• Title, Summary, Keyword: hydrologic condition

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An Analysis of the Effect of Climate Change on Nakdong River Flow Condition using CGCM ' s Future Climate Information (CGCM의 미래 기후 정보를 이용한 기후변화가 낙동강 유역 유황에 미치는 영향분석)

  • Keem, Munsung;Ko, Ikwhan;Kim, Sangdan
    • Journal of Korean Society on Water Environment
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    • v.25 no.6
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    • pp.863-871
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    • 2009
  • For the assessment of climate change impacts on river flow condition, CGCM 3.1 T63 is selected as future climate information. The projections come from CGCM used to simulate the GHG emission scenario known as A2. Air temperature and precipitation information from the GCM simulations are converted to regional scale data using the statistical downscaling method known as MSPG. Downscaled climate data from GCM are then used as the input data for the modified TANK model to generate regional runoff estimates for 44 river locations in Nakdong river basin. Climate change is expected to reduce the reliability of water supplies in the period of 2021~2030. In the period of 2051~2060, stream flow is expected to be reduced in spring season and increased in summer season. However, it should be noted that there are a lot of uncertainties in such multiple-step analysis used to convert climate information from GCM-based future climate projections into hydrologic information.

Vulnerability Assessment of Water Supply in Agricultural Reservoir Utilizing Probability Distribution and Reliability Analysis Methods (농업용 저수지 공급량과 수요량의 확률분포 및 신뢰성 해석 기법을 활용한 물 공급 취약성 평가)

  • Nam, Won-Ho;Kim, Tae-Gon;Choi, Jin-Yong;Lee, Jeong-Jae
    • Journal of The Korean Society of Agricultural Engineers
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    • v.54 no.2
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    • pp.37-46
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    • 2012
  • The change of rainfall pattern and hydrologic factors due to climate change increases the occurrence probability of agricultural reservoir water shortage. Water supply assessment of reservoir is usually performed current reservoir level compared to historical water levels or the simulation of reservoir operation based on the water budget analysis. Since each reservoir has the native property for watershed, irrigation district and irrigation water requirement, it is necessary to improve the assessment methods of agricultural reservoir water capability about water resources system. This study proposed a practical methods that water supply vulnerability assessment for an agricultural reservoir based on a concept of probabilistic reliability. The vulnerability assessment of water supply is calculated from probability distribution of water demand condition and water supply condition that influences on water resources management and reservoir operations. The water supply vulnerability indices are estimated to evaluate the performance of water supply on agricultural reservoir system, and thus it is recommended a more objective method to evaluate water supply reliability.

Simulating Daily Inflow and Release Rates for Irrigation Reservoirs(II) -Modeling Reservoir Release Rates- (관개용 저수지의 일별 유입량과 방류량의 모의 발생(II) -저수지 통관 방류량의 추정-)

  • 김현영;박승우
    • Magazine of the Korean Society of Agricultural Engineers
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    • v.30 no.2
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    • pp.95-104
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    • 1988
  • This study refers to the development of a hydrologic model simulating daily inflow and release rates for inigation reservoirs. A daily - based model is needed for adequate operation of an irrigation reservoir sufficing the water demand for paddy fields which is closely related to meteorological conditions. And the objective of this study is to develop a reservoir release rate model and then to calibrata the parameters. The release rates model considers daily water demands , water supply for transplanting, minmum release for maintaining canal flow, and maxirnun and regular flooding depth for determining effective rainfall on paddy fields. Each of the factors in the model was regarded as a lumped pararuter representing the average condition of a whole irrigated area. The water demand was estimated form the potential evapotranspiration by Penman method, the effective rainfall, and the infiltration on paddy fields. The release model was found to be capable of adequately simulating daily reservoir releases based on meteorological data.

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An Investigation of Hydrologic by Spring Cheju Island (제주도의 용천기구에 관한 수문학적 연구)

  • 고병련;조현경
    • Journal of Environmental Science International
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    • v.6 no.4
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    • pp.303-311
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    • 1997
  • The characteristics of spring machanism In the Cheju Island were analyzed by statistical techniques. Basic characteristics, areal and altitudinal variations, and correlations of spring data were investigated. In this study. however, the subjects of the study are the 451 springs, the whole basin of Cheju Island derided Into four groups. In this study, analyzed the spring phenomena on the basis of both the geologic elements and the topogaphic elements. Also, the spring zone In Cheju Island are classified Into three types that the mountain area, the muddle area, the coastal area in spring distribution by attitude. The quentity of spring and variability show subvariety on the average according to Meinzer's classilfication and the whole basin of spring shows various distributions from Third to Sixth. The results of this study can be utilized to evaluate the condition of groundwater development In Cheju Island.

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The research about the estimate of concentration ratio by the hydrologic condition of river watershed (하천의 수문조건에 따른 오염물질 유달율 산정에 관한 연구)

  • Ahn, Seung-Seop;Seo, Myung-Joon;Jung, Do-Joon
    • Proceedings of the Korea Water Resources Association Conference
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    • pp.2019-2022
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    • 2008
  • 본 연구에서는 유역과 점오염원, 비점오염원을 종합하고, 방대한 자료를 쉽게 적용할 수 있으며 유역의 지형적인 특성과 수리 수문학적인 특성 및 오염원의 공간적인 분포 특성을 반영하여 유달부하량의 모의가 가능한 SWAT 모형을 이용하여 낙동강 유역의 주요 지류에 대한 유달율산정에 관하여 검토하고자 한다. 본 연구의 대상지역은 낙동강 유역 중 본류가 시작되는 곳으로부터 금호강지류와 합류하는 지점까지로 선정하였으며 SWAT 모형에 적용되는 자료는 2005년 1월${\sim}$12월의 실측 자료를 이용하였다. 유달율 산정 항목으로는 BOD, T-N, T-P를 선정하였다. 분석 결과 전반적으로 강수의 영향을 많이 받는 계절에 유달율이 높게 산정되었으며 또한 유역면적 보다 유량과의 상관성이 유달율에 많은 영향을 미치는 것으로 검토되었다. 이러한 연구결과를 토대로 정확한 배출부햐량의 산정을 위하여 강우의 영향과 발생부하 원단위에 대한 지속적인 연구가 필요하다고 사료된다.

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Relationship between Wetness Index and Weathering degree of Rocks in Woogak Mounyain, Koheung-gun, Jeonnam-do (전남 고흥군 우각산 일대의 습윤지수와 암석의 풍화정도와의 상관관계)

  • Kim, Sung-Wook;Kim, Guk-Lac;Han, Ji-Young;Yoon, Won-Seop;Kim, Choon-Sik;Kim, In-Soo
    • Proceedings of the Korean Geotechical Society Conference
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    • pp.882-889
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    • 2004
  • Wetness index obtained from topography data of Woogak Mountain was compared with chemical alteration index(CAI), clay minerall contents of rock, and magnetic susceptibility changes of outcrops, and they show a close interrelationship. It is shown that the wetness index can be used as a quantitative indicator of the weathering degree of rocks. Moreover, wetness index simulate quantitatively the hydrologic condition of the local area. Therefore, it is anticipated that wetness index can be used as the data that calculate the weathering speed of rock and weathering grade in the study of weathering sensitivity of rock.

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Analysis of Hydraulic Characteristics Depending Upon the Geometrical and Discharge Condition at Channel Junctions (하도 합류부의 기하학적 특성과 유량조건에 따른 수리학적 특성 해석)

  • Ahn, Seung-Seop;Choi, Soo-Chul;Yim, Dong-Hee
    • Journal of Environmental Science International
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    • v.16 no.4
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    • pp.495-503
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    • 2007
  • In this study, we took the geometrical character of the river channel junction and hydrologic conditions as independent variables, and hydraulic behavior characteristics as an independent variable. The result, after multiple analysis was carried out, proved that, except for the generating area of the accelerating zone of velocity the accelerating zone and both the main channel and the tributary zone of stagnation the stagnation zone, there was correlation of over 90%. Also, derived presumed expression of the hydraulic characteristics of the junction was applied to the real natural channel - the river channel of the Guem-ho main channel(the A-yang bridge to the Guem-ho bridge). As the result, it proved that it represented hydraulic characteristics relatively well.

Application of Multi-Muskingum for Improving Applicability of Distributed Hydrologic Model (분포형 수문모형 적용성 개선을 위한 Multi-Muskingum 적용)

  • Cho, Hyungon;Choi, Kyuhyun;Kim, Gwangseob
    • Proceedings of the Korea Water Resources Association Conference
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    • pp.407-407
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    • 2017
  • 홍수 예측을 위한 분포형 수문모형의 유출해석에서 하도추적은 수리학적 하도 추적과 수문학적 하도 추적 방법이 있다. 수리학적 하도 추적은 운동파 방정식, 확산파 방정식 등을 이용하여 수리현상을 시간과 공간으로 편미분하여 홍수량 예측을 한다. 수리적 하도 추적은 시간적, 공간적 안정조건(stability condition)을 만족해야된다. 면적이 큰 유역에서 적용할 때에는 계산에 소요되는 시간이 크다. 그러므로 국지호우로 인한 돌방홍수 예 경보를 위해서는 준실시간 또는 실시간 홍수 감시 및 예측이 필요하므로 계산에 소요되는 시간이 큰 수리학적 하도추적을 이용한 홍수 예측은 한계를 가진다. 본 연구에서는 유역면적이 큰 유역의 준실시간 홍수 감시 및 예측을 위하여 수문학적 하도추적 기법은 하천차수별 저류상수를 적용한 multi-Muskingum방법을 개발하여 모의하였다. multi-Muskingum 적용한 결과 모의시간이 상당히 단축되었으며 자료동화 기법을 통하여 모형의 정확도를 개선하였다.

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Analysis of Small reservoir system by Flood control ability augmentation (치수능력 증대에 따른 저수지시스템 분석)

  • Park Ki-Bum;Lee Soon-Tak
    • Journal of Environmental Science International
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    • v.14 no.11
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    • pp.995-1004
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    • 2005
  • As a research establish reservoir safety operation for small dam systems. This study presents hydrologic analysis conducted in the Duckdong and Bomun dam watershed based on various rainfall data and increase inflow. Especially the Duckdong dam without flood control feature are widely exposed to the risk of flooding, thus it is constructed emergency gate at present. In this study reservoir routing program was simulation for basin runoff estimating using HEC-HMS model, the model simulation the reservoir condition of emergency Sate with and without. At the reservoir analysis results is the Duckdong dam average storage decrease $20\%$ with emergency gate than without emergency gate. Also, the Bomun dam is not affected by the Duckdong flood control augmentation.

Change of Slope Stability due to Slope Inclination and Surface Conditions (사면경사와 표면 조건에 따른 사면안정성 해석)

  • Hwang, Young-Cheol
    • Journal of the Korean Geotechnical Society
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    • v.31 no.2
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    • pp.5-11
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    • 2015
  • Slope stability is affected by duration of precipitation, probable rainfall intensity, unsaturated soil property, and soil strength. The recent analyses of slope stability tend to include unsaturated analysis based on infiltration properties of soil, while researches of unsaturated soil slope tend to include the analysis of deformation and stress distribution of soil over time. However, infiltration property of unsaturated soil slope depends not only on intensity or duration of precipitation, but also on relief and surface condition, which is not considered in status quo. This research uses hydrologic model parameters of soil in order to consider effects of inclination on filtration, and carries out analysis of unsaturated soil slope to confirm the effects according to slope inclination and surface condition. In conclusion, using slope stability analysis, the need to consider infiltration rate according to inclination and surface condition was confirmed even under the same precipitation conditions.