| Beijing-Tianj in-Hebei region is one of the regions with the fastest economic development in China.The population is huge,the industry is intensive,and the demand for water resources is large.However,the amount of water resources is seriously insufficient,and the conflict between supply and demand has become increasingly prominent.The connectivity of river ecological processes is a key indicator to reflect the water environment quality of a river basin,water supply capacity,continuity of water flow processes,and ecological restoration effects.Research on the connectivity of regional river ecosystem processes to protect the water environment,optimize the allocation of water resources,and improve water network regulation and storage Capacity and restoration of ecological quality in river basins provide scientific basis.Based on hydrological data,dem elevation data,etc.,the paper studies the connectivity and assessment of river ecosystems,runoff,water quality,and the distribution of water conservancy facilities in major rivers in the Beijing-Tianjin-Hebei region,and builds a connectivity assessment model for river ecosystems.The status of the connectivity of the ecological processes of the river basins in each river basin,and further analysis of the regional effects resulting from the connectivity of the ecosystem processes of the rivers,the main contents and conclusions of the study are as follows:(1)Constructing an evaluation model for ecological process connectivity of Beijing-Tianj in-Hebei region water system.According to the actual conditions of the region,river runoff,river level,water quality level,and distribution of water conservancy facilities in the river basin were selected as the main assessment factors to construct a water ecosystem ecological process connectivity assessment model,and various evaluation indicators in the model calculation were analyzed in depth.(2)The results of the connectivity assessment of ecological processes in the Beijing-Tianj in-Hebei region water system.The connectivity of major river ecosystems in the study area was ranked as follows:Luan River and Jidong coastal river systems(F=0.288427),Yongding River system(F=0.248228),Daqing River system(F=0.237800),and Beisanhe River system.(F=0.226208),Ziya river system(F=0.216068),Heilonggang and Yunhe river system(F=0.010442).As the connectivity of the ecological process,the greater the value of F,the stronger the connectivity of the ecological process.Secondly,in each of the river basins,the main rivers have large catchment,high river ranks,and the connectivity is better than other rivers.(3)Regional effects due to the connectivity of ecosystem processes in rivers.Ecological radiation effects in regional water conservation areas:The river systems of the Luan and Jidong coastal areas water system have the highest connectivity and the strongest radiation capacity;the Beisanhe river system has general connectivity and the overall radiation capacity is insufficient;The upstream of the river system in Yongding River has good connectivity,and it has certain radiation capacity to the downstream Beijing.the main radiation range in the upper reaches of the Daqing River Basin is the hinterland of the Hebei Plain;the radiation ability of the Ziya River water system is poor;and there is basically no radiation effect in the Heilonggang and Yundong River system.Water environment quality:From 2001 to 2015,the connectivity of the river systems in the coastal areas of Luan and Jidong coastal areas water system was the best,and the ratio of water quality of the rivers of Class III to those of the total length of the river was as high as 60-70%.Yongding River water system and Daqinghe River water system were inferior.The proportion of Grade V water quality is about 30-40%,and the ratio of poor Grade V water quality such as Ziyahe River water system,Heilonggang and Yundong River water system is about 60-70%.The lower the river connectivity is,the worse the water quality is.In terms of water supply capacity,river connectivity is closely related to water supply capacity,and groundwater in the plain areas with poor connectivity is heavily used to extract groundwater.The situation of the regional underground funnel is getting worse,especially the Ziya River,Heilonggang Port and Yundong Zhuhe River.Water system is the main concentration area of underground funnels. |
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