• Title/Summary/Keyword: construction of reservoir

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Water Quality Assessment for pre and post-Impoundment of 6 Multipurpose Dam Reservoirs in Korea (국내 6개 다목적댐 저수지의 담수 전·후 수질 비교평가)

  • Park, Jae-Chung;Shin, Jae-Ki;Song, Young-Il;Jeong, Yong-Moon;Song, Sang-Jin
    • Journal of Environmental Impact Assessment
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    • v.20 no.1
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    • pp.89-96
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    • 2011
  • This study was carried out to assess the variations of water quality caused by the dam construction on the river. Six dams-Yongdam, Miryang, Hoengseong, Boryeong, Jangheung and Buan- constructed recently in Korea were selected for the study. Chemical oxygen demand(COD) was increased in the initial stage of water storage at dams compared to the lotic(river) environment, but after 3 years it was maintained lower and stabilized concentrations. Five dams except for Jangheung Dam were maintained Ia~Ib grade conditions under the water quality criteria of Korea. The concentrations of total nitrogen(T-N) were decreased under the lentic(reservoir) environment compared to the river status. Total phosphorus(T-P) was decreased 13~63% at the reservoir condition. We concluded that increase of COD concentration was due to the debris organic materials of the land, but temporary phenomenon. T-N and T-P concentrations were decreased at the lentic condition compared to the lotic.

A Study on the Typology of Agricultural Reservoir for Effective Safety Inspection Systems (효율적인 안전진단 체계 수립을 위한 농업용 저수지 유형화 연구)

  • Lee, Chang Beom;Jung, Nam Su;Park, Seong Ki;Jeon, Sang Ok
    • Journal of The Korean Society of Agricultural Engineers
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    • v.57 no.5
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    • pp.89-99
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    • 2015
  • In this research, 1,032 data of precise safety inspection from 2004 to 2013 are gathered and constructed for finding effective safety inspection systems. Items are extracted from constructed data and factors for typology are decided with statistical method such as principle component analysis and cluster analysis. For factor decision, we extruded independent characteristics such as morphological and geographical characteristic, and deleted items which can be expressed by combination of independent characteristics. Four factors such as total storage, watershed ratio, levee length ratio, and spillway length ratio are extracted in this process. In cluster analysis, levee length ratio is excluded because it is not separated as cluster. Finally nine types of agricultural reservoir are extruded by total storage, watershed ratio, and spillway length ratio with frequency analysis.

A Study for Storage Reallocation of Multipurpose Reservoir(II) - Conservation Storage Analysis (다목적댐 용량 재할당에 대한 연구(II)- 이수용량 분석)

  • Yi, Jae-Eung;Kwon, Yong-Ik
    • Journal of Korea Water Resources Association
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    • v.37 no.4
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    • pp.283-292
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    • 2004
  • In the past, it was unnecessary to consider the reallocation of reservoir storage because new reservoir construction was relatively not difficult. However, it became necessary since it is so difficult to construct new reservoirs in these days. In this study, the change of the water supply capability is evaluated through conservation storage drawdown frequency analysis, hydropower analysis, reliability, resiliency and vulnerability analyses for Geum River basin. As a result, it is confirmed that water supply capability of Daechung reservoir can be increased by reallocating flood control storage to conservation storage.

Change of Flood Characteristics in the Down Stream of Keum River after the Ken River Estuary Dam Construction (금강하구언 건설후 금강하류의 홍수흐름특성변화)

  • 박승기;문종필;민진우;김태철;안병기
    • Proceedings of the Korean Society of Agricultural Engineers Conference
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    • 1998.10a
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    • pp.41-46
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    • 1998
  • The purpose of the study was changed of Flood Characteristics in Down stream of Keum River by the Keum River Estuary Dam Construction. The water surface slope of Kuem river after the Keum River Estuary Dam construction was steeper then before. The flood control capacity increase after construction. But, Increasing sediment in Kuem river will be decreased flesh reservoir volume for yield irrigation.

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ECO-Friendly Reservoir Tank Management using Prediction for Improved Water Quality (수질향상을 위해 예측을 이용한 환경 친화적인 저수조 관리)

  • Chung, Kyung-Yong;Jo, Sun-Moon
    • The Journal of the Korea Contents Association
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    • v.9 no.6
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    • pp.9-16
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    • 2009
  • According to the construction of infrastructure for the water resource management services, the importance of the eco-friendly reservoir tank management is being spotlighted. In this paper, we proposed the eco-friendly reservoir tank management using prediction for improving the water quality and on-line managing efforts of reservoir tanks. The proposed method defined the context and environment of the reservoir tank and predicted the profited service according to the pump motion, the solar battery, the chemicals, the water level, the telephone line, and the modem using collaborative filtering. To evaluate the performance of the eco-friendly reservoir tank management system using prediction, we conducted sample T-tests so as to verify usefulness. This evaluation found that the difference of satisfaction by service was statistically meaningful, and showed high satisfaction. Accordingly, the satisfaction and the quality of services will be improved the efficient prediction by supporting the context information as well as the environment information.

Application of the Determination Method of Monitoring Location in Real Water Distribution System (실제 상수관망에 대한 모니터링 지점선정방법의 적용)

  • Park, Yong-Gyun;Jung, Sung-Gyun;Kwon, Hyuk-Jae
    • Journal of Korean Society of Water and Wastewater
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    • v.29 no.6
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    • pp.617-623
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    • 2015
  • In this study, determination methods of monitoring location in water distribution system were suggested and applied to real test bed. Small block of Gwangtan water distribution system is consisted of 582 pipes, 564 junctions, 1 reservoir, and 1 pump station. Small block of Ho Chi Minh water distribution system is consisted of 162 pipes, 148 junctions, and 1 reservoir. Two small block water distribution systems were analyzed by pressure contribution analysis method to determine the optimum monitoring locations. The pressure change was estimated at each junctions by the additional demand at a junction. From the results, the optimum monitoring location can be determined by rank of pressure contribution index at each junctions due to demand change at a junction.

'Design and Construction of 7 kilometres of 2.5 cubic metre per second Canal'

  • Euinton, Gordon;Tate, Don
    • Proceedings of the Korea Water Resources Association Conference
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    • 2008.05a
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    • pp.1-8
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    • 2008
  • The paper describes the process and issues encountered during the design and construction of seven kilometres of canal to convey 2.5 cumecs of flow to two power stations. The location of the scheme above the primary reservoir of the Waipori Hydropower scheme in Otago, New Zealand, utilising an existing stream diversion into this reservoir, means that no new water abstraction or diversion consents were required. This mini hydro development associated with the existing Waipori scheme was partly justified by an allocation of carbon credits. The scheme controls are slightly more complicated than many canal and penstock schemes as the canal lengths are considerable in relation to the gradient.

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PRELIMINARY PROJECT OF WATER SUPPLY FOR NDATA FARM, MALAWA

  • Min-Shun Lee;Hung-Kwai Chen;Sheng Liang;Ho-Shong Hou
    • International conference on construction engineering and project management
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    • 2009.05a
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    • pp.1615-1617
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    • 2009
  • The water resources project of 320 Ha second stage reclamation, in which including an University City, out of 800 Ha Ndata Farm, Malawa, had been under studied in this research. The challenge of C value of runoff coefficient was obtained as 0.8, by introducing the attenuation factors method, proposed by second author, an IDF dimensionless method customary used in Taiwan, proposed by the third author, is translated further to solve the project design rainfall; Rational Method, thus, obtains 11.5 CMS as the 5 year recurrence storage. The final job, completed by the third author's on-site performance, includs field alignments and discussions with the trustee, Malawa President H. E. Dr. Bingu Wa Mutharika, when a special concern of anti-theft. In order to provide sufficient supply up to an amount of 44,000 M3 during April to November, the sketch package includes 6 measurements: one water barrage, one sluice gate, one intake, one sediment reservoir, one water reservoir, and 3199 Km long gravity-driving hydraulic pipe.

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A Study on the Variation of Suspended Sediment Concentration in the Reservoir due to a Rainstorm (호우발생시 저수지 유입 부유사농도의 변화특성 연구)

  • Jang, Su-Hyung;Park, Moo-Jong;Yoon, Yong-Nam
    • Journal of Korea Water Resources Association
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    • v.37 no.1
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    • pp.43-54
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    • 2004
  • The objective of this study is to propose reservoir operation method in relation to the suspended sediment concentration due to rainstorms. Present analysis is made for the Tamjin reservoir which is under construction. For the hydrologic computations the Huff rainfall distribution, Clark unit hydrograph method and Puls reservoir routing method are used. The variation of suspended sediment concentration is calculated by 2-dimensional RMA-4 model. As a result of this study, the possible intake time from the reservoir under low frequency flood is estimated and the rainfall-ret urn period - possible intake time relationship is established, which is very important in maintaining the water quality standard when supplying water from the reservoir for different utilizationurn period- possible intake time relationship is established, which is very important in maintaining the water quality standard when supplying water from the reservoir for different utilizations.

Dynamic Response of Hydraulic Characteristics in the Inner Saemankeum Reservoir According to Gate Operation and Flood Events (홍수전파와 배수갑문 운영에 따른 새만금호 내부 수리특성의 동적응답)

  • Suh, Seung-Won;Cho, Wan-Hei
    • Journal of Korean Society of Coastal and Ocean Engineers
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    • v.17 no.4
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    • pp.269-279
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    • 2005
  • Numerical simulations were done using depth integrated ADCIRC model in order to evaluate dynamic response on the inner Saemankeum reservoir due to flood flow and gate operation for the both situations of dike construction and inner development. According to 2-dimensional dynamic flood routing, temporal variation of hydrographs shows sensitive at upstream riverine region while it becomes stable from the center part of the reservoir due to sudden expansion of physical changes. Dynamic response of hydraulic changes such as water surface elevation and velocity on the inner region arises suddenly by gate operation and more rapidly after the inner development than dike construction. Temporal surface fluctuation arises during inflowging of outer sea water and propagates upstream up to 10km to 16km in accordance with inner development status.