The Relationship Between The Water Surface Evaporation Scale Effect And Its Meteorological Parameters

The northwest Chinais located in the arid inland. The rainfall is scarce with high evaporation,shortage in water resources, and away from the ocean.It has typical characteristics of fragile ecological situations with serious soil and water loss.The preliminary research shows water surface evaporationis the main factor of water loss. So, it is an important part in the circulation of nature water,it is very important to study on the mechanism and influence factor of water evaporation in the area and discuss on the rules and influential factors of water surface evaporation, which played an important role to portect the water reasonably.The research area lies in the guanzhong basin,according to the measured data of the-situ observation,through investigated of the evaporation from water surface and the climate weather property of this area, and access to the vertical water tempurature distribution of observation data,analysis the relationship between water tempurature and local climate change is reviewed,it use the different depth and area evaporator, by the investigation of water temperture and evaporation, and discussed the relation between evaporation and area.The article mainly studied about the verticl temperture and scale effect of evaporation two sides:(1) The water temperature distribution is stratified in vertical of daily. When the depth approaches to the diameterofevaporator, it has the stratification trends emerging. Daily amplitude of water temperature gradually decreased and phase lagged more obviously with the increase of water depth. The atmospheric temperature and net solar radiationare the two important factors influencing the variations of solar global radiation.(2)The water high temperature is in July,thewater surface temperature more than 39℃ of all evaporator,the water lowest temperature is in December, thewater surface temperature lower than 0 ℃ of all evaporator,water temperature change similar to atmospheric temperatureinterannual variability. The meteorological elementshas strong influence on water temperature,and it was most obvious in summer. Water temperature is the greatest at the15~17h, the minimum value at the 3~5h. The water evaporation can change the environment of and around mining areas.(3)This study shows that surface area connected negatively to evaporation, the evaporatoiondecreased with the area. When every drop 1m2, the evaporation of each month to the range of 0.207 mm to 2.020 mm. Effects of area effects on evaportion can’t be ignored in the calculation of the area evaportion, area effects should be taken into accout.(4)Compare the different area evaporator and E-601 type of evaporimeter of evaporation.The maximum evaporation was in July of the 2.89m2, 4.84m2,10.24m2 evaporator and the biggest in August of the 20.25m2 evaporator. There is more evaporation over the E-601 type of evaporimeter in June, July,August.The ice age reduction factor of evaporation capacity of 2.89m2, 4.84m2, 10.24m2, 20.25m2 and E601 national standard type evaporator is 0.245, 0.219, 0.201, 0.105, respectively.