• Journal of the Korean Association of Geographic Information Studies
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• v.18 no.4
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• pp.14-30
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• 2015

This paper attempted to analyze the hydraulic effects that the dredging can take as an alternative to reduce possible damages of flooding due to the overflow of river levee in meandering rivers, where riverbed aggradation, seepage and erosion may occur. In order to make a hydraulic analysis in a section of meandering rivers, a two-dimensional hydraulic analysis model, RMA-2, was selected. The GIS was applied to construct two-dimensional finite element grids to consider the hydraulic conditions before and after dredging. The water surface elevations, depths, velocities, and tractive forces were compared before and after the dredging. The difference of water surface elevation between the inside and outside of river was turned out to be the maximum value of 0.58m under the design flood condition. It could be evaluated that the tractive force at the bank decreased about 42 to 67% on average for all the sections. These results could give valuable information that the dredging of the stream channel at the meandering sections decreased the risk of overflow, seepage and erosion of the banks. The methodologies given in this study will contribute to mitigating the flood damages in the surrounding farmlands.

• Proceedings of the Korea Water Resources Association Conference
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• 2007.05a
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• pp.1115-1119
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• 2007

우리나라는 몬순기후대에 속하여 매년 홍수가 발생하고 이시기에 저수지로 유입된 탁수로 말미암아 저수지 인근 및 하류하천에 거주하는 주민들의 민원의 대상이 되고 있다. 이에 따라 유역, 저수지, 및 하천을 포함한 포괄적인 대책을 수립하기 위하여 유역과 저수지 그리고 저수지와 하천을 연계한 통합시스템을 구축함으로써 탁수의 거동을 고려한 저수지 운영에 대한 의사결정을 지원하고자 한다. 본 연구에서는 안동 및 임하댐의 연계운영을 통한 하류하천 탁도관리 방안을 수립하고자 동적수질모형인 Koriv1-win 모형을 구축하여 저수지 수질모의 시스템과 연계 가능하도록 하였다. 모형은 안동댐하류로부터 구미수위표 지점까지 134 km에 달하는 구간에 대하여 구축하였으며 대상구간 내에는 내성천을 비롯 5개의 주요지천이 존재하게 된다. 그림 1에는 수리모듈 및 수질모듈의 검증결과를 나타내고 있으며 탁도모의결과를 검증하기 위하여 임하댐 관리단에서 측정한 자료를 이용하였다. 수리해석결과 구미지점의 유량변동을 잘 반영하는 것으로 모의되었고 수질해석결과도 관측치와 상당히 비슷하게 나타나는 것을 알 수 있었다. 한편 안동댐방류수와 임하댐 방류수가 혼합되는 영역에서 2차원적 흐름양상과 각 댐으로부터 방류되는 방류수의 수온과 탁도의 혼합양상을 모의하였으며 실측을 통하여 모의결과와 비교해 보았다. 저수지 하류하천에 대하여 1차원 및 2차원적 수리해석과 수질해석결과를 통하여 하천에서의 탁수전파 거리 및 고탁도 탁수의 도달 시간을 산정할 수 있도록 함으로써 저수지 연계운영을 통한 하류단 탁도저감에 대한 계획수립이 가능하다.을 것으로 판단된다. 철거 선정 체계는 보 철거를 위해서 보 주변 지역 거주민을 설득하며, 하천의 환경 개선을 위한 합리적인 대안 제시를 목적으로 하고 있다. 선정 체계를 바탕으로 주민 협의 및 대안 제시를 통해 결정된 대상 보는 선정 체계 안에서 보 철거 영향 판단 절차에 따라서 보 철거로 인한 수문, 수리, 지형, 수질, 생태 영향을 판단하게 되며, 이와 더불어 사회 경제적인 영향을 평가하게 된다. 평가결과에 따라서 보를 완전히 철거하거나 다른 대안을 고려하여 보를 부분적으로 철거하거나 개량하게 된다.곳으로 1/3의 자기 생산을 담당하고 있었다. $\ulcorner$경상도지리지$\lrcorner$(慶尙道地理志)에는 $\ulcorner$세종실록$\lrcorner$(世宗實錄) $\ulcorner$지리지$\lrcorner$(地理志)와 동년대에 동일한 목적으로 찬술되었음을 알 수 있다. $\ulcorner$경상도실록지리지$\lrcorner$(慶尙道實錄地理志)에는 $\ulcorner$세종실록$\lrcorner$(世宗實錄) $\ulcorner$지리지$\lrcorner$(地理志)와의 비교를 해보면 상 중 하품의 통합 9개소가 삭제되어 있고, $\ulcorner$동국여지승람$\lrcorner$(東國與地勝覽) 에서는 자기소와 도기소의 위

• Ecology and Resilient Infrastructure
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• v.3 no.3
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• pp.182-188
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• 2016

This study evaluated structural alternatives for managing water quality problems by reinterpreting and then applying the robustness-cost index (RCI) for urban flood problems. Cases of endogenous hormone pollution in treated sewage and proliferation of protozoa in intake-water were chosen as representative examples because they have different types of regulation standards for the treatment. Current facilities and structural alternatives with robustness indices (RIs) greater than unity were determined to be robust. The RI was combined with the cost index (CI) to obtain the RCI values. For the endogenous hormone pollution in treated sewage, a human-oriented estrogen $17{\beta}$-estradiol was selected as a target pollutant. The RI and RCI values for a structural alternative, extension of the current sewage treatment facility for advanced treatment, were greater than the values for the current practice of conventional activated sludge process. For the intake-water pollution by protozoa, UV and ozone disinfection facilities were evaluated for inactivation of Cryptosporidium parvum. The RCI values for ozone disinfection were greater than those for UV disinfection. Based on the results and the logics involved in the calculation of RCI for water quality issues we studied, we proposed procedures for establishing and implementing structural alternatives for the restoration from and prevention of outbreaks of water quality problems.

• Journal of Korea Water Resources Association
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• v.41 no.7
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• pp.725-735
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• 2008

Due to recent climate change, flood damages have been increased, but it is difficult to construct large hydraulic structure for flood control such as dam because of environmental, economical and political problems. For this reason, several researches and studies have tried to use washland as an alternative of hydraulic facility. Because sizes of washlands are usually smaller than those of dams or reservoirs, there can be many available locations for washlands in a basin and proper combination of these locations can reduce flood disasters efficiently. However, in case there are many available locations for washland and many combinations to consider, it is very difficult to determine the optimal combination which yields to provide the maximum benefit. For the more, hydraulic approach that used in previous studies to calculate flood reduction effect needs a lot of time for calculation and sometimes can not give the final result. In this study, the flood reduction effect of washland is calculated by hydrologic approach and decision making model for optimal location of washland using genetic algorithm for determination of optimal solution is developed. The developed model has been applied to the Ansung River basin in order to examine the applicability and the application result shows that developed model can be used as decision making model for washland.