Study on the Influence of Groundwater Depth on Air Temperature in Land Surface Processes

Based on the data on the hydrological tests of typical soils in North China, this thesis probes into the relationship between groundwater environment and air temperature. Firstly, the relationships between the effect of groundwater depth, air temperature, antecedent rain and time were identified in the method for data mining based do the measured data from a certain field experiment station in North China, and a time sequence model of ground temperature was established according to the results of data mining. And according to the catastrophe theory, a groundwater-exploitation depth catastrophe model of the ground temperature was established. The thesis also explores into the criteria for determining the alteration or changes of groundwater exploitation depth and has worked out the cause and effect relationship between excess exploitation of groundwater and the catastrophe of near-surface ground temperature. Based on the high correlation between near-surface ground temperature and near-surface air temperature, the thesis comes to the conclusions that the lowering of groundwater level results in increase in near-surface air temperature, and there is a catastrophe point between the dynamic groundwater level and the air temperature, that is, the groundwater is no longer capable of regulating the air temperature when the groundwater level is lower than the catastrophe point. It is a beneficial supplement to the research of the evolution law of the groundwater environment and climate, which is very important for developing the study of groundwater.