河北省平原区降水入渗补给系数分析

发布时间：2018-04-28 06:35

本文选题：河北省 + 降水入渗补给系数　；参考：《西北农林科技大学》2017年硕士论文

【摘要】：降水入渗补给系数是影响地下水资源评价的重要因素,能够为水资源合理开发利用规划、制定经济社会发展战略、增强水资源的可持续利用及当前开展最严格水资源管理提供技术支撑。河北省平原区30多年来地下水一直处于高强度开采状态,致使地下水位持续下降,埋深不断加大,与埋深有关的参数产生相应变化,原有数据已不能真实反映现状下垫面条件下的水资源状况。因此,对河北省水资源二次评价的成果进行必要的修订,具有非常重要理论意义和应用价值。本文选取河北省平原区为研究区,在以往研究成果的基础上,考虑近年来中东部平原区下垫面条件发生的变化,基于1991~2015年河北省平原区167眼监测井的地下水位埋深数据及相应位置的降水量数据,利用动态法计算河北省中东部平原区的次、汛期和年降水入渗补给系数,通过岩性分区,将各数据进行分类,最终确定不同岩性不同降水量等级下降水入渗补给系数与埋深关系曲线;采用水均衡法对衡水市下博水文站控制流域及沧州市沧县运西地区的年降水入渗补给系数进行分析,利用较丰富的数据资料,选取丰、平、枯典型年对研究区地下水均衡情况进行分析,分别计算区域内河渠渗漏补给量、侧向径流补给量、农田灌溉入渗补给量、浅层地下水开采量、蒸发量以及越流量。通过水均衡公式计算区域内降水入渗补给量,进而求得年降水入渗补给系数。对比典型区水均衡法与动态法计算结果,分析本次研究降水入渗补给系数;汇总不同岩性、不同降水、不同埋深条件下的降水入渗补给系数,与原有成果进行对比,合理取舍,对原有系数进行校核,分析成因,对对比结果进行修正,最终给出新一次水资源评价所需要的年降水入渗补给系数成果。最终对比典型区水均衡法与动态法计算结果,发现两种方法成果较接近,说明本次研究降水入渗补给系数较合理。本次研究的降水入渗补给系数值略小于原“38”项的分析成果,主要是因为近30年间河北省平原区包气带厚度、岩性、含水量、地表植被覆盖度、种植结构均发生了变化。
[Abstract]:The coefficient of precipitation infiltration and recharge is an important factor affecting the evaluation of groundwater resources. It can make a rational development and utilization planning of water resources and formulate economic and social development strategies. To enhance the sustainable use of water resources and the most stringent water resources management to provide technical support. Groundwater in plain area of Hebei Province has been in the state of high intensity exploitation for more than 30 years, which causes the underground water level to decrease continuously, the buried depth increases continuously, and the parameters related to the buried depth change accordingly. The original data can not truly reflect the current situation of water resources under the underlying condition. Therefore, it is of great theoretical significance and practical value to revise the results of the secondary evaluation of water resources in Hebei Province. In this paper, the plain area of Hebei Province is selected as the study area. Based on the previous research results, the changes of the underlying surface conditions in the central and eastern plain in recent years are considered. Based on the buried depth data of 167 monitoring wells in the plain area of Hebei Province from 1991 to 2015 and the precipitation data of the corresponding locations, the dynamic method is used to calculate the infiltration and recharge coefficients of the flood season and the annual precipitation in the central and eastern plain areas of Hebei Province, through the lithologic zoning. The data are classified to determine the relationship curve between infiltration coefficient and buried depth of different lithology and different precipitation grade. The water balance method is used to analyze the annual precipitation infiltration and recharge coefficients in the control basin of Xiabo Hydrologic Station in Hengshui City and the Yunxi area of Cangzhou County, Cangzhou City. The equilibrium of groundwater in the study area was analyzed in the dry typical year, and the leakage recharge, lateral runoff, irrigation, shallow groundwater exploitation, evaporation and overrun flow were calculated respectively. The water balance formula is used to calculate the precipitation infiltration recharge in the region, and then the annual precipitation infiltration recharge coefficient is obtained. Comparing the calculation results of water balance method and dynamic method in typical area, analyzing the precipitation infiltration and recharge coefficient of this study, summarizing the precipitation infiltration and recharge coefficient under different lithology, different precipitation, different buried depth, comparing with the original results, choosing and choosing reasonably, The original coefficient is checked, the cause of formation is analyzed, and the contrast result is revised. Finally, the annual precipitation infiltration and recharge coefficient for the new primary water resources evaluation is given. Finally, comparing the results of water balance method and dynamic method in typical areas, it is found that the results of the two methods are close, which indicates that the precipitation infiltration and recharge coefficient of this study is more reasonable. The value of precipitation infiltration and recharge coefficient in this study is slightly smaller than that of the original "38" item, mainly because the thickness of aeration zone, lithology, water content, surface vegetation coverage and planting structure have all changed in the last 30 years in the plain area of Hebei Province.
【学位授予单位】：西北农林科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P641

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