Distinguish from Saturated Sand and Sandy-Gravel Layers Using Seismic Exploration

• Main Authors: Tsai, Shing-De, 蔡聖德
• Other Authors: Su Miau-Bin
• Format: Others
• Language: zh-TW
• Published: 1996
• Online Access: http://ndltd.ncl.edu.tw/handle/75149399246991086157

碩士 === 國立中興大學 === 土木工程學系 === 84 === Development of the shallow-groundwater resources is considered to solve the problems of water resources for industrial and residential usage. Obviously, topography and geology have a lot of influence of forming of the shallow-groundwater system, which can be studied by coordinating the "boring log" and the "geophysical exploration" methods. Riverbed in Hsilo section of Cho-Shu river is composed of sands and sandy-gravels. Shallow- groundwater is usually exists beneath riverbed. Sandy-gravel layer with better permeability can be used as water collection system; however, electrical prospecting method cannot tell the small difference of apparent resistivity between sands and sandy-gravel layers. Therefore, the research tries to coordinate the seismic refraction method and the shallow seismic reflection method to judge the sandy- gravel layer location. In order to get better ordinary records, we had collected some data before the real research began. First, we collected related hydrogeologic information. Second, we investigated the site field in order to decide proper measuring area. Third, we estimated field structures by researching shallow field materials and by studying boring logs'' information nearby. Forth, we did noise test and decided the operation parameter and work time. After collecting all information, we organized data and made detailed analy sis to get helpful results. Coordinating the results of seismic reflection and shallow seismic reflection can not only map the interface between sand layer and sandy-gravel layer beneath the groundwater, but also draw a picture of existing water layer structure in the measured area. After discussing all related data, we think the shallow-groundwater the measured area streams toward river course from east to west beneath the loosen covering clay. Finally, we think that the way that coordinates the seismic reflection method and shallow seismic reflection method is a good technique to investigate water resources deplacement systems.