposed,and appropriate measures such as the regulation of water diversion projects are taken to strengthen the internal circulation of the water system,which can improve the water quality of the water system and enhance the effect of comprehensive treatment of the water system.The study can provide a typical case reference for the improvement and solu-tion of water environment problems in the complex river network area of the Pearl River Delta.
Pearl River Deltainterconnected water systemindicator systemwater environmentliving waterwater resources scheduling
国家科技期刊平台
NSTL
万方数据
维普
