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Advances in Civil Engineering
Volume 2018, Article ID 8727126, 9 pages
https://doi.org/10.1155/2018/8727126
Research Article

Seepage Behavior of Earth Dams Considering Rainfall Effects

1Infrastructure Research Center, K-Water Institute, 200 Sintanjin-ro, Daedeok-gu, Daejeon 306-711, Republic of Korea
2Department of Cadastre and Civil Engineering, Vision College of Jeonju, 235 Cheonjam-ro, Wansan-gu, Jeonju, Jeollabuk-do 55069, Republic of Korea
3Department of Civil Engineering, Engineering Research Institute, Gyeongsang National University, 501 Jinjudero, Jinju, Gyeongsangnam-do 52828, Republic of Korea

Correspondence should be addressed to Gi-Chun Kang; rk.ca.ung@gnakg

Received 30 March 2018; Accepted 2 May 2018; Published 15 July 2018

Academic Editor: Hailing Kong

Copyright © 2018 Jong-Wook Lee et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

More than 60% of annual rainfall in Korea is concentrated during the monsoon season from June to August because of the climate characteristics of East Asia. In general, reservoir water levels sharply rise during this period and rock-fill dams are exposed to various types of damages such as soil erosion and piping related to seepage problems. However, the detection of seepage problems is generally more difficult because rainfall directly flows into a V-notch weir according to a downstream shell in which seepage rates can be measured downstream. In this paper, rainfall is filtered out from the measured seepage rates to evaluate the effects of rainfall by using a digital filtering method for two large rock-fill dams (Dams A and B). Seepage behavior for these two large rock-fill dams was estimated as a steady-state condition. It has been proven that with the application of a digital filter which filters out rainfall-induced infiltration into a downstream shell from a measured seepage flow would make analyzing the seepage behavior of dams more effective. This also shows that consideration for any rainfall effect on the seepage behavior of earth dams is very important. The seepage rate of Dam A was not significantly affected by rainfall because the seepage water was collected inside the dam body and was transferred to a V-notch weir located downstream from the dam through a steel pipe. On the contrary, the seepage rate of Dam B was greatly influenced by rainfall in the rainy season. Also, the permeability of the core zones for Dams A and B was estimated at 8.5 × 10−5 cm/sec and 2.7 × 10−5 cm/sec, respectively, by a simplified method.