Evaluation of water resources carrying capacity based on quantity-quality-domain-flow in Taiyuan City
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Abstract:
The imbalance of water supply and demand,over-exploitation of groundwater,water pollution,water ecological damage,and other issues have become increasingly prominent under the strong influence of climate warming and human activities.Water resources have become an important factor restricting the sustainable development of the regional economy and society and the health and stability of the ecological environment.Research on the carrying capacity of water resources is of great significance for realizing the coordinated development of water resources,economic society,and ecological environment.In March 2018,the State Council officially approved that Taiyuan should take steps for the transformation and upgrading of resource-based cities as the theme,build an innovative demonstration area of the national sustainable development agenda,implement water resource conservation and water environment reconstruction,and explore systematic solutions to major problems restricting sustainable development.However,Taiyuan is a typical resourcebased city in China,with low per capita water resources,a serious historical debt of groundwater overexploitation,serious water pollution,and water ecological damage.Water resources have become an important ′bottleneck′ restricting its ecological environment protection and high-quality development.Therefore,it is national and local major practical needs to evaluate water resources carrying capacity in Taiyuan City based on the analysis of multidimensional carrying elements of water resources,to provide technical support and decision support for the transformation and upgrading and high-quality development of resource-based cities in Taiyuan City. Based on the analysis of multidimensional carrying elements of water resources,the evaluation index system of water resources carrying capacity was constructed from four dimensions of quantity-quality-domain-flow.The weight of evaluation index was determined by the combination weighting method of AHP and entropy weight method,and the water resources carrying capacity evaluation model based on SMI-P method was established. The evaluation index system and model were applied for the assessment of water resources carrying capacity in Taiyuan.The results indicated that the comprehensive carrying capacity of water resources in Taiyuan was overloaded from 2009 to 2018.From the four dimensions of water resources quantity-quality-watershed-flow,the carrying capacity index of each dimension is on the rise.The carrying state of water quantity dimension changed from overload to critical overload,the carrying state of water quality dimension changed from serious overload to overload,the carrying state of watershed dimension changed from serious overload to overload,and the carrying state of water flow dimension changed from overload to critical overload. Despite the continuous improvement of water resources in Taiyuan City,the tasks of water pollution control,water ecological environment protection,alleviating water conflicts,and improving water use efficiency in Taiyuan City are still very difficult.The problems of resource constraints,ecological function degradation,low environmental carrying capacity,uncoordinated development,and unsustainable development in Taiyuan City are still prominent.In the future,the protection of the water ecological environment in Taiyuan should focus on sewage treatment,wetland restoration,soil and water loss control,which mainly improves the carrying capacity of water quality and watershed dimension.The conclusions of this study can provide technical support and decision support for the transformation and upgrading and high-quality development of resource-based cities in Taiyuan.
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