The Simulation Study On Hydrology And Water Quality Of Ecological Restoration In Zhangjiazui Watershed,Maolihu Lake,Jinshi City,Changde

In this research,the HSPF hydrological model is used to simulate the ecological hydrological process and water quality process of Zhangjiazui small watershed under the ecological restoration planning of different land use patterns,and quantitative analysis the ecological hydrology and water quality process in this watershed.In order to select the best ecological restoration planning for Zhangjiazui small watershed,Verifying the rationality and effectiveness of the ecological restoration planning.In this research,the Zhangjiazui watershed was selected as the study area,and the ArcGIS and HSPF hydrological models were used to simulate the ecological hydrological and water quality processes under different vegetation patterns on a small watershed.The main conclusions are as follows:1)The comparison between the current situation and the planning shows that compared with the current runoff,the planning has reduced the runoff by 0.0003 ft3/s,the adjustment planning 1 has reduced the runoff by 0.0014 ft3/s,the adjustment planning 2 has reduced the runoff by 0.0010 ft3/s,and adjustment planning 3 has reduced runoff by 0.0003 ft3/s.The program's water and soil conservation forces are better than the current situation,and the comparison of the runoff of the planning and the adjustment planning which is adjustment planning 1 have the smallest runoff,followed by the adjustment planning 2,and the adjustment planning 3 has the largest runoff.2)The comparison between the current situation and the planning in the water quality model shows that,the water temperature in the planning has been reduced by 0.236°F,the sediment content has been reduced by 0.0018 mg/l,and the total nitrogen and total phosphorus contents have been reduced by 0.045 mg/l and 0.051 mg/l,the BOD content was reduced by 0.513 mg/l;the water temperature at adjustment planning 1 was reduced by 0.043 °F,the sediment content was reduced by0.0019 mg/l,and the total nitrogen and total phosphorus contents were reduced by 0.084 mg/1 and 0.057 mg/l,the BOD content was reduced by 0.731 mg/l;the water temperature at adjustment planning 2 was reduced by 0.154 °F,the sediment content was reduced by0.0014 mg/l,and the total nitrogen and total phosphorus contents were reduced by 0.068 mg/1 and 0.055 mg/l,BOD content decreased by 0.643 mg/1;adjustment planning 3 reduced water temperature by 0.149°F,sediment content decreased by 0.0006 mg/l,and total nitrogen and total phosphorus decreased by 0.045 mg/l and 0.051 mg/l,BOD content decreased by 0.513 mg/l.Comparison of the water quality data between the planning and the adjustment planning shows that the greatest change in water quality is adjustment planning 1,followed by adjustment planning 2 and planning,and adjustment planning 3 has the smallest change in water quality.3)a significant test is made for the current situation and the plans.The results show that there is a significant difference between the planning and the three group adjustment planning compared with the current situation.The difference between current situation and adjustment planning 1 is the most obvious,the current situation and the adjustment planning 2 and the plan difference are different,and the difference between the current situation and the adjustment planning 3 is the most significant difference.In the plans,there are significant differences between planning and adjustment planning 1,the planning and adjustment planning 2,adjustment planning 1 and adjustment planning 2,and adjustment scheme 2 and adjustment planning 3.In conclusion,the planning and the three adjustment plans are superior to the current land use pattern,while the optimal ecological recovery efficiency of the plan and the three adjustment planning s is the adjustment planning 1,the second is the adjustment planning 2 and the planning,and the weakest ecological recovery benefit is the adjustment planning 3.