陕北典型风沙滩地区浅层地下水动态特征及对煤炭开采响应分析

以地下水长期监测数据为基础,综合分析榆林市榆阳区萨拉乌苏组潜水区域水位动态的时空发育特征,运用模糊聚类分析法将研究区的浅层地下水划分为3个动态类型:水位强烈波动区(Ⅰ类)、水位中等波动区(Ⅱ类)、水位弱波动区(Ⅲ类)。研究不同动态类型区水位变化规律以及主要影响因素,开展地下水位动态与煤炭开采量、大气降水量的相关性分析,认为:Ⅰ类区水位动态主要受大气降水影响,水位动态变化较大;Ⅱ类、Ⅲ类区水位动态受大气降和煤炭开采的综合影响,水位动态变化较弱。在现有开采条件下,研究区区域地下水动态的主要影响因素是大气降水,其次是煤矿开采。

Shalow groundwater dynamic characteristics and response to coal mining in the typical blown-sand region of the Northern Shaanxi Province

Coal mining has great influence on the groundwater dynamic in the blown-sand region of the northern Shaanxi Province.On the basis of long-term monitoring data of groundwater table，the change characteristics of Salawusu group unconfined groundwater table regional dynamic from time and space in Yuyang district of Yulin City were analyzed comprehensively.Dynamic types of shallow groundwater table in the study area were classified into three types by Interactive Self-Organizing Data Analysis Technique (ISODATA)：the strong fluctuation area of groundwater table (Type Ⅰ)，the medium fluctuation area of groundwater table (Type Ⅱ) and the weak fluctuation area of groundwater table (Type Ⅲ).The change laws and main influence factors of groundwater table in different dynamic type areas were analyzed and the correlation analysis between groundwater table dynamic and coal mining and atmospheric precipitation was carried out.The conclusion is that the groundwater table dynamic in Type Ⅰ area，which presents a stronger fluctuation，is mainly affected by atmospheric precipitation，while the groundwater table dynamic in Type Ⅱ and Ⅲ is weaker because of the comprehensive influence of atmospheric precipitation and coal mining.Under the present mining conditions，the main influence factor of regional groundwater dynamic in the study area is atmospheric precipitation，followed by coal mining.