The Model And Its Application Of Multi-dimensional Synergy For Water Resources Regulation And Controlling Based On Hydrological Simulation In The Inner Mongolia Plateau

The Inner Mongolia Plateau that smaller than the Qinghai-Tibet Plateau is the second largest plateau in China.The coexistence of grassland,desert,forest and coal in this region is not only a natural ecological barrier for the Beijing-Tianjin-Hebei region and north China but also an important base for animal husbandry and energy industry.Faced with resource constraints tightening,worst river environment such as pollution,ecosystem degradation,there is a balance point in the pastoral areas of Inner Mongolia plateau between the national economic and social sustainable development and ecological environment protection for the water consume competition,we need to seek a compromise for zonal water balance,so this paper carries out the research " The model and its application of multi-dimensional synergy for water resources regulation and controlling based on hydrological simulation in the Inner Mongolia Plateau " is vitally necessary.This study makes a detail discussion on the following two key issues:firstly,how the vegetation ecosystem responds to the water cycle process in Inner Mongolia plateau inland region,and secondly how to determine the critical ecological water level and the safe threshold of water resources development and utilization,so as to avoid the change of hydrological situation to change the ecological pattern of the basin.Based on the basic identification of the evolution mechanism of eco-hydrological process in Inner Mongolia plateau basin,with the identified of the "natural-artificial"dual driving model including the process of eco-hydrological evolution in Inner Mongolia plateau basin,this paper analyzes the driving force pattern of natural and artificial water cycle,and construct the theoretical framework and technology of the research on the comprehensive regulation of water resources,then establish the coupling model of surface water and groundwater and the multi-dimensional collaborative optimal allocation model,and last put it to the practice of Xilin River basin(typical representative of grassland).The main advances and results are as follows.1.On one hand,due to the lack of precipitation,the less development of surface water system,and the spatiotemporal difference of underground water abundance controlled by terrain and other factors,the limitation of water resources determines that this region must take an intensive,green and high-quality development path;On the other hand,the ecosystem is less stable and more vulnerable to the interference of human activities.This multi-attribute of water resources determines that this region must step on the road of ecological priority and water quantity development.In view of this problem,this paper expounds the water resources regulation mechanism applicable to Inner Mongolia plateau from the perspective of hydrological cycle theory and vegetation ecological water demand and then proposes a two-level comprehensive regulation model based on process coupling simulation and multi-dimensional cooperative configuration.2.Based on the proposed control model above,according to the mechanism of the vegetation ecosystem that depend on groundwater,this paper determine the required to maintain normal ecological process and ecological function of the safety of the key properties of groundwater,simulate and calculate the initial configuration state of groundwater recharge and groundwater flow field of each hydro-unit,compare with the changes of calculation level results and the ecological water level.Secondly,this paper determines the ecological restoration development goals for the water deficit area and calculate the ecological groundwater consumption under the goals so that the groundwater level is proper for reflecting the aquifer flow system by water resources allocation scheme adjustment.Finally,the model of exploitation and utilization of groundwater for grassland ecological protection is given.3.The Xilin River Basin was taken as typical grassland areas,and a numerical simulation model and an optimal allocation model of water resources were used to study the regulation of water resources,and the following conclusions were obtained:(1)Xilin river is a typical seasonal river,affected by the melting snow in the spring season,spring runoff is greater than the summer and autumn flood season.In views of the inter-annual scale,the precipitation from 1953 to 2017 in a downward trend in scales,but no significant decline,the time scale can be divided into natural different variation period through the accumulation of precipitation and runoff curve.The results show that the phase ? was a period controlled by the climate changes,phase ? affected by the human activities,and phase ? was led by coupling factors between natural and human.Moreover,the phase ? runoff decrease amplitude is bigger than the other two-phase,which reached up to 45.79%,precipitation decreased by 21.03%,and the potential evaporation increase rate of 6.15%.Compared with phase ?,the other two-phase has fallen slightly in the potential evaporation.(2)The surface water-groundwater coupling model of the Xilin river based on GSFLOW was established.The simulation results reveal that the R2 of single target rate-setting and multi-target rate-setting were all great,the NSE,RMSE,PBIAS are 0.81,0.21 m3/s,-1.8%respectively,and the runoff process curve fitting effect was good.The other three evaluation indexes of NSE,RMSE and PBIAS also showed that the simulation results were good on the whole.(3)During calibration period from 2008 to 2012,the total groundwater supply in Xilin river basin was 130.28 million cubic meters per year,total excretion was 134.45 million cubic meters per year,and the compensation and drainage difference was-4.17 million cubic meters per year,indicating that the aquifer groundwater in the basin was in a negative equilibrium state.During the verification period from 2013 to 2017,the total groundwater recharge in Xilin river basin was 116.98 million cubic meters per year,the excretion was 125.25 million cubic meters per year,and the recharge and drainage difference was-8.27 million cubic meters per year,indicating that the groundwater in the working area was still in a negative equilibrium state recently.Compared with the multi-year average water balance in history,the recharge decreased by 13.3 million cubic meters per year,and the discharge decreased by 9.19 million cubic meters per year.The decreased degree of recharge is much more than discharge.The imbalance between groundwater recharge and discharge was still worse,but the decline rate of the regional groundwater level was slowing down.(4)In typical year,for multi-years average of insurance rate,the total water supply,water demand,water deficit,water deficit percentage of XILIN River are 82.16 million cubic meters,70.51 million cubic meters,11.65 million cubic meters,14.18%respectively.for 50%of insurance rate,the total water supply,water demand,water deficit,water deficit percentage are 81.52 million cubic meters,70.13 million cubic meters,11.39 million cubic meters,13.97%respectively.for 75%of insurance rate,the total water supply,water demand,water deficit,water deficit percentage are 83.84 million cubic meters,71.32 million cubic meters,12.52 million cubic meters,14.93%respectively.for 95%of insurance rate,the total water supply,water demand,water deficit,water deficit percentage are 87.29 million cubic meters,72.45 million cubic meters,14.84 million cubic meters,17.00%respectively.(5)Comparing with the degree order of contrastive analysis calculated by the water resources allocation model under different patterns,considering the most optimal situation into consideration,case 4 was selected as a recommendation for the year 2025 that ensure the coordinated development of economic construction and ecological protection,By 2025,under the conditions of green and high-quality development and enhanced water-saving,for multi-years average of insurance rate,the total water supply,water demand,water deficit,water deficit percentage of XILIN River are 101.88 million cubic meters,97.33 million cubic meters,4.55 million cubic meters,4.47%respectively.for 50%of insurance rate,the total water supply,water demand,water deficit,water deficit percentage are 100.68 million cubic meters,96.57 million cubic meters,4.11 million cubic meters,4.08%respectively.for 75%of insurance rate,the total water supply,water demand,water deficit,water deficit percentage are 104.54 million cubic meters,99.19 million cubic meters,5.35 million cubic meters,5.12%respectively.for 95%of insurance rate,the total water supply,water demand,water deficit,water deficit percentage are 109.12 million cubic meters,101.82 million cubic meters,7.30 million cubic meters,6.69%respectively.(6)Case 6 was selected as a recommendation for the year 2030 that highlights the importance and priority of grassland protection and ensure the sustainable development on economic and social system.By 2030,for multi-years average of insurance rate,the total water supply,water demand,water deficit,water deficit percentage of XILIN River are 108.19 million cubic meters,107.36 million cubic meters,0.83 million cubic meters,0.77%respectively.for 50%of insurance rate,the total water supply,water demand,water deficit,water deficit percentage are 106.55 million cubic meters,105.87 million cubic meters,0.68 million cubic meters,0.64%respectively.for 75%of insurance rate,the total water supply,water demand,water deficit,water deficit percentage are 109.30 million cubic meters,105.99 million cubic meters,3.31 million cubic meters,3.03%respectively.for 95%of insurance rate,the total water supply,water demand,water deficit,water deficit percentage are 112.73 million cubic meters,105.30 million cubic meters,7.43 million cubic meters,6.59%respectively.In short,based on the first regulation of coupling controlling the ecological water level and the sustainable yield and the second regulation on comprehensive multidimensional coordinate allocation among water resources,economy,society,ecology and environment,this paper apply hydrological numerical simulation model and synergetics allocation method,then realize the goals that changed the situation that the ecological and environmental water demand was occupied by the social and economic system water consumption for a long time in typical grassland,and green and high-quality development for pastoral area and Beauty Xilinhot City construction.