Study On The 2-D Water Temperature Vertical Model Simulation For The Stratified Reservoir

Reservoir is a water conservancy project of multi-functional,which has functions of power generation,flood routing,environmental protection and others,but also as a water head site of the industrial and agricultural Water Works and urban life Uses of Water near and downstream.However,with the rapid socio-economic development,a large number of industrial wastewater and urban sewage has not been purified and directly been discharged into rivers,reservoirs and other important water source.So that the pollutants in water are much higher than the self-purification capacity of water bodies.The water quality of rivers and reservoirs had rapidly deteriorated,which severely affected peoples life environment and social development.Study on water quality distribution of reservoir and water movement will strengthen the integrated management of the reservoir,protect environment,peoples life and property,maintain social stability.The issue analysised water thermal stratification, water dynamics in large-scale deep reservoir and operation mode,established two-Dimensional water quality model and has application in the Heihe Jinpen reservoir.The main work in this article include:(1) The water body surface temperature is in August highest,may reach 27℃,the temperature difference between water surfer level and lowest lever is also biggest,can achieves 19.46℃,the lowest level water body's temperature is also highest,and the temperature lamination is also most obvious.In June to the September is the time that water temperature difference is very obvious lamination's,ther temperature of mocline thickness changes along with surface temperature's change,and can be up to 35m in Augest,is the thickest in this four month.We can think that in August the stratification is most obvious,is stablest.(2) Along with temperature reduction,the rmocline thickness reduces gradually,at the same time,the temperature on base stagnates increase gradually,the depth of troposphere increases.In October the water temperature reduces,the phenomenon of stratification becomes gentle,prepare for the temperature decreation and the Turn over in winter.(3) Probably below the 50m water depth,the temperature change tends to be steady,and the temperature difference is small.But above 50m,the water temperature gradient is big,temperature dropping is very obviously.This can also be explained that below the 50m water depth,the illumination is very difficult to arrive,so the temperature changes because of the physical chemistry biological action is very small.(4) After the compare between empirical value and the mathematical simulation value,we find that mathematics modeling predicted value slightly small.The vertical 2-D water temperature distribution model predicted value is suit for the actual value basically,the error between predicted value and the actual value ranges between 116.6%,the average error is 4.2%,the biggest error is 16.6%,the least error is 0%, because the summer daily average temperature change is very big,generally,the 2:00 pm is the hightst temperature in a day,the surface layer water body temperature also elevates along with it,at the result,the individual error is bigger than 10%,affected the analogue result.But the computed result basically satisfies the vertical water temperature simulation requirement.