• Title, Summary, Keyword: hydrologic condition

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Characteristic Analysis of Small Hydro Power Resources for River System (수계별 소수력자원의 특성 분석)

  • Park, Wan-Soon;Lee, Chul-Hyung
    • 한국태양에너지학회:학술대회논문집
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    • pp.235-240
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    • 2011
  • Small hydropower resources for five major river systems have been studied. The model, which can predict flow duration characteristic of stream, was developed to analyze the variation of inflow caused from rainfall condition. And another model to predict hydrologic performance for small hydropower(SHP) plants is established. Monthly inflow data measured at Andong dam were analyzed. The predicted results from the developed models in this study showed that the data were in good agreement with measured results of long term inflow at Andong darn. It was found that the models developed in this study can be used to predict the available potential and technical potential of SHP sites effectively. Based on the models developed in this study, the hydrologic performance for small hydropower sites located in river systems have been analyzed. The results show that the hydrologic performance characteristics of SHP sites have some difference between the river systems. Especially, the specific design flowrate and specific output of SHP sites located on North Han river and Nakdong river systems have large difference compared with other river systems.

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Characteristics of Small Hydro Power Resources for River System (수계별 소수력자원의 특성)

  • Park, Wansoon;Lee, Chulhyung
    • 한국신재생에너지학회:학술대회논문집
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    • pp.193.1-193.1
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    • 2010
  • Small hydropower resources for five major river systems have been studied. The model, which can predict flow duration characteristic of stream, was developed to analyze the variation of inflow caused from rainfall condition. And another model to predict hydrologic performance for small hydropower(SHP) plants is established. Monthly inflow data measured at Andong dam were analyzed. The predicted results from the developed models in this study showed that the data were in good agreement with measured results of long term inflow at Andong dam. It was found that the models developed in this study can be used to predict the available potential and technical potential of SHP sites effectively. Based on the models developed in this study, the hydrologic performance for small hydropower sites located in river systems have been analyzed. The results show that the hydrologic performance characteristics of SHP sites have some difference between the river systems. Especially, the specific design flowrate and specific output of SHP sites located on North Han river and Nakdong river systems have large difference compared with other river systems.

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Design Parameters of Small Hydro Power Sites for River Systems(II) (소수력발전입지의 수계별 설계변수 특성(II))

  • Park, Wan-Soon;Lee, Chul-Hyung
    • Journal of the Korean Solar Energy Society
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    • v.31 no.3
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    • pp.42-47
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    • 2011
  • Small hydropower resources for five major river systems have been studied. The model, which can predict flow duration characteristic of stream, was developed to analyze the variation of inflow caused from rainfall condition. And another model to predict hydrologic performance for small hydropower(SHP) plants is established. Monthly inflow data measured at Andong dam were analyzed. The predicted results from the developed models in this study show that the data were in good agreement with measured results of long term inflow at Andong dam. It was found that the models developed in this study can be used to predict the available potential and technical potential of SHP sites effectively. Based on the models developed in this study, the hydrologic performance for small hydropower sites located in river systems have been analyzed. The results show that the hydrologic performance characteristics of SHP sites had some difference between the river systems. Especially, the specific design flow and specific output of SHP sites located on North Han river and Nakdong river systems had large difference compared with other river systems.

Modeling Downstream Flood Damage Prediction Followed by Dam-Break of Small Agricultural Reservoir (농업용 소규모 저수지의 붕괴에 따른 하류부 피해예측 모델링)

  • Park, Jong-Yoon;Joh, Hyung-Kyung;Jung, In-Kyun;Jung, Kwan-Soo;Lee, Joo-Heon;Kang, Bu-Sik;Yoon, Chang-Jin;Kim, Seong-Joon
    • Journal of The Korean Society of Agricultural Engineers
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    • v.52 no.6
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    • pp.63-73
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    • 2010
  • This study is to develop a downstream flood damage prediction model for efficient confrontation in case of extreme and flash flood by future probable small agricultural dam break situation. For a Changri reservoir (0.419 million $m^3$) located in Yongin city of Gyeonggi province, a dam break scenario was prepared. With the probable maximum flood (PMF) condition calculated from the probable maximum precipitation (PMP), the flood condition by dam break was generated by using the HEC-HMS (Hydrologic Engineering Center - Hydrologic Modeling System) model. The flood propagation to the 1.12 km section of Hwagok downstream was simulated using HEC-RAS (Hydrologic Engineering Center - River Analysis System) model. The flood damaged areas were generated by overtopping from the levees and the boundaries were extracted for flood damage prediction, and the degree of flood damage was evaluated using IDEM (Inundation Damage Estimation Method) by modifying MD-FDA (Multi-Dimensional Flood Damage Analysis) and regression analysis simple method. The result of flood analysis by dam-break was predicted to occurred flood depth of 0.4m in interior floodplain by overtopping under PMF scenario, and maximum flood depth was predicted up to 1.1 m. Moreover, for the downstream of the Changri reservoir, the total amount of the maximum flood damage by dam-break was calculated nearly 1.2 billion won by IDEM.

A Study on Evaluation for Hydraulic and Hydrologic Safety of an Existing Dam with Morning Glory Spillway (나팔형 여수로를 가진 기존댐의 수리·수문학적 안전성평가에 관한 연구)

  • Shin, Eun-Woo;Kim, Kyung-Duk
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.8 no.2
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    • pp.269-278
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    • 2004
  • In this study, hydraulic and hydrologic safety of an existing dam with morning glory spillway was evaluated and the problems were derived in order to control extreme floods efficiently. For design flood(520cms and EL. 170.3m), the spillway was turned out to have no problem for discharge and negative pressure in vertical transition. However, the critical point for discharge starts with EL. 170.7m which transits weir flow condition to orifice flow condition and there may be negative pressure in weir crest. While maximum water level can not be greater than EL. 170.5m including freeboard according to the dam design criteria, the maximum water level based on reservoir routing was turned out to be EL. 172.46m, and fundamental measures should be requested and planned.

A Study on the Variation of the Critical Duration According to Hydrologic Characteristics in Urban Area (도시유역에서 수문학적 특성에 따른 임계지속기간의 변화 연구)

  • Lee, Jung-Sik;Shin, Chang-Dong
    • Journal of the Korean Society of Hazard Mitigation
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    • v.5 no.3
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    • pp.29-39
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    • 2005
  • The objective of this study is to analyze the relation of critical duration according to hydrologic characteristics in urban areas. RRL, ILLUDAS, SWMM, and SMADA urban runoff models were applied to the Seongnae and Banpo watershed and experiment area of the Dong-Eui University. Also, hydrologic characteristics such as temporal pattern of rainfall, rainfall intensity formula, antecedent moisture condition, return period, and urban runoff model were used to simulate the critical duration of the test areas. The results of this study are as follows; (1) The type of temporal pattern of rainfall which causes maximum peak discharge in urban area has resulted in Huff's 4th quartile distribution. (2) The critical duration in urban areas were not influenced by hydrological factors except urban runoff model. (3) Peak discharge and critical duration in urban areas were influenced by the urban runoff model, and the SWMM model using Huff's 4th quartile distribution shows maximum critical duration.

Hydrologic Performance Characteristics of Small Scale Hydro Power Site (소수력발전입지의 수문학적 성능특성)

  • Park, Wan-Soon;Lee, Chul-Hyung
    • Journal of the Korean Solar Energy Society
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    • v.27 no.3
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    • pp.135-142
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    • 2007
  • The model to predict flow duration characteristics and performance for small scale hydro power(SSHP) plants is studied to analyze the effects of rainfall condition. One existing SSHP plant was selected and performance characteristics was analyzed by using the developed model. The predicted results from the model developed show that the data were in good agreement with operational results of existing SSHP plant. The results show that both the scale parameter and the shape parameter have large effects on the performance of SSHP sites. And also it was found that the model developed in this study can be a useful tool to predict the performance of SSHP sites.

Stability Analysis of Embankment Overtopping by Initial Fluctuating Water Level (초기 변동수위를 고려한 제방 월류에 따른 안정성 분석)

  • Kim, Jin-Young;Kim, Tae-Heon;Kim, You-Seong;Kim, Jae-Hong
    • Journal of the Korean Geotechnical Society
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    • v.31 no.8
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    • pp.51-62
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    • 2015
  • It is not possible to provide resonable evidence for embankment (or dam) overtopping in geotechnical engineering, and conventional analysis by hydrologic design has not provided the evidence for the overflow. However, hydrologic design analysis using Copula function demonstrates the possibility that dam overflow occurs when estimating rainfall probability with rainfall data for 40 years based on fluctuating water level of a dam. Hydrologic dam risk analysis depends on complex hydrologic analyses in that probabilistic relationship needs to be established to quantify various uncertainties associated with modeling process and inputs. The systematic approaches to uncertainty analysis for hydrologic risk analysis have not been addressed yet. In this paper, the initial level of a dam for stability of a dam is generally determined by normal pool level or limiting the level of the flood, but overflow of probability and instability of a dam depend on the sensitivity analysis of the initial level of a dam. In order to estimate the initial level, Copula function and HEC-5 rainfall-runoff model are used to estimate posterior distributions of the model parameters. For geotechnical engineering, slope stability analysis was performed to investigate the difference between rapid drawdown and overtopping of a dam. As a result, the slope instability in overtopping of a dam was more dangerous than that of rapid drawdown condition.

Redetermining the curve number of Korean forest according to hydrologic condition class (수문학적 조건 등급에 따른 우리나라 산림의 유출곡선지수 재산정)

  • Park, Dong-Hyeok;Yu, Ji Soo;Ahn, Jae-Hyun;Kim, Tae-Woong
    • Journal of Korea Water Resources Association
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    • v.50 no.10
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    • pp.653-660
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    • 2017
  • The SCS-CN (Soil Conservation Service-Curve Number) method has been practically applied for estimating the effective precipitation. The CN is used to be determined according to the land use condition based on the US standard. However, there are two distinctive differences between U.S. and Korean land use conditions: mountainous (forest) and rice paddy area that cover more than 70% of the Korean territory. The previous work proposed to use 79 for rice paddy area, regardless of the soil type. Because US SCS's goal was originally to increase crops, the SCS classification standard provides only for woods and there are no criteria to distinguish the wood and forest. To determine the CN for forest, alternatively the U.S. Forest Service criteria have been employed in practice considering hydrologic condition class. In this study, we investigated the change of the forest CN using the observed rainfall - runoff data within the target area. The results indicated that the CN for forest was suitable for HC=1, and the corresponding CNs were redetermined between 54 and 55.

Watershed-scale Hydrologic Modeling Considering a Detention Effect of Rice Paddy Fields using HSPF Surface-Ftable (논의 저류효과를 고려한 유역수문모델링 - HSPF Surface-Ftable의 적용 -)

  • Seong, Chounghyun;Oh, Chansung;Hwang, Syewoon
    • Journal of The Korean Society of Agricultural Engineers
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    • v.60 no.5
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    • pp.41-54
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    • 2018
  • A method to account a detention in a rice paddy field in hydrologic modeling was tested at plot and watershed scales. Hydrologic Simulation Program - Fortran (HSPF) and its one of surface runoff modeling method, i.e Surface-Ftable, were used to simulate a inundated condition in a rice paddy culture for a study plot and basins in Saemangeum watershed. Surface-Ftable in HSPF defines surface runoff ratio with respect to surface water depth in a pervious land segment, which can be implemented to the feature of water management in a rice paddy field. A Surface-Ftable for paddy fields in Saemangeum watershed was developed based on the study paddy field monitoring data from 2013 to 2014, and was applied to Jeonju-chun and Jeongeup-chun basins which comprise 12% and 22% of paddy fields in the basins, respectively. Four gaging stations were used to calibrate and validate the watershed models for the period of 2009 and 2013. Model performed 7.13% and 9.68% in PBIAS, and 0.94 and 0.90 in monthly NSE during model calibrations at Jeonju and Jeongeup stations, respectively, while the models were validated its applicability at Hyoja and Gongpyung stations. The comparison of results with and without considering detention effect of paddy fields confirmed the validity of the Surface-Ftable method in modeling watersheds containing rice paddy fields.