Hydrological Characteristics Of Seasonal Frozen Soil And The Study Of Soil Water Movement In Frozen Soil

Permafrost is a common natural phenomenon in Heilongjiang province. It has a great impact on regional climate, water cycle, water balance and so on. The frozen soil layer, from the nature of the change of soil water movement, which is completely different from the non-freezing period, caused runoff instability. To study the hydrological characteristics of the precipitation and runoff in the frozen soil region, and to analyze the characteristics of soil infiltration under the condition of frost layer will provide the basis for the rational development and utilization of water resources.In this paper, Dailing section is the research object, and collect within the Dailing, Yulin, Xingong and the Xinshuguang hydrologic stations which measured rainfall, evaporation and runoff data. Through field test and laboratory test access to data, using statistical analysis method to analyze and process the data, studying the hydrological characteristics and analyzing the condition of infiltration moisture variation characteristics under the frozen layer in this paper. The main results are as follows:First, use cumulative pitch adjustment and optimal segmentation of ordered samples to analyze precipitation and evaporation characteristics of Qinglin and Dailing stations. Second, analyze the runoff variation characteristics and variation characteristics of Qinglin, Xingong, Xinshuguang and Dailing hydrological stations. The research shows that the precipitation, evaporation and runoff in the study area present an upward trend, and the precipitation and runoff have different degrees of mutation.Through data analysis from field experiments and indoor test of Dailing district can get: during the early period of soil freezing, soil trickle down quickly in full supply of water conditions, soil infiltration rate change faster. With the increase of infiltration time, the infiltration rate tends to be balanced. In this period, due to the unstable soil layer, the change of water heat in soil layer is complicated. When the freezing depth reaches a certain amount, the infiltration rate is obviously less than that of the initialfreezing stage, but the infiltration process is similar and has obvious infiltration characteristics.By analyzing the transport characteristics of soil moisture content which based on measured data. The results showed that, in different periods(snowmelt prophase, metaphase, anaphase), soil moisture content in superficial layer changes significantly. The reason is that the existence of frozen layer leads to the change of soil water storage capacity.