• 한국농공학회논문집
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• 제64권2호
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• pp.71-83
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• 2022

In this study, an indicator and assessment system for evaluating the monthly hydrological cycle was prepared using simple factors such as the landuse status of the watershed and topographic characteristics to the dynamic water balance model (DWBM) based on the Budyko framework. The parameters a1 of DWBM are introduced as hydrologic cycle indicators. An indicator estimation regression model was developed using watershed characteristics data for the introduced indicator, and an assessment system was prepared through K-means cluster analysis. The hydrological cycle assessment system developed in this study can assess the hydrological cycle with simple data such as land use, CN, and watershed slope, so it can quickly assess changes in hydrological cycle factors in the past and present. Because of this advantage is expected that the developed assessment system can predict changes in the hydrological cycle and use an auxiliary tool for policymaking.

• 한국물환경학회지
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• 제26권2호
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• pp.243-251
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• 2010

Evapotranspiration and rainfall-runoff are the major components of hydrological cycle and thereby the changes of them can directly affect the wetness/dryness or runoff characteristics of basins. In this study the wetness/dryness in Geum river basin are classified by dint of cumulative probability density function of monthly moisture index and the long term changes of them are analyzed based on climatic water balance concept. The drought events in Geum river basin are selected through evaluation of monthly moisture index and the various hydrological properties of them are investigated in detail. Also the trends of time-series of climatic water balance components are examined by Seasonal Kendall test and the variability of hydrological cycle in Geum river basin during the recent decade is inquired. It is judged that the results of this study can be contributed to establishment of the counter plan against the future drought events as the fundamental information.

• Korean Journal of Hydrosciences
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• 제8권
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• pp.97-110
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• 1997

Quantifying water balance components is crucial to understanding the basic hydrology and hydrochemistry. An importance of water balace studies has been emphasized from the need to grasp the actual condition of water resources and environmental changes including climatic changes. This paper proposes a method for evaluating water balance components based on the vegetation monitor using remote sensing data. Here, the evapotranspiration model adopts a direct method by using NDVI(Normalized Difference Vegetation Index) calculated from NOAA/AVHRR data and a detailed descriptionof water balance by using the evapotranspiration over the Korean Peninsula. In the study, areal distribution data sets of water balance components are produced using NDVI and a simplified water balance model. This method enables one to discuss the hydrological problems for North Korea where insufficient meteorological and hydrological data exist. The results obtained indicate the specific regional features on water inventory and fluctuation in water balance.

• Water Engineering Research
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• 제6권4호
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• pp.179-187
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• 2005

This paper introduces the Cheonggye-cheon restoration project. The restoration project aims to revive the 600-year-old city of Seoul by recovering the historical heritage, guaranteeing safety from the deteriorated covering structures, creating the environment-friendly space, and revitalizing the neglected city centers. In order to understand the current hydrological cycle of the Chenggye-cheon watershed, the annual water balance of the region was calculated using the observed data including precipitation, runoff, water supply and sewage, and the changes in the groundwater level. The $2001{\sim}2002$ data were used to calibrate the WEP, and the $2003{\sim}2004$ data were used to verify the WEP. The calibration and validation results for the flood hydrograph how a reasonable value (at Majanggyo station, the R2 for the calibration period was 0.9, and that for the validation period was 0.7). According to the annual water balance of the Cheonggye-cheon watershed for 2004, the amount of surface runoff, infiltration, and evapotranspiration was 1,097mm, 216mm and 382mm, respectively, for an annual precipitation of 1,499mm. The application results from WEP, a distributed hydrological model, provide more detailed information of the watershed, and the model will be useful for improving the hydrological cycle in urban watershed.

• 물과 미래
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• 제29권5호
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• pp.203-214
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• 1996

물수지향의 정량적 평가는 수문학의 기본이 되는 중요한 개념이다. 물수지는 수자원의 실태 파악과 기후 변화를 포함한 환경 변화를 이해하기 위하여 그 중요성이 인식되고 있다. 본 논문은 인공위성 자료로부터 얻을 수 있는 식생자료를 근거로 하여 물수지향을 평가하기 위한 방법을 제안한다. 본 연구에서는 NOAA/AVHRR 자료로부터 얻어지는 식생지표 NDVI를 이용하여 직접 실제증발산량을 구하는 방법을 개발하여 그 결과로서 한반도 전역에 대한 물수지해석을 수행한다. 증발산량, 유출률, 과잉수분량과 부족수분량의 공간적 분포를 NDVI와 간략한 물수지모형으로 이용하여 얻고 있다. 이 방법을 이용함으로서 충분한 지상자료를 얻을 수 없는 북한지역을 포함한 한반도 전역에 대한 수문학적 문제의 논의가 가능하게 된다.

• Environmental Engineering Research
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• 제17권4호
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• pp.191-196
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• 2012

Analysis of hydrological safety as well as the determination of many substance concentrations are necessary when bioreactor systems are introduced to landfill operations. Therefore, hydrological and substance balance model was developed since it can be applied to various bioreactor landfill operation systems. For the final evaluation of the model's effectiveness, four different methods of injections (leachate alone, leachate and organic waste water, leachate and reverse osmosis concentrate, and all the above three combination) was applied to 1st landfill site of Sudokwon landfill. As a result, the water content of the hypothetical cases for four different systematic bioreactors is projected to be increased up to 35.5% in next 10 years, and this indicated that there will be no problems in meeting the hydrological safety. Also, the final $Cl^-$ concentration after 10-yr time period was projected to be between from minimum 126 to maximum 3,238 mg/L, which could be still a decrease from the original value of 3,278 mg/L. According to the proposed model, whether the substance concentration becomes increased or decreased largely depends on the ratio of initial quantity of inner landfill leachate and the rate of injection.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2010년도 학술발표회
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• pp.1640-1644
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• 2010

In this study the wetness/dryness in Geum river basin are classified by dint of cumulative probability density function of monthly moisture index and the long term changes of them are analyzed based on climatic water balance concept. The drought events in Geum river basin are selected through evaluation of monthly moisture index and the various hydrological properties of them are investigated in detail. Also the trends of time-series of climatic water balance components are examined by Seasonal Kendall test and the variability of hydrological cycle in Geum river basin during the recent decade is inquired. It is judged that the results of this study can be contributed to establishment of the counter plan against the future drought events as the fundamental information.

• 한국농공학회:학술대회논문집
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• 한국농공학회 2003년도 학술발표논문집
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• pp.447-450
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• 2003

It is important to calculate runoff, percolation and evapotranspiration in process hydrological cycle. Especially, a evaportranspiration in watershed has a very important effect on hydrological cycle. In the study, the watershed evapotranspiration was calculated by the water balance and a daily evaportanspiration coefficient(CE) was calculated by the modified Beken's formula.

• 한국수자원학회논문집
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• 제53권8호
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• pp.569-582
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• 2020

최근 우리나라는 도시화로 인해 수자원이용 환경이 급격한 변화를 맞이하였으며, 이로 인해 유출현상을 정량적으로 규명하여 가용수자원을 최적배분 하는데 어려움이 발생하고 있다. 이를 대비하기 위하여 국가물관리계획, 하천유역수자원관리계획 등이 제안되고 있으며, 효율적인 수자원 운영 계획 수립을 위해서는 정확하며 상세한 물수지 분석이 요구되고 있다. 그러나 기존에 수행되는 물수지 분석은 유역의 물순환 상황을 충분히 반영하지 못하며, 이러한 결과는 의사결정 측면에서 활용이 어려운 실정이다. 이러한 점에서 본 연구에서는 유역을 공간적으로 상세화하여 하천을 네트워크 형태로 재구성, 실적기반 자료를 반영한 물순환 모델을 개발하였으며, 하천을 중심으로 모니터링 지점의 유량정보가 준실시간으로 제공될 수 있는 체계를 마련하였다. 본 연구에서 개발된 물순환 모델은 기존 물수지 분석에서 나타나는 문제점을 개선하는데 목적이 있으며, 계측유역을 대상으로 모형의 적합성을 평가한 결과 특히 저유량 부분에서 기존 모형에 비해 크게 개선된 효과를 확인할 수 있었다. 본 연구에서 개발된 물순환 모델은 보다 정확한 자연유량 보정기법 적용과 유역 내 상세화된 유역네트워크를 통해 유량정보를 준실시간으로 제공함으로써 보다 현실적인 가뭄 모니터링 및 가뭄대책을 마련하기 위한 기초자료로 활용될 수 있을 것으로 기대된다.

• 한국수자원학회논문집
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• 제41권9호
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• pp.907-917
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• 2008

본 연구에서는 PRMS, SLURP, SWAT 모형을 이용하여 유출모형에 따라 수자원의 기후변화 영향평가 결과에서 발생할 수 있는 차이를 평가하였다. 이를 위해 먼저 각 모형을 안동댐유역에 적용하여 관측자료에 대한 모의능력을 비교하였다. 그 다음 기온과 강수 변화를 가정한 합성시나리오 상황에서 각 모형별 모의결과를 비교하였다. 분석결과 세 모형은 관측기간에 대해서는 관측유량에 근접한 모의를 하였다. 그러나 강수와 기온의 변화를 고려하였을 경우에는 유출량의 변화량 모의에서 각 모형별로 상이한 결과를 보였다. 특히 기온이 크게 증가할 경우 모형별 결과차이가 증가하는 것으로 분석되었는데, 이것은 각 모델에서 이용하는 증발산량 추정방법의 차이가 가장 크게 영향을 미치는 것으로 분석되었다. 따라서 이러한 불확실성을 고려한 수자원 영향평가 방법이 필요할 것으로 판단되었다.