| The drinking water of residents in Beilin District of Suihua is supplied by underground water wells,the water supply capacity of which is dangerous.In addition,with the rapid development of industry and the number of urban residents,the consumption of production and domestic water of Beilin District is gradually increased.By 2025,the water supply source of Beilin District will not be able to meet the water demand.The water diversion project in Beilin District of Suihua will divert the transit water resource of Hulan River as the standby water source.The surface water intake project is beneficial to industrial and agricultural production,especially to the realization of the goal of"100 billion jin grain plan"in Heilongjiang Province.However,the construction of water intake project will also bring about the change of the original surface water hydrological environment,and then bring about the change of water environmental quality.To address the continuous decline of groundwater level due to the continuous mining of groundwater,systematic study will be provided for the impact on hydrology and environmental quality by the rational development and utilization of surface water resources.First of all,the influence of hydrological regime on Hulan River was studied by hydrological regime simulation.The research results showed that the months which had great influence on the hydrological regime of the downstream of the water intake were concentrated in the ice period(from November to March of the next year),and the reduction range was between 5.2%and 59.1%.February was the most influential month,and the variation range was-59.1%.The water intake of the project in the ice period had a certain impact on the hydrological situation of Hulan River downstream.However,in the non flood season and flood season from April to October,the hydrologic situation in the water intake of Hulan River downstream decreased by less than 4%for the project operating,and therefore the water intake of the project had little impact on the hydrologic situation.Secondly,the Tennant method and the minimum monthly average runoff method were adopted to calculate the amount of the aquatic ecological water demand.From November of this year to March of the next year,the aquatic ecological water demand was 1.003 m~3/s,and the corresponding water demand was 18.32 m~3/s in the non-flood season from April to June or October,while 45.77 m~3/s in the flood season from July to September.In the above three different periods,the ecological flow of Hulan River in the downstream of the water intake could be satisfied during the project operating.Finally,according to the data from the monitoring of the surface water quality of Hulan River and the results of the eutrophication simulation,the simulation result of the total phosphorus concentration in the sandpit storage tank laid outside the embankment of this project was 0.105 mg/L(E was calculated to be 50.50 using interpolation method).The simulation result of total nitrogen was 0.694mg/L(E was calculated to be53.88 using interpolation method).According to the above formula,EI was calculated to be 52.19,and the nutritional state is"light nutrient type".Therefore,the possibility of eutrophication was low according to the nutrient level,geographical location and operation mode of the project.The paper can provide the guidance for environmental management departments who control environmental quality according to the change of surface water hydrological situation,and be also used as reference for the scientific research of related environment. |
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