Reaserch On Spatial Distribution Characteristics And Solutions Of Hidden Pollution Perils Of Rivers And Lakes In Longxian County

With the rapid development of cities and the number of population,the hidden pollution perils of solid waste,domestic wastewater and other pollution have led to the deterioration of water quality of rivers and lakes which caused more serious water pollution.This research based on a large number of field survey sample,aimed at the hidden pollution of rivers and lakes in Longxian County and used ArcGIS 10.2 as the operating platform.By using standard deviation ellipse,nearest neighbor index,K function and kernel density analysis and other spatial geographic measurement models and combining Geographic detectors,the spatial distribution characteristics of hidden pollution in Longxian rivers and lakes and the influencing factors of their formation have been studied,and then comprehensively analyzed the causes and characteristics of the hidden pollution perils,furthermore,the feasible solution has been provided.The main contents and conclusions of hidden pollution perils of rivers and lakes in Longxian county are as follows:(1)Survey outline.Survey shows that:① the water pollution caused by solid waste and its leachate;②the agricultural non-point source pollution caused by the occupation of agricultural land on the shoreline of rivers and lakes;③ the direct discharge of sewage into the river and lake.(2)In order to comprehensively understand the spatial distribution status of river and lake pollution hazards in Longxian C ounty and find out the characteristics of its spatial distribution,a variety of geoeconometric models were used such as the county spatial distribution,spatial distribution types,spatial correlation,spatial distribution density and hot spots.Research shows that:①Obviously imbalance among different towns,and are mainly distributed in Chengguan Town,Dongfeng Town,and Dongnan Town;②Different in the spatial distribution direction,and in general,the northwest-southeast direction shows higher density level;③Clustered at multiple distance scales with no spacial scale characteristic;④Significant spatial aggregation auto-correlation;⑤clustered and in different densities;⑥Hot in the middle east and south-east and cold in the west,north and south.(3)The Impact Factor of the spatial distribution of the pollution hazards were studied by using the geographical detector.Studies have shown that:①Under the impact of a single factor,the solid waste about rivers and lakes is mainly formed in the process of agricultural production activities.The agricultural land reclamation of rivers and lakes are greatly affected by the activities of nearby residents and agricultural production and the sewage outlet that emptied into rivers and lakes comes from nearby residential areas and factories to a certain extent.②Under the interaction of the two factors,it is more obvious near the agricultural land of the distribution preference of solid wastes from rivers and lakes to the natural shoreline outside the artificial shoreline.The agricultural land related to rivers and lakes preferred to be reclaimed near the facilities providing access to river courses,such as Bridges and artificial shorelines,etc.,and the sewage outlet directly discharged to rivers and lakes had a significant distribution preference in the areas with dense residential areas and factories.The potential pollution types of various types of rivers and lakes were affected by regional conditions to different degrees.(4)Summary of the causes of the spatial distribution of potential pollution perils.Summarized below:①The role of location significantly affects the spatial distribution of hidden pollution perils as a whole;②The close interaction between various life and production activities in Longxian County drives the formation of rivesr and lakes pollution perils;③Different spatial places constitute the spatial distribution preference;④ The fundamental reason is the lack of garbage collection and treatment facilities,the management and protection of the natural river and lake shoreline is not clear,the sewage management in rural areas is chaotic,the sewage system is backward,and the public is aware of environmental protection.weak.(5)Based on the research results of spatial distribution characteristics and the Impact Factor of Longxian river and lake pollution hazards,combined with a variety of spatial analysis methods,the countermeasures were put forward.The main contents are as follows:① The use of geographical database and thematic map methods to help managers to Longxian river and lake pollution hidden dangers of the relevant status information for a comprehensive grasp.②Taking administrative villages as a unit,zoning statistical method is used to divide the key control areas of pollution hidden dangers,so as to help the rational allocation of human and material resources in the process of governance.③Based on a variety of spatial analysis methods,this paper classified the demand degree of garbage collection and transportation in the river and lake areas near Longxian,the prevention and control of agricultural non-point source pollution in the river and lake areas near Longxian,and the suitability of sewage discharge reconstruction in factories and residential areas in Longxian,so as to control the source of potential pollution.④ Based on the spatial preference law of river and lake pollution hidden danger formation,and combined with a variety of spatial analysis methods,the location of important monitoring nodes and warning signs for the planning and site selection of hidden perils is recommended,which lays a foundation for consolidating the governance achievements and strengthening the supervision and management mechanism.