| Tao River is the first branch of the Yellow River,Tao River Basin water resources development play an important role in supporting the national economy and social development.Tao River basin cascade development led the economy quickly develop,at the same time,but also bring ignore the impact of environment,river cascade hydropower group in addition to individual water conservancy projects lead to environmental problems,but also has the cumulative and potential.In order to ensure the health of the river,adhere to the principle of ecological priority,scientific way to carr y out the orderly development of the basin resources,to create more value for mankind,to carry out the cumulative environmental impact assessment work is urgent and necessary.This paper summarizes the environmental impact analysis and prediction of the Tao River Mainstream(Lintan ~ Zhuoni)after extensive environmental impact assessment of experts and scholars at home and abroad.This paper analyzes the current situation of water environment,ecological environment and social environment in the evaluation area by using GIS technology,scene analysis method,analogy method and expert judgment method,and analyzes the current situation of Taohe River(Lintan ~ Zhuoni)Year for the second time in the evening,2025 assessment of the regional environmental cond itions of the evolution of the trend.The results are as follows:(1)The development of river basin has caused the change of river hydrological situation and changed the water environment characteristic.First of all,the runoff of the river basin caused the change of annual runoff,and the measured value of runoff in 2015 increased by 1.253 billion m~3.The distribution of runoff is uneven during the year,and the difference between runoff and dry season is different;Secondly,the construction of cascade hydropower station makes the evaluation of regional water quality deterioration,the surface water environment in 2015 meet the V standard,water quality decline,when the pollutant exceeds the water environment carrying capacity limit,there may be induced threshold effect;Finally,the evaluation of the regional water temperature stratification phenomenon,the power station capacity is small,the prediction of water temperature stratification phenomenon will not interfere with the downstream river biological normal reproduction,growth.(2)The continuous construction of the regional cascade hydropower station to break the landscape integrity,through GIS technology and the scene analysis method,analysis of the 2015 project caused by habitat damage to the en tire area of the impact of greater than 0.8,said the project generated habitat damage to the whole The cumulative impact of the region is very small,and it is predicted that the cumulative impact of habitat damage on the whole area in 2025 will only incr ease in the existing extent and scope.However,the construction of the power station will cause serious soil erosion.The total soil and water loss 52284.21 t in the year of 2015,of which the total amount of soil and water loss in the spoil is 49785 t.It is predicted that the soil and water loss caused by the spoil of the planned power station in 2025 will be the main reason of soil and water loss.(3)In view of the existing environmental problems in the river basin and the evolving trend in a certain period of time,the cumulative impact protection and restoration measures are put forward,and a management system suitable for the healthy development of the Tao River Mainstream(Lintan ~ Zhuoni).This paper chooses the representative Taohe River(Lintan ~ Zhuoni)as the research object in the northwest region,which enriches the connotation of the cumulative environmental impact assessment and plays a guiding role in the future planning of the Tao River Basin. |
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