Classification Of The Bank Line Of The Dawen River And Resource Health Evaluation Under The Influence Of Water Conservancy Projects

The river shoreline has rich natural functions and social value,and has become an important foundation and valuable strategic resource for China’s economic and social construction.As a representative river in the central and southern regions of Shandong,Dawen River is an economic center axis that connects the east and west,connecting the Huanghuai River.It is of great significance for the water resources and economic development of Shandong Province.To study the distribution and health status of river shoreline resources,a classification method and standard for river shorelines were proposed based on the natural conditions and artificial development level of the main stream shoreline of the Dawen River.Based on the classification results,a health assessment model for river shoreline resources is constructed using the Pressure State Response(PSR)model.Taking the main stream of Dawen River as the application object,a shoreline classification and evaluation model was applied to analyze and compare the health status of shoreline resources in the main stream of Dawen River under the influence of hydraulic engineering.At the same time,the grey GM(1,1)prediction model was used to predict and analyze the results of shoreline resource health evaluation from 2023 to 2025.The main research content and achievements of the paper are as follows:(1)According to the principle of determining shorelines,the water land interaction line or defense line is used as the baseline for the final classification of shoreline types and statistical shoreline utilization length.The land area behind the water land interaction line or defense line is 1000 km,which is the judgment range for shoreline resource utilization.Divide river shoreline resources into natural shorelines and development shorelines.Natural shorelines include ecological shorelines and agricultural shorelines,while development shorelines include port and dock shorelines,industrial production shorelines,urban living shorelines,and other development shorelines.Establish a shoreline utilization classification system based on the principle of priority level.(2)Select characteristic representative years(2000,2006,2012,2018-2022)to preprocess remote sensing image data and create remote sensing work base maps within the river and lake shoreline range;On this basis,taking the main stream of the Dawen River as an example,land use classification and visual interpretation of remote sensing images were carried out based on the land features of various types of shorelines obtained from shoreline monitoring and investigation work,and the classification results of the main stream of the Dawen River were obtained.Draw a land use map and classification result map of the main stream of the Dawen River with representative features.By analyzing the interannual and spatial changes in the classification results of the shoreline,it was found that the main shoreline of the Dawen River is mainly agricultural shoreline,and the utilization rate of the Jinan section is significantly higher than that of the Tai’an section.The construction of water conservancy projects will lead to an increase in other development shorelines,industrial production shorelines,and urban living shorelines,significantly increasing the degree of shoreline development and utilization.(3)Based on the characteristics of the ecological status of river shorelines and the actual investigation situation,the PSR model is used to divide the evaluation index system of river shorelines into three categories: pressure index,state index,and response index;A river shoreline evaluation index system was constructed by selecting 20 evaluation factors,and the G2 entropy weight method was used to determine the weights of each index.A shoreline resource health evaluation model was established.(4)Taking Dawen River as an example,this paper evaluates the health of shoreline resources in the main stream of Dawen River,which represents the annual shoreline characteristics.The evaluation results show that the shoreline resource health evaluation model can accurately characterize the health status of shoreline resources.Analyze the changes in various indicators under the influence of water conservancy projects and draw a graph of changes in the health evaluation results of the Dawen River shoreline resources.The water conservancy projects have led to more arable land and construction land on the Dawen River shoreline,worse river chaos,increased bank slope stability,riverbank width index,and vegetation coverage,improved the satisfaction of the minimum ecological water level and transportation conditions,and overall promoted the health improvement of the Dawen River main stream shoreline resources.Using the GM(1,1)prediction model,predict the health of shoreline resources from2023 to 2025 based on the evaluation results from 2000 to 2022.The prediction results indicate that there will still be a significant improvement in the health status of the Dawen River shoreline resources from 2023 to 2025,with the greatest change in pressure indicators.The degree of improvement in the health status of resources varies among different shoreline sections.The improvement of shoreline resources with better water conservancy engineering construction is higher than that with worse water conservancy construction.Based on the evaluation results,suggestions are proposed for the development and utilization of the shoreline and the reasonable construction of water conservancy projects,providing a basis for the utilization and protection of resources along the Dawen River shoreline and the construction of water conservancy projects.