| The contradiction between supply and demand of water resources in Hebei Province is acute,and there are long-standing problems such as water shortage in some areas,groundwater overdrawing and declining groundwater level.With the deepening of water environment management,groundwater over-exploitation control,groundwater resource protection action and water conservation work for the whole society have been carried out.Based on the water resources situation in the study area,this paper systematically analyzes the distribution of surface water and groundwater,the current situation of exploitation and utilization and the existing problems,predicts the supply and demand of water resources and constructs a water resources optimization allocation model to reasonably allocate the water resources in Pingshan County,and finally puts forward suggestions for water resources utilization and protection in Pingshan County.The main research contents and research results are as follows.1.Collection and field research of regional water resources data,overview of the natural environment,socio-economic conditions and water resources in the study area of Pingshan County,and analysis of water resources development and utilization and problems in the area based on the current situation year,to provide data support for the subsequent water demand and supply forecasting.2.Water supply and demand forecasting is one of the important tasks in conducting research on the utilization and protection of groundwater resources,and can be used as an important basis for rational planning of water resources and as an important reference indicator for making water supply decisions and making water resources investments.This paper uses 2019 as the status quo year and 2025 and 2035 as the planning level years,and adopts the index prediction method to forecast the socio-economic development indicators of Pingshan County,and then adopts the quota method and combines it with the actual forecast of water supply and demand for the planning level years.3.Through the principle of constructing the water resources optimization allocation model,the method of constructing the water resources allocation network diagram,the objective function,constraints and equilibrium equation of the allocation model,the idea of"water resources development,utilization and protection" is incorporated into the water resources optimization allocation,and the allocation process and results are refined to each township unit.At the same time,the GAMS model,which is a mature model,is used for the solution.It lays the theoretical basis for the subsequent water demand forecast and water supply forecast.4.In order to develop two water demand scenarios(Scenario A:moderate growth,Scenario B:high growth)for different planning levels(2025 and 2035),under the flow constraints such as ecological water use in the river at key control cross-sections in the county,a multi-year long series of month-by-month adjustment calculations were carried out using the primary and secondary allocation adjusted models to obtain the balanced allocation of water resources supply and demand under different future development scenarios in Pingshan County.The results.Through comparison,the optimized water resources allocation scenario(high speed development)was selected for the planning year,and the results of the overall optimized water resources allocation and water supply allocation in Pingshan County were analyzed,as well as the trend of groundwater level changes in Pingshan County under different water supply guarantee rates(P=50%and P=75%).5.Based on the analysis of water resources optimization allocation results,to protect water resources in Pingshan County,reasonably utilize surface water,reduce groundwater development and utilization,and combine with the future development plan of Pingshan County,we propose water resources utilization and protection with county characteristics of Pingshan County.In order to prevent groundwater overdraft and water quality contamination,combined with the existing water resources protection projects in Pingshan County,we propose measures and concepts including centralized water supply source protection,centralized collection and treatment of domestic waste and rural sewage and management about water quality protection,and implement the strictest water resources management system in Hebei Province and establish a groundwater protection system and carry out joint monitoring of water quality to ensure the sustainable use of water resources in Pingshan County.To ensure the sustainable use of water resources in Pingshan County. |
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