论文部分内容阅读
为了分析黄河三角洲地下水动态及其与地面沉降的关系,利用多年地下水和地面沉降监测数据,发现黄河三角洲广饶县和东营区的地下水动态变化剧烈且地面沉降严重,含水层多处于超采状态,浅、深层地下水降落漏斗先后出现.深层地下水降落漏斗中心水位下降速度达2~3m/a.近年来,东营和广饶地面沉降漏斗中心沉降量和速率分别为155.1mm、28.2mm/a和356.0mm、64.7mm/a.借助GIS技术及数理统计法,发现深层地下水降落漏斗与沉降漏斗空间耦合良好,深层地下水位与地面高程呈线性正相关,相关系数为0.92,深层地下水过度开采已成为影响沉降的最根本因素.井灌区第三粘性压缩层成为地面沉降主要贡献层,且深层地下水降落漏斗中心的地下水位已低于第三承压含水层临界水位,沉降趋于严重.
In order to analyze the relationship between groundwater movement and ground subsidence in the Yellow River Delta, groundwater and land subsidence monitoring data from many years were used to find that groundwater in Guangrao County and Dongying District of the Yellow River Delta had severe dynamic changes and severe ground subsidence. , The deep underground waterfall funnel successively appeared.The deep groundwater descent funnel center water level descended to 2 ~ 3m / a.In recent years, the settlement and the rate of the ground subsidence funnel in Dongying and Guangrao were 155.1mm, 28.2mm / a and 356.0mm, respectively, 64.7mm / a. By means of GIS and mathematical statistics, it was found that there is a good linear correlation between the deep groundwater fall funnel and the settlement funnel space. The correlation between the groundwater table and the ground elevation is linearly correlated with a correlation coefficient of 0.92. Deep groundwater over-exploitation has become the influencing factor The most important factor is that the third viscous compression layer in well irrigation area becomes the main contribution layer of ground subsidence, and the groundwater table in the center of deep groundwater fall funnel is lower than the critical water level of the third confined aquifer, and the settlement tends to be serious.