• Journal of the Korean Association of Geographic Information Studies
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• v.6 no.3
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• pp.129-138
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• 2003

A new methodology for selecting spatially variable model control parameter values through consideration of inference models within a Hydroinformatic system has been developed to overcome problems associated with determination of spatially variable control parameter values for both ungauged and gauged catchment. The adopted Hydroinformatic tools for determination of control parameter values were a GIS(Arc/Info) to handle spatial and non-spatial attribute information, the SWMM(stormwater management model) to simulate catchment response to hydrologic events, and lastly, L_BFGS_B(a limited memory quasi-Newton algorithm) to assist in the calibration process. As a result, high accuracy of control parameter estimation was obtained by considering the spatial variations of the control parameters based on landuse characteristics. Also, considerable time and effort necessary for estimating a large number of control parameters were reduced from the new calibration approach.

• Journal of the Korean Association of Geographic Information Studies
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• v.7 no.2
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• pp.87-96
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• 2004

When watershed spatial database is constructed from DEM, hydrological geographic characteristics of watershed can be easily extracted. And the characteristics can be assigned and managed as the attribute of spatial database. In this study the scheme of constructing framework spatial database which is basic information for managing watershed information is examined. We established framework spatial data and defined the relationship of the data. And framework spatial database of test site was constructed. In this study, HyGIS(Hydrological Geographic Information System) which is developed by domestic technology for making hydrological spatial data and developing water resources system is used. Hydrological geographic characteristics and spatial data is extracted by HyGIS. And the data from HyGIS is used for constructing framework spatial database of test site. Finally, this study suggests the strategy of constructing framework spatial database for developing watershed management system based on river network.

• Proceedings of the Korea Water Resources Association Conference
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• 2005.05b
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• pp.1169-1173
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• 2005

자연현상의 강우와 유출관계를 규명하는 일은 상당히 복잡하고 어려우며 대부분의 하천이 충분한 수문정보가 부족하기 때문에 수문학적인 문제의 해결을 위한 보다 정확하고 신속한 방법이 필요하다. 지리정보시스템 (Geographical Information Systems; GIS)은 강우-유출 등 수문학적 모델링에 있어서 많은 새로운 방법을 연구할 수 있다. 우리나라 소하천 유역은 아직 수위나 유량 관측이 행해지지 않은 미계측유역이 있어 홍수시 정확한 유출량 추정이 어려운 실정이다. 이에 본 연구에서는 GIS와 WMS를 이용하여 지형특성인자값을 산정하고, 유역특성인자들을 IHP 대표유역인 설마천 유역에 적용하여 DEM 격자크기별 지형특성인자값을 비교하고, HEC-HMS 수문모형을 이용하여 유출수문곡선을 모의하고 이 결과와 실제 수문곡선과의 비교를 통하여 설마천 유역의 적정한 DEM 격자크기를 결정해 보고자 한다.

• Proceedings of the Korea Water Resources Association Conference
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• 2006.05a
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• pp.1797-1801
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• 2006

수문모형은 많은 물리적, 식생적, 기후적, 인위적 요소들의 결과로 기인하는 수문학적 특성을 나타내는 유역의 복잡한 시스템을 현실적으로 표현하는 도구로써 인식되어 왔다. 공간적으로 분포된 수문모형들은 1960년대 처음으로 개발되었으며, 수문학과 수자원관리 분야에서 원격탐사데이터와 지리정보시스템의 그 역할은 급속도록 증가하였다. 비록 원격탐사자료가 수문학분야에 실제 적용된 경우는 매우 적지만, 그 효용성은 크다고 할 수 있다. 수문 모델링과 모니터링분야에서 원격탐사 자료를 이용함에 있어 가장 큰 장점 중의 하나는 시공간적인 정보를 지속적으로 생산할 수 있게 되었다는 점이다. 이와 같은 능력은 성공적인 모형의 분석과 예측, 검증을 위한 작업에 필수적이다. 본 연구는 준 분포형 수문학적 모형인 SLURP 모형을 경안천 유역을 대상으로 적용하였으며, MODIS 위성영상을 이용하여 제작한 엽면적지수(LAI), 정규식생지수(NDVI)를 수문모형의 입력자료로 활용하여 경안 수위표 지점에서 일 유출량 모의를 실시하였다. 또한, 각각의 원격탐사 자료가 모의된 증발산량의 민감도에 어떤 영향을 미치는 가를 분석하였다.

• Spatial Information Research
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• v.14 no.1 s.36
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• pp.15-27
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• 2006

This paper is about the threshold discharge computation using GIUH(Geomorphoclimatic Instantaneous Unit Hydrograph) on ungauged small basin. GIUH is one of the possible approaches to predicting the hydrograph characteristics. This study is calculated the various ways which are hydrologic characteristics, bankfull flows, unit peak flows(the Clark, the Nakayasu and the S.C.S) as well as threshold runoffs on about $5km^2$ scale at Kyungbuk gampo in subbasin. We are estimated propriety that peak discharge calculated the GIUH from acquiring data by GIS(Geographic Information System) compared to observed peak discharge. And, the threshold discharge was calculated by NRCS(Natural Resources Conservation Service) for a flash flood standard rainfall.

• Spatial Information Research
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• v.7 no.1
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• pp.103-117
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• 1999

During the last several years, the geographic information system(GIS) technology has emerged as a very effective tool for analyzing complicated groundwater system Linking GIS to spatially distributed hydrogeological data and groundwater models offers many advantages in the analysis of urban groundwater system. This paper describes the urban hydrogeological application of GIS in Seoul area. This study constructs an urban hydrogeological database via pre- and post-processing of various types of urban hydrogeological data, such as groundwater-level fluctuation, topogaphic data, water chemistry data, subway pimping station data, tidal effect of the Han River, and hydrogeological parameters. A hydrogeological model has been designed to enable importing data from the database and providing the model output for the repetitive manipulation and display in GIS.

• Journal of the Korean Association of Geographic Information Studies
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• v.9 no.2
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• pp.144-159
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• 2006

Hydrological models are tools intended to realistically represent the basin's complex system in which hydrological characteristics result from a number of physical, vegetative, climatic, and anthropomorphic factors. Spatially distributed hydrological models were first developed in the 1960s, Remote sensing(RS) data and Geographical Information System(GIS) play a rapidly increasing role in the field of hydrology and water resources development. Although very few remotely sensed data can applied in hydrology, such information is of great. One of the greatest advantage of using RS data for hydrological modeling and monitoring is its ability to generate information in spatial and temporal domain, which is very crucial for successful model analysis, prediction and validation. In this paper, SLURP model is selected as semi-distributed hydrological model and MODIS Leaf Area Index(LAI), Normalized Difference Vegetation Index(NDVI) as Remote sensing input data to hydrological modeling of Kyung An-chen basin. The outlet of the Kyung An stage site was simulated, We evaluated two RS data, based on ability of SLURP model to simulate daily streamflows, and How the two RS data influence the sensitivity of simulated Evapotranspiration.

• Proceedings of the Korea Water Resources Association Conference
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• 2007.05a
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• pp.1608-1613
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• 2007

최근들어 수자원 분야에서 GIS(Geographic Information System)의 활용에 대한 많은 연구가 이루어지고 있다. 수자원 관련 분야에 있어서 GIS는 수문현상에 영향을 미치는 기상학적인 요인, 토양, 토지이용도, 배수 유역의 형태 등 수문정보를 획득하기 위한 수단으로 사용될 수 있을 뿐만 아니라, 유역에서의 지형학적, 기후학적 특성을 시간과 인력을 절약하여 정량화할 수 있다는 것이 입증되고 있다. 하천에서의 유출량 추정은 강우, 수위와 같은 수문데이터의 신뢰도에서 많은 문제점이 야기되고 있다. 따라서 모의 입력매개변수의 중요요소인 지형정보의 경우 GIS 기법을 이용할 경우 기존 방법과는 달리 신뢰성 있는 정보를 획득할 수 있으므로 모형의 결과를 개선하는 데 도움이 될 것이다. 본 연구에서는 미국의 Environmental Modeling Research Laboratory(EMRL)에서 개발한 지리정보시스템과 수문유출모형이 접목된 WMS(Watershed Modelling System) 모형을 HEC-1 모형과 연계하여 낙동강수계 제1지류인 회천유역 개진1, 개진2 지점의 유출 해석을 실시하였다. GIS와 결합된 홍수유출모형인 WMS를 이용하여 유역 내의 지형특성인자 및 하천망을 추출하였으며, 유출해석은 WMS에 내재된 HEC-1을 이용하였다. 유효강우량의 산정을 위해 SCS CN 값을 사용하였으며, CN 계산을 위해서는 토지이용도 토양도를 이용하였다. 합성단위도법은 SCS 무차원 단위도법을 사용하여 유출을 모의하였다.

• Journal of Korea Water Resources Association
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• v.32 no.2
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• pp.163-176
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• 1999

Hydrology-based topographical informations generated by GIS techniques could be changed according to the selection of base map, algorithm of extraction, and so on. The purpose of this paper is to investigate the variation of SCS CN extracted by GIS technique and to propose the effective strategy for applying GIS to the rainfall-runoff simulation in ungaged basin. For experimental implementation, GIS spatial data, such as reconnaissance soil map, detailed interpretative soil map, landuse planning map and remotely sensed data(Landsat TM), were collected and generated to calculate the amount of effective rainfall in Pyungchang river basin. In applying SCS Runoff Curve Number to the test basin, the hydrological attribute data were analyzed. In addition, the characteristics of runoff responses according to the selection of GIS spatial data for SCS CN were reviewed. This study shows the applicability of GIS techniques to runoff simulation in ungaged basin by comparing with the measured flood hydrograph. It has been found that the detained interpretative soil map and remote sensing data are appropriate for calculating of SCS CN.

• Water for future
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• v.29 no.6
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• pp.203-215
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• 1996

A physically based model for rainfall-runoff simulation in agricultural watersheds equipped with tile drains is developed from the TOPMODEL framework. The model is based on detailed topographical information provided by the Digital Elevation Model (DEM), which is available in the Geographic Information System GRASS. Nine possible flow generation scenarions are suggested and used in the development of the model. The storage and delaying effects in the soil matrix and in the tile system are simulated with a second order linear reservoir. The model can identify the portions of the hydrators resulting from tile flow, subsurface flow and surface runoff.