Evaluation Of Water Resources Vulnerability In Guiyang

With the rapid development of population and social economy,the human demand for water resources is increasing day by day.At the same time,climate change and environmental pollution lead to the decrease of available water resources,and the contradiction between supply and demand of water resources is prominent.It has become one of the main factors hindering the sustainable development of the region.Studying the vulnerability of water resources and its changing trend and grasping the safety crisis of water resources can provide a reference for the utilization and protection of water resources.Vulnerability assessment of water resources is an important research field of water resources security assessment in China.The vulnerability of water resources reflects the degree of stability of water resources,but the assessment of vulnerability of groundwater resources and surface watersheds is more mature.However,there are few researches on urban water resources vulnerability assessment,and the concept of water resources vulnerability is not clear,the evaluation criteria are different,and the selection of evaluation indicators and methods is controversial.For evaluation,the vulnerability of water resources is mostly focused on the quantitative evaluation on time scale,while ignoring the dynamic changes in space.Therefore,the paper carried out a study on the vulnerability assessment of water resources in Guiyang.The main contents and conclusions are as follows:(1)Climate:There is a significant positive correlation between the amount of water resources and precipitation,which reaches 99.9% of the consistency test,in which the summer precipitation in Guiyang City has a significant impact on the annual precipitation,and then affect the amount of water resources;The effect of air temperature on water resources is mainly reflected in the effect on surface evapotranspiration.The probability of the correlation between temperature and evaporation is as high as 99%.The increase of evaporation will result in the degradation of regional vegetation and the decrease of water resources conservation capacity.It affects crop growth and ecological vegetation water demand,thus affecting the amount of water resources in the whole region.Man In terms of activities: human being is the object of consumption of water resources,and the increasing population will inevitably lead to the increase of water demand.At the same time,the quality of population and the social and economic composition of the population are closely related to the development,utilization and management of freshwater resources;On the one hand,economic growth usually leads to the increase of water consumption,on the other hand,economic growth will also be accompanied by the improvement of water resources adaptability;The effects of land use on water resources are mainly reflected in the different parameters of soil physical structure,degree of porosity,porosity and water permeability,which lead to different types of land use.Water storage,water retention capacity is also different.(2)In terms of indicator system construction,based on the definition of exposure,sensitivity and adaptability of the IPCC SREX report and the Intergovernmental Panel on Climate change,based on the concept of water resource vulnerability,and in conjunction with the recommendations of relevant departments and experts in the study area,The index system was constructed,and then 15 evaluation indexes were selected according to the cluster analysis,and the evaluation criteria and methods were determined.(3)In general,the vulnerability of water resources in Guiyang was gradually improved,in which the vulnerability of water resources decreased in Yunyan,Nanming,Huaxi,Baiyun and Xiuwen counties,but increased in Qingzhen,Xifeng,Kaiyang and Wudang.In different stages,the vulnerability of water resources in Guiyang was relatively high in 2000,and the highest vulnerability of water resources was in Yunyan and Nanming areas.In 2005,the vulnerability of water resources in Guiyang was relatively low.The severe and extreme vulnerability decreased from 31.34% of the whole city area in 2000 to 14.23%,only a few of them were still distributed in the Yunyan and Nanming areas,and the overall area covered with safe drinking water was good.In 2010,the vulnerability area of water resources in Guiyang City increased obviously on the basis of 2005.Severe and extreme vulnerability rose from 14.5% in 2005.From 23% to 27.62% in 2010,the area of severe vulnerability and extreme vulnerability was expanded from the Yunyan area and the Nanming District to the Baiyun area.Guanshan Lake District(New County Boundary)and Huaxi District.In 2015,the vulnerability area of water resources in Guiyang City decreased from 27.62% in 2010 to 25.47% in 2015,and the area of water resources vulnerability in Guiyang City decreased from 27.62% in 2010 to 25.47% in 2015.The vulnerability of water resources in Baiyun region and Guanshan Lake region decreased greatly,while the regions with significant water resources vulnerability were mainly concentrated in Qingzhen City,Kaiyang County and Xifeng City.Part of the county.(4)According to the actual situation of water resources vulnerability in Guiyang,the corresponding countermeasures are put forward from three aspects of exposure,sensitivity and adaptability,which will provide reference for the utilization and protection of water resources in Guiyang.