• Journal of Wetlands Research
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• v.17 no.4
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• pp.348-358
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• 2015

Impacts of climate change are being observed in the globe as well as the Korean peninsula. In the past 100 years, the average temperature of the earth rose about 0.75 degree in celsius, while that of Korean peninsula rose about 1.5 degree in celsius. The fifth Assessment Report of IPCC(Intergovermental Panel on Climate Change) predicts that the water pollution will be aggravated by change of hydrologic extremes such as floods and droughts and increase of water temperature (KMA and MOLIT, 2009). In this study, future runoff was calculated by applying climate change scenario to analyze the future water quality for each targe period (Obs : 2001 ~ 2010, Target I : 2011 ~ 2040, Target II : 2041 ~ 2070, Target III : 2071 ~ 2100) in Hongcheon river basin, Korea. In addition, The future water quality was analyzed by using multiple linear regression analysis and artificial neural networks after flow-duration curve analysis. As the results of future water quality prediction in Hongcheon river basin, we have known that BOD, COD and SS will be increased at the end of 21 century. Therefore, we need consider long-term water and water quality management planning and monitoring for the improvement of water quality in the future. For the prediction of more reliable future water quality, we may need consider various social factors with climate components.

• Journal of Korea Water Resources Association
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• v.41 no.2
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• pp.163-172
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• 2008

Hydrologic regimes play a major role in determining the biotic composition, structure, and function of river ecosystem. In this study, hydrologic regimes were analyzed on down stream effects of the Young-Chun dam construction using the Indicators of Hydrologic Alterations(IHA). The analysis results were as follows ; (1) Monthly mean flows were decreased during drought and flood season on the pre and post dam, (2) Magnitude and Duration of Annual Exterm Conditions, annual minima 1-day means was $3.48m^3/sec$, $0.89m^3/sec$ and annual maxima 1-day mean was $833.1m^3/sec$, $672.1m^3/sec$ on the pre and post dam (3) Timing of Annual Exterm conditions, Julian date of the annual minima 1-day means was 180th(June) in the pre dam, 257th(September) in the post dam, Julian date of the annual maxima 1-day means was 209th(July) in the pre dam, 217th(August) in the post dam, (4) Frequency and Duration of High and Low Pulse, Low Puls counts and duration were 3 times and 23 days in the pre dam, High Pulse counts and duration were 4 times and 2 days in the pre dam. (5) Rate and Frequency of Water Condition Changes, rise rates was 39.27 %, 19.36 % and fall rates -15.85 %, -8.16 % in the pre and post dam, respectively (6) Coefficient of Variation, annual exteram water conditions were decreased from 0.9054 to 0.6314 and from 1.0440 to 0.9617, Timing of Annual Exterm conditions were incereased for minima flow from 0.269 to 0.282, for maxima form 0.069 to 0.153.

• Journal of Environmental Policy
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• v.13 no.1
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• pp.69-93
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• 2014

The aim of this research was to develop a climate change vulnerability index at the district level (Si, Gun, Gu) with respect to the health care sector in Korea. The climate change vulnerability index was esimated based on the four major causes of climate-related illnesses : vector, flood, heat waves, and air pollution/allergies. The vulnerability assessment framework consists of six layers, all of which are based on the IPCC vulnerability concepts (exposure, sensitivity, and adaptive capacity) and the pathway of direct and indirect impacts of climate change modulators on health. We collected proxy variables based on the conceptual framework of climate change vulnerability. Data were standardized using the min-max normalization method. We applied the analytic hierarchy process (AHP) weight and aggregated the variables using the non-compensatory multi-criteria approach. To verify the index, sensitivity analysis was conducted by using another aggregation method (geometric transformation method, which was applied to the index of multiple deprivation in the UK) and weight, calculated by the Budget Allocation method. The results showed that it would be possible to identify the vulnerable areas by applying the developed climate change vulnerability assessment index. The climate change vulnerability index could then be used as a valuable tool in setting climate change adaptation policies in the health care sector.

• Journal of Korea Water Resources Association
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• v.55 no.2
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• pp.135-145
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• 2022

This study aims to verify the Drone utilization and the accuracy of the global navigation satellite system (GNSS), Drone RGB (Photogrammetry) (D-RGB), and Drone LiDAR (D-LiDAR) surveying performance in the downstream reaches of the local stream. The results of the measurement of Ground Control Point (GCP) and Check Point (CP) coordinates confirmed the excellence. This study was carried out by comparing GNSS, D-RGB, and D-LiDAR with the values which the hydraulic characteristics calculated using HEC-RAS model. The accuracy of three survey methods was compared in the area of the study which is the ownership station, to 6 GCP and 3 CP were installed. The comparison results showed that the D-LiDAR survey was excellent. The 100-year frequency design flood discharge was applied in the channel sections of the small stream. As a result of D-RGB surveying 2.30 m and D-LiDAR 1.80 m in the average bed elevation, and D-RGB surveying 4.73 m and D-LiDAR 4.25 m in the average flood condition. It is recommended that the performance of D-LiDAR surveying is efficient method and useful as the surveying technique of the geospatial information using the drone equipment in stream channel.

• Proceedings of the Korea Water Resources Association Conference
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• 2005.05b
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• pp.1128-1132
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• 2005

세굴을 일으키는 주요 원인은 와류의 작용에 의해서라고 알려져 있다. 와류를 일으키는 인자에는 흐름조건, 흐름의 변화, 하상재료, 그리고 교각의 형상 등이 있다. 그러나 세굴현상은 이들 인자 외에도 다른 원인들과 함께 복합적인 형태로 나타나기 때문에 수리 및 수치모형실험으로는 정확한 세굴을 규명하기 힘들다. 최근 국내에서는 보다 정확한 세굴을 관찰하기 위해 실시간 세굴모니터링이 이루어지고 있다. 이에 맞추어 실시간 세굴모니터링을 위해 초음파 세굴심 측정 센서가 개발되었는데, 이 센서는 수공구조물에 설치할 수 있어 평수 시뿐만 아니라 홍수 시에도 세굴의 변화를 관찰할 수 있다는 장점을 갖고 있다. 이 센서에 사용된 초음파는 반사면에 따라 반사파의 특성이 달라지는 성질을 갖고 있다. 본 연구에서는 이러한 초음파의 성질에 착안하여 초음파 세굴심센서를 이용한 하상재료 판단에 대한 실내실험을 실시하였다. 주로 하상에서 접할 수 있는 입자를 선정하여 실험을 실시하고 실험으로부터 획득된 초음파의 반사파자료를 이용하여 각 시료를 분류할 수 있는 정량적 근거를 제시하였다. 그리고 이 자료의 현장적용성을 검토하기 위하여 현장의 자료와 비교 및 분석하였다.

• Proceedings of the Korea Water Resources Association Conference
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• 2009.05a
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• pp.924-928
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• 2009

국내의 다목적댐 저수지는 물이 흐르는 하천에 용수공급, 홍수조절 및 수력발전을 위해 만든 구조물로 형성된 저류상태를 의미한다. 이러한 수체의 유동에 영향을 미치는 가장 중요한 요소로는 유입수와 저수지에서 하천으로 방류되는 방류수이므로 본 연구에서는 유입수와 방류수에 의한 수체의 유동만을 고려하였다. 대상지는 용담댐 유역중 취수탑이 있는 지점으로 길이는 약 1,250m이고 폭은 평균 375m 정도의 크기를 갖고 있는 지형이다. 대상 지역에서 저수지 수체의 흐름특성을 평가하기 위해 SMS-RMA2 모형을 적용하였으며 용담댐 저수지 구역에 대한 1m 간격의 등고선을 가지고 대상지역에 대하여 격자를 구성하였다. 격자 크기는 평균 길이 방향으로 43m, 폭 방향으로 15m 크기로 구성하였으며 유속이 상대적으로 빠른 취수탑 부근은 좀더 세밀하게 구성하였다. 4년간 수문자료를 분석하여 이 지역의 흐름을 년중 크게 3가지로 구분하였다. 수체거동이 급변하는 여름 강우기 후에 저수지에 물이 풍부한 경우의 흐름, 봄철 저수지 물이 풍부하지 않은 상태에서 주자천으로 부터의 유입은 최하인 상태의 경우 그리고 강우기에 짧은 기간 나타나는 주자천 위주 흐름의 경우로 구분하여 모의하였다. 각각의 경우 전체적인 흐름장은 확연히 다르게 나타났으며 이런 결과로 볼 때 수체의 흐름은 상하류의 유입량 변화에 따라 항상 흐름은 변화하는 것으로 평가되었으나, 저수지 수체의 흐름 속도는 모두 0.05$^{\sim}$1.5cm/sec 정도로 모의된 것은 수체적 대비 방류량이 적어서 나타나는 현상으로 평가되었다.

• International Journal of Highway Engineering
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• v.15 no.3
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• pp.75-83
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• 2013

PURPOSES: In this study, flood mitigation effect of drainage asphalt concrete pavement were analyzed by a SWMM 5.0 program in order to evaluate the low impact development (LID) based on the drainage asphalt concrete pavements. METHODS: In order to determine the porosity parameters of drainage asphalt concretes, the specimen mixtures were manufactured using the conditions presented in the previous study. The numerical simulation was conducted using the SWMM 5.0 program considering the flood mitigation effect of drainage asphalt concrete pavements. The effect of flood reduction can be observed when drainage asphalt concrete pavements were applied to Mokgamcheon watershed. The flood mitigation effect analysis of Mokgamcheon watershed as well as continuous simulation of subwatershed runoff were performed through this study. RESULTS : The analysis of drainage asphalt concrete pavements was carried out for evaluating the effect on runoff, resulting in: the peak flow decreases up to 1.26~9.53% after drainage asphalt concrete pavements applied in the SWMM 5.0 program furthermore, the discharge decreases up to 0.55~4.11%. CONCLUSIONS: As a result, the reduced peak flow and discharge were found through the SWMM 5.0 program. It can be concluded that the flood is effectively reduced when the drainage asphalt concrete pavements are used.

• Journal of The Korean Society of Agricultural Engineers
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• v.62 no.2
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• pp.1-15
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• 2020

In this study, the characteristics of crop damage area by flooding for 113 middle range watersheds during 2000-2016 were analyzed and future crop damage area by flooding were analyzed using 13 GCM outputs such as hourly maximum rainfall, 10-min maximum rainfall, number of days of 80 mm/day, daily rainfall maximum, annual rainfall amount associated with RCP 4.5 and RCP 8.5 scenarios and watershed characteristic data such as DEM, urbanization ratio, population density, asset density, road improvement ratio, river improvement ratio, drainage system improvement ratio, pumping capacity, detention basin capacity, and crop damage area by flooding. A constrained multiple linear regression model was used to construct the relationships between the crop damage area by flooding and other variables. Future flood index related to crop damage may mainly increase in the Mankyung watershed, Southwest part of Youngsan and Sumjin river basin and Southern part of Nackdong river basin. Results are useful to identify watersheds which need to establish strategies for responding to future flood damage.

• Proceedings of the Korea Water Resources Association Conference
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• 2011.05a
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• pp.215-215
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• 2011

우리나라 하천의 대부분은 산지에서 발원하며 전 국토의 약 67%가 산지하천 유역에 포함된다. 최근 기후변화로 인해 여름철 집중호우가 증가하고 있는 상황에서 강우의 예측이 어렵고 경사가 급한 산지하천 유역의 피해가 가중되고 있으며 돌발홍수나 산사태와 같은 산지재해 예방을 위한 대책 마련이 시급히 요구되고 있다. 산지하천유역에서 발생하는 재해를 예방하고 피해를 저감하기 위해서는 재해위험지역에 대한 선정 및 상시 모니터링 체계의 구축이 필요하며 본 연구에서는 격자기반의 산지하천 모니터링 시스템을 구축하여 강우상황과 예측정보, 이동상황을 모니터링 할 수 있는 시스템을 구축하였다. 산지하천 모니터링 시스템은 기상청 레이더 강우를 활용한 실시간 강우자료 및 강우예측자료(MAPLE) 표출, 분포형 수문모형과 연계한 유출분석 결과의 제공, AWS를 이용한 지점강우량 표출 등으로 구성된다. 또한, 지점자료 혹은 격자자료로 이원화되어 있는 기존 하천유역 모니터링 체계를 통합하여 사용자가 원하는 유역에 대한 기상자료의 모니터링과 위험지역에 설치된 지점관측정보를 연계 운영할 수 있도록 구현된 특징이 있다. 본 시스템은 현재 강원도 인제 내린천 유역을 대상으로 시험운영 중이며 격자기반의 강우모니터링과 토석류 현장모니터링 결과를 연계한 위험지 관리에 활용되고 있다.

• Journal of Korean Society for Geospatial Information Science
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• v.11 no.3 s.26
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• pp.35-40
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• 2003

In these days, damages from localized heavy rain or typhoon are increase and people are making constant effort to work out countermeasures. Especially, by apply GIS with prompt extraction of information and objective analysis, we could demonstrate more effectively. For that reason, in this research we make the connection between rainfall-runoff model and HEC-RAS which calculate automatically and inquire out the dangerous zone easier way by describing the result with the connection between the Map Object and MFC. Most of all, this research will be very useful to forecast and prepare the disaster because it could plot plane figures, longitudinal sections and cross sections at the same time to help understand the damaged situation.