• 대한공간정보학회지
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• 제8권2호
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• pp.11-22
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• 2000

수자원의 효율적인 관리를 위해서는 유역에 대한 정확한 지형특성 및 수문매개변수를 추출해야 한다. 하지만, 아직까지 수문분야에서 이와 관련된 자료들이 수작업이나 간단한 연산에 의해 처리되고 있는 실정이다. 본 연구에서는 GSIS를 활용하여 유역에 대한 지형특성 및 수문관련 매개변수를 추출할 수 있는 알고리즘을 제시함으로서 자료처리 시간의 절감 및 수문자료에 대한 신뢰성을 높일 수 있었다. 그리고, 추출한 매개변수를 HEC-HMS 수문모형의 입력매개변수로 활용함으로서 GSIS와 수문모형과의 연계방향을 제시하였다. 유역별 지형특성 및 수문관련 매개변수추출 과정은, 먼저 DEM자료로부터 유역 및 하천을 추출하였고, 토지피복도과 토양도를 중첩하여 유출곡선번호(CN)을 추출하였다. 또한 유역과 하천에 격자 연산을 수행하여 최장수로 길이 및 경사와 같은 지형 매개변수를 추출하였다. 그리고 추출한 지형 매개변수와 평균 곡선번호와의 연산과정을 통해 Muskingum K와 소유역 지체시간과 같은 수문관련 매개변수를 추출할 수 있는 기법을 제시하였다.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2012년도 학술발표회
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• pp.944-944
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• 2012

Urbanization leads to a change of hydrologic responses because impervious area is increased by urbanization. Decrease of groundwater recharge and increase of overland flow are general hydrologic characteristics caused by urbanization. This can be a source of damages such as increased flooding and reduced groundwater levels. Daily streamflow in Gabcheon watershed, South Korea is simulated by ARCSWAT model, an extension of SWAT2005. After calibration and validation of model, the simulated daily streamflow from 1997 to 2001 are statistically analyzed. The phenomenon that $T_{Qmean}$ is inversly proportional to coefficient of variation for the simulated daily streamflow is demonstrated. Also, hydrologic response was more influenced by weather than land use for high flow. This study also examines the effect of land use change on daily streamflow with spatially and quantitatively different land use maps. The simulated stream flow is tested by Mann-Whitney method. The median between stream flows simulated for 1990 and 2000 land use maps is significantly different, but the simulated streamflow for spatially different land use maps is almost unchanged.

• 한국물환경학회지
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• 제36권6호
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• pp.592-610
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• 2020

In South Korea, the concept of water environment was expanded to include aquatic ecosystems with the Integrated Water Management implementation. Watershed-scale modeling is typically performed for hydrologic component analysis, however, there is a need to expand to include ecosystem variability such that the modeling corresponds to the social and political issues around the water environment. For this to be viable, the modeling must account for several distinct features in South Korean watersheds. The modeling must provide reasonable estimations for peak flow rate and apply to paddy areas as they represent 11% of land use area and greatly influence groundwater levels during irrigation. These facts indicate that the modeling time intervals should be sub-daily and the hydrologic model must have sufficient power to process surface flow, subsurface flow, and baseflow. Thus, the features required for watershed-scale modeling are suggested in this study by way of review of frequently used hydrologic models including: Agricultural Policy/Environmental eXtender(APEX), Catchment hydrologic cycle analysis tool(CAT), Hydrological Simulation Program-FORTRAN(HSPF), Spatio-Temporal River-basin Ecohydrology Analysis Model(STREAM), and Soil and Water Assessment Tool(SWAT).

• 한국농공학회논문집
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• 제53권6호
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• pp.75-84
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• 2011

The objective of this study is to evaluate the hydrologic impacts of climate and land use changes in a rural small watershed. HadCM3 (Hadley Centre Coupled Model, ver.3) A2 scenario and LARS-WG (Long Ashton Research Station - Weather Generator) were used to generate future climatic data. Future land use data were also generated by the CA-Markov (Cellular Automata-Markov) method. The Soil and Water Assessment Tool (SWAT) model was used to evaluate hydrologic impacts. The SWAT model was calibrated and validated with stream flow measured at the Baran watershed in Korea. The SWAT model simulation results agreed well with observed values during the calibration and validation periods. In this study, hydrologic impacts were analyzed according to three scenarios: future climate change (Scenario I), future land use change (Scenario II), and both future climate and land use changes (Scenario III). For Scenario I, the comparison results between a 30-year baseline period (1997~2004) and a future 30-year period (2011~2040) indicated that the total runoff, surface runoff, lateral subsurface runoff, groundwater discharge, and evapotranspiration increased as precipitation and temperature for the future 30-year period increased. The monthly variation analysis results showed that the monthly runoff for all months except September increased compared to the baseline period. For Scenario II, both the total and surface runoff increased as the built-up area, including the impervious surface, increased, while the groundwater discharge and evapotranspiration decreased. The monthly variation analysis results indicated that the total runoff increased in the summer season, when the precipitation was concentrated. In Scenario III, the results showed a similar trend to that of Scenario II. The monthly runoff for all months except October increased compared to the baseline period.

• 한국방재학회 논문집
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• 제5권3호
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• pp.29-39
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• 2005

본 연구는 도시유역인 성내와 반포배수구역과 동의대시험유역에서 수문학적 특성에 따른 임계지속기간의 변화를 구명한 것이다. 유출해석을 위한 도시유출모형으로는 RRL, ILLUDAS, SWMM과 SMADA 모형을 사용하였으며, 수문학적 특성으로는 강우의 시간분포방법, 확률강우강도식, 선행함수조건, 재현기간과 유출모형을 이용하였다. 도시유역에서 최대 첨두유량을 발생시키는 강우의 시간분포방법은 Huff의 4분위로 나타났으며, 첨두유량은 수문학적 특성에 따라 차이를 보였으나 유출모형을 제외한 수문학적 특성들은 임계지속기간에 영향을 미치지 않는 것으로 나타났다. 임계지속기간은 유출모형에 따라 차이를 나타내고 있으며, SWMM 모형에 Huff의 4분위를 적용하였을 경우 임계지속기간이 가장 크게 나타났다.

• 대한토목학회논문집
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• 제30권4B호
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• pp.389-397
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• 2010

본 논문에서는 극치수문자료의 경향성 분석 개념을 소개하고 이를 빈도해석과 연계시켜 해석하는 방법론을 제시하고자 Gumbel 극치분포를 기반으로, 시간변화에 의한 수문빈도 특성 변화를 모의할 수 있는 Bayesian 모형을 구성하였다. 사후분포의 매개변수는 깁스표본법에 의한 Markov Chain Monte Carlo Simulation을 통해 추정하였으며, 이를 통해 경향성을 고려한 확률강우량과 불확실성 구간을 추정하였다. 또한 경향성을 고려한 확률강우량이 현재 알려진 확률강우량을 초과할 확률을 통해 동적 위험도 해석과정을 소개하였으며, 현재의 경향성에 대해서 시간에 따라 연속으로 추정된 확률밀도함수를 비교하여 수문학적 위험도가 증가할 수 있음을 모의결과를 통해 확인하였다. 이와 더불어 단순히 경향성의 존재여부를 확인하는데 그치지 않고 사후분포를 통해서 통계적 추론을 수행함으로써 경향성에 대한 통계학적인 유의성을 정량적으로 평가할 수 있었다.

• 한국환경복원기술학회지
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• 제2권1호
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• pp.66-71
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• 1999

Main concern is to figure out the growth response of Pinus densiflora to hydrologic conditions in the central Korea. Continuous measurements were carried out with six trees with dendrometers in the Chungbuk National University experimental forest (Wolak-san) during 1995~1996. Surrounding hydrological conditions reflected by the solar radiation, air temperature, precipitation, soil water were included in measurements. Their effects on the biological response of trees was investigated and expressed as response functions. With these response functions, tree growth model was developed. Soil water availability was more related to the tree growth than air temperature. Limited number of biological measurements with dendrometer could permit determination of dynamics of radial tree growth to the hydrological conditions. Tree growth model could be used to check and revise the statistical transfer function of dendrohydrology.

• 한국태양에너지학회 논문집
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• 제30권4호
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• pp.86-91
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• 2010

The characteristics of hydrologic design parameters for small hydro power(SHP) sites located in four major river systems have been studied. The model, which can predict flow duration characteristic of stream, was developed to analyze the variation of inflow. And another model to predict hydrologic performance for SHP plants is established. The results from hydrologic performance analysis for SHP sites located on five major river systems based on the models developed in this study show that the specific design flowrate and specific output of SHP site have large difference between the river systems. The load factor, however, have small difference compared with specific design flowrate and specific output for all river systems. Also, it was found that the models developed in this study can be used to predict the primary design specifications of SSHP plants effectively.

• 한국태양에너지학회 논문집
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• 제29권6호
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• pp.56-61
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• 2009

The effects of design parameters for small scale hydro power(SSHP) plants due to climate change have been studied. The model to predict hydrologic performance for SSHP plants is used in this study. The results from analysis far rainfall conditions based on KIER model show that the capacity and load factor of SSHP site had large difference between the period. Especially, the hydrologic performance of SSHP site due to rainfall condition of recent period varied in design flowrate sensitively. However climate change gave small effect in load factor of existing SSHP plant. And also, the methodology represented in this study can be used to decide the primary design specifications of SSHP sites.

• Korean Journal of Hydrosciences
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• 제7권
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• pp.61-75
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• 1996

The purpose of this study is to develop an efficient model for the least cost design of multi-site detention systems. The IDP (Incremental Dynamic Programming) model for optimal design is composed of two sub-models : hydrologic-hydraulic model and optimization model. The objective function of IDP is the sum of costs ; acquisition cost of the land, construction cost of detention basin and pumping system. Model inputs include channel characteristics, hydrologic parameters, design storm, and cost function. The model is applied to the Jung-Rang Cheon basin in Seoul, a watershed with cetention basins in multiple branching channels. The application results show that the detention system can be designed reasonably for various conditions and the model can be applied to multi-site detention system design.