Study on the structural characteristics of riverbed lithology based on the joint inversion of multiple methods
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摘要: 河床结构探测是研究河水-地下水转化过程的关键,复杂河床结构探测过程中,单一物探方法通常精度不高。本文采用多普勒声学流速仪、地质雷达法、高密度电阻率法相结合,在淮北平原典型工作区进行河床形态和沉积物分布特征探测,构建了完整的联合反演河床岩性结构特征的技术体系,取得了较好的识别效果。结果表明:新汴河节制闸上游呈"蝶形",河床结构均匀,底泥厚度变化范围小;下游河床形态受分水坝影响起伏较大,河床形态不平整,底泥厚度为0.8~1 m;涡河处河道形态呈半椭圆形,且底泥两岸薄中间厚。韩村剖面受抽砂干扰严重,河床出现中间高两侧低的情况,底泥分布不均匀;两河口断面下存在弱透水层(粉质黏土),下方为承压含水层,其潜水含水层分布不均匀。实践证明,多种技术联合反演在河床形态探测上能够相互印证,提高成果解译的可靠性和准确性,为河水-地下水转化研究提供支撑。Abstract: The detection of riverbed structure is the key to study river-groundwater transformation. Single physical exploration method is usually of low accuracy in the detection of complex riverbed structure. This study jointly adopt Doppler acoustic velocity meter, geological radar and high-density resistivity method to investigate riverbed morphology and detect sediments distribution characteristics in the typical working area of Huaibei Plain. A complete technical system of joint inversion of riverbed lithological structure characteristics is accordingly constructed, achieving a good identification effect. The results show that: the upstream of the Xinbianhe River control gate is "butterfly-shaped" with uniform riverbed structure and small variation of sediment thickness. The shape of downstream riverbed fluctuated greatly under the influence of the sub-dam, with the sediment thickness of 0.8~1 m. The channel of Guohe River is semi-oval in shape, and the bottom mud is thin on both sides but thick in the middle. Seriously disturbed by sand pumping, the riverbed in Hancun section is high in the middle and low on both sides, resulting in uneven distribution of sediment. There is a weak permeable layer (silty clay) between Lianghekou section and a confined aquifer, and the local phreatic aquifer distributes unevenly. The practice has proved that the joint inversion of various techniques can corroborate mutually in riverbed morphology detection and improve the reliability and accuracy of results interpretation, providing support for the study of river-groundwater transformation.
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