Geophysical Evaluation of the Inner Structure of a Historical Earth-Filled Dam

Proceedings

Krása, Josef¹  Zumr, David²  Nedvěd, Jiří³  David, Václav⁴ 

[1] Author to whom correspondence should be addressed.;Faculty of Civil Engineering, Czech Technical University in Prague, Prague16629, Czech Republic;Presented at the 3rd EWaS International Conference on “Insights on the Water-Energy-Food Nexus”, Lefkada Island, Greece, 27–30 June 2018.;SG Geotechnika, Prague15200, Czech Republic

关键词: ERT;    electrical resistivity tomography;    GPR;    ground penetrating radar;    geophysics;    seepage;    dam failure;   

DOI  :  10.3390/proceedings2110664

学科分类：社会科学、人文和艺术（综合）

来源: mdpi

【 摘 要 】

Small earth dams usually lack the detailed seepage monitoring system that would provide high resolution data on changes in seepage flow. Alternative solution is monitoring of the temperature and electrical resistivity in the body of the dams. Geophysical methods are useful techniques for a non-destructive exploration of the subsurface. We have utilized the combination of electrical resistivity tomography (ERT), ground penetrating radar (GPR) and multi-depth electromagnetical conductivity meter (CMD) techniques to observe the inner structure, especially internal failures, of the historical earth-filled dams. Longitudinal and transversal profiles of four typical fishpond dams in the Czech Republic were measured within this research. The dams were constructed as early as in the 15th century, some of them went through minor reconstruction. The aim of the application of geophysical methods for investigation of old fishpond dams was to detect and localize the boundary of the dam foundation, new earth material from the reconstruction works, cone of water depression, technical objects location, potential internal erosion, cavities, inhomogeneity in the water content pattern and any other anomalies. The primary results show that the ERT is suitable to observe the dam stratification, dam foundation, bedrock below the dam and large anomalies. GPR is suitable for small objects and anomalies detection in the shallow depths.

【 授权许可】

CC BY