Professor Binghua Li - Beijing Water Science and Technology Institute
Co-author(s): Mr. Yinxin GE, Individual, Dr. Moyuan YANG, individual
Subtopic
2-1. Water supply and demand management
Body
The pertinence and accuracy of the effect evaluation for comprehensive control measures of groundwater over-exploitation（GWOE） in Beijing are not so good. It is urgent to establish a scientific evaluation method, to sort out the relationship between the control measures and its effect, thus to quantitatively evaluate the implementation effect of various measures. Here, we proposed the principles of the evaluation index system for the measures of GWOE, and built a comprehensive evaluation index system for the measures effect with multiple indicators, themes and levels based on the dynamic tracking and requirements of GWOE controls in Beijing. The indicators were screened from three dimensions including representativeness, relevance and quantifiability, then 14 indicators for measures and 3 indicators for effect evaluation were selected. Coupled analytic hierarchy process(AHP) and expert scoring , a new method for effect evaluation of GWOE controls was established.The results showed that contribution ratios of the amount of water replenished by rivers and lakes, and the amount of replacement of groundwater sources among those measures were relatively higher ,which reached up to 53.03%,26.29% respectively. Moreover, comprehensive control effect index of GWOE was given for each year, which was 1.45, 0.65 and 1.31 for 2019-2021. In the perspective of effect, the groundwater depth in the plain area dropped from 23.03 meters to 16.39 meters, in other words the corresponding groundwater level increased by 6.64 meters, and the groundwater storage increased by 3.386 billion m ³ from 2019 to 2021. As for the 16 districts, the increasing of groundwater level in Shijingshan was the largest(26.33m), while that in Tongzhou was the smallest(0.84m). Finally, the optimization measures for GWOE were given by comprehensively considering the water use, water supply, water transmission , location planning and positioning. These results can provides strong support for the continuous improvement of the comprehensive measures of GWOE in Beijing.