• 한국항공운항학회지
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• 제17권1호
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• pp.17-23
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• 2009

The purpose of this study is possibility of the heavy rainfall prediction using instability index. The convective instability index using this study is Convective Available Potential Energy(CAPE) concerned the growth energy of the storm, Bulk Richardson Number(BRN) concerned the type and strength of the storm, and Sotrm Relative Helicity(SRH) concerned maintenance of the storm. To verify the instability index, the simulation of heavy rainfall case experiment by Numerical Weather Prediction(NWP) model(MM5) are designed. The results of this study summarized that the heavy rainfall related to the high instability index and the proper combination of one more instability index made the higher heavy rainfall prediction.

• 한국습지학회지
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• 제8권2호
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• pp.75-81
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• 2006

본 연구에서는 도시 소유역에 위치한 배수펌프장의 집중호우 시 운영 개선방안을 도출하기 위한 기초연구로서 강우유출을 모의하고자 하였다. 이를 위해 GIS근간의 강우유출 모의 모델인 HEC-HMS를 활용하였으며, 2001년 7월 구리시에 발생한 집중호우에 대한 홍수유출수문곡선을 모의 할 수 있었다. 이때 강우유출모의에 필요한 유역의 토지이용현황, 토양형 및 유출곡선지수 등의 모델 입력자료는 ArcView GIS 툴과 수치지도 자료를 활용하여 산정할 수 있었다.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2003년도 Proceedings of ACRS 2003 ISRS
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• pp.804-806
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• 2003

Probable Maximum Precipitation (PMP) is essential in the design of hydraulic structures such as dams, weirs and flood control structures. Up to the present, PMP has been derived from any proper single storm which can have a large error. PMP values should be evaluated from many historic heavy storm events from all over the country. Since this can be done at the spots of storm occurring and the calculated PMP from all spots in the country can be correlated. The objectives of this study are therefore to evaluate PMP from historic heavy storm data from 1972 to 2000 by using meteorological method, then to correlate and to present the results using GIS. The maximized rainfall depths can be calculate from depth of heavy rainfall and dew point temperature, and then can be analyzed for each rainfall duration to obtain spatial rainfall distribution by using GIS. The depth-area-duration relationship of maximized rainfall can be obtained and this helps to develop enveloped curves . The results from this study are a set of contour maps of PMP for each rainfall duration for all over the country and the depth-area-duration relationships for the area of 100 to 50,000 km.$^{2}$ at duration of 1, 2 and 3 days.

• Spatial Information Research
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• 제15권2호
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• pp.159-167
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• 2007

본 연구에서는 현재 홍수설계에 적용되고 있는 Huff 방법이 집중호우사상에까지 확장 적용될 가능성이 있는지를 확인하고자 하였다. 이를 위해 2006년 7월 집중강우가 발생한 평창 오대천 유역을 중심으로 집중강우에 의한 실측 강우량과 이를 Huff방법에 의해 설계 강우량으로 환산하고 유출량을 산출하고 또한 홍수위로 환산하여 흔적수위와 비교하였다. 비교 결과 설계강우에 의해 산출된 홍수량은 실제 발생했던 실제 집중강우를 적용하였을 경우의 첨두홍수량에 비해 1/2정도에 불과한 작은 값을 보였다. 또한 실제 집중호우에 의해 발생한 홍수량은 단시간에 발생한 강우사상임에도 불구하고 적용대상유역의 150년 빈도 홍수량에 근접하는 것으로 나타났다.

• 대기
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• 제18권4호
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• pp.317-338
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• 2008

Analyses of observational data and numerical simulations were performed to understand the mechanism of MCSs (Mesoscale Convective Systems) occurred on 13-14 July 2004 over Jindo area of the Korean Peninsula. Observations indicated that synoptic environment was favorable for the occurrence of heavy rainfall. This heavy rainfall appeared to have been enhanced by convergence around the Changma front and synoptic scale lifting. From the analyses of storm environment using Haenam upper-air observation data, it was confirmed that strong convective instability was present around the Jindo area. Instability indices such as K-index, SSI-index showed favorable condition for strong convection. In addition, warm advection in the lower troposphere and cold advection in the middle troposphere were detected from wind profiler data. The size of storm, that produced heavy rainfall over Jindo area, was smaller than $50{\times}50km^2$ according to radar observation. The storm developed more than 10 km in height, but high reflectivity (rain rate 30 mm/hr) was limited under 6 km. It can be judged that convection cells, which form cloud clusters, occurred on the inflow area of the Changma front. In numerical simulation, high CAPE (Convective Available Potential Energy) was found in the southwest of the Korean Peninsula. However, heavy rainfall was restricted to the Jindo area with high CIN (Convective INhibition) and high CAPE. From the observations of vertical drop size distribution from MRR (Micro Rain Radar) and the analyses of numerically simulated hydrometeors such as graupel etc., it can be inferred that melted graupels enhanced collision and coalescence process of heavy precipitation systems.

• 한국수자원학회논문집
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• 제33권5호
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• pp.569-580
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• 2000

지구온난화와 같은 기후변화로 인해 최근에 한반도에서 급증하고 있는 집중호우의 영향을 알아보기 위해서 12개 우량관측소 지점의 연 최대 강우량 계열에 대한 빈도해석을 실시하였다. 확률강우량의 시간적인 변화를 알아보기 위해 자료기간을 30년으로 한 후 1년씩 이동하면서 l00년 빈도 확률강우량을 산정하였고, 80% 이상의 지점에서 최근의 집중호우가 과거에 비해 상대적으로 증가하고 있음을 확인하였다. 또한 자료기간을 1년씩 누가하면서 100년 일최대 확률강우량을 산정하여 집중호우가 발생했던 해의 연 최대 강우량 포함에 따른 확률강우량의 증가 경향을 파악하였다. 이를 통해 수공고조물의 설계를 위한 빈도해석시 자료기간 산정의 중요성과 기존 하천시스템의 홍수방어능력에 대한 재평가 필요성을 확인할 수 있었다.

• 한국수자원학회논문집
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• 제30권4호
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• pp.389-399
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• 1997

1996년 7월 26일∼28일에 걸쳐 경기북부 및 강원영서 지방에 내린 기록적인 집중호우를 대사으로 연천댐 붕괴의 원인이 된 한탄강유역 호우의 수문기상학적 규모와 발생특성을 분석하였다. 한탄강유역 및 인군에 위치한 21개 우량관측소의 시간 우량자료를 수집하여 지점별, 지속시간별 누가우량곡선을 작성·비교함으로써 호우의 공간적 이동특성을 분석하였다. 또한, 연천댐유역에 내린 지속시간별 유역 평균 연속강우량을 철원 및 연천우량관측소의 빈도우량과 비교하였을 뿐 아니라, 이 지역의 지속시간별 가능최대수량(PMP)과도 비교함으로써 '96년 7월 호우가 이 지역에서는 기왕 최대기록 호우임을 입증하였다.

• 대한지리학회지
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• 제33권3호
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• pp.395-409
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• 1998

미국남부지방의 5개 도시를 연구지역으로 도시의 영향에 의한 강수특성변화를 파악하고 종관기상유형에 따른 특성을 규명하기 위하여 2 인치(50.08 mm) 이상의 일강수량을 가지는 강수일을 선택하여 3가지 강수유형(기단성 강수, 전선성 강수, 열대저기업성 강수)으로 구분하여 분석하였다. Houston, Dallas, 그리고 San Antonio에서는 기단성 강수가 발생할 때, 도시직역과 풍하측에 호우로 인한 강수량과 강수빈도의 증가가 나타나고 있으나 New Orleans와 Memphis에서는 종관적 분석을 통해서 볼 때 현저한 증가현상을 보이지 않는다. 경향면 분석겨로가는 전선성 강수와 열대저기업성강수 발생시 기단성 강수로 인한 호우보다 강한 경향성을 가지는 것을 보여주고, 호우로 인한 통강수량은 강수일수빈도보다 강한 경향성을 가진다. 잔차도 분석결과는 기단성 호우 발생시 도시지역과 풍하지역에 양의 잔차가 나타나는 것을 보여준다. 미국 남부의 5개도시에서 강수특성변화에 미치는 도시화의 영향에 대한 연구는 도시기후는 종관적으로 유사한 조건하일지라도 도시의 규모, 공간구조, 수체의 유무, 산업구조 등 다양한 특성에 따라 상이하게 반응함을 알 수 있었다.

• 한국농공학회지
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• 제26권2호
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• pp.69-84
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• 1984

This study was carried out to investigate the time distribution of single storms and to establish the model of storm patterns in korea. Rainfall recording charts collected from 42 metheorological stations covering the Korean peninsula were analyzed. A single storm was defined as a rain period seperated from preceding and succeeding rainfall by 6 hours and more. Among the defined single storms, 1199 storms exceeding total rainfall of 80 mm were qualified for the study. Storm patterns were cklassified by quartile classification method and the relationship between cummulative percent of rainfalls and cummulative storm time was established for each quartile storm group. Time distribution models for each stations were prepared through the various analytical and inferential procedures. Obtained results are summarized as follows: 1. The percentile frequency of quartile storms for the first to the fourth quartile were 22.0%, 26.5%, 28.9% and 22.6%, respectively. The large variation of percentile frequency was show between the same quartile storms. The advanced type storm pattern was predominant in the west coastal type storm patterns predominantly when compared to the single storms with small total rainfalls. 3. The single storms with long storm durations tended to show delayed type storm patterns predominantly when compared to the single storms with short storm durations. 4. The percentile time distribution of quartile storms for 42 rin gaging stations was estimated. Large variations were observed between the percentiles of time distributions of different stations. 5. No significant differences were generally found between the time distribution of rainfalls with greater total rainfall and with less total rainfall. This fact suggests that the size of the total rainfall of single storms was not the main factor affecting the time distribution of heavy storms. 6. Also, no significant difference were found between the time distribution of rainfalls with long duration and with short duration. The fact indicates that the storm duration was no the main factor affecting the time distribution of heavy storms. 7. In Korea, among all single storms, 39.0% show 80 to 100mm of total rainfall which stands for the mode of the frequency distribution of total rainfalls. The median value of rainfalls for all single storms from the 42 stations was 108mm. The shape of the frequency distribution of total rainfalls showed right skewed features. No significant differences were shown in the shape of distribution histograms for total rainfall of quartile storms. The mode of rainfalls for the advanced type quartile storms was 80~100mm and their frequencies were 39~43% for respective quartiles. For the delayed type quartile storms, the mode was 80~100mm and their frequencies were 36!38%. 8. In Korea, 29% of all single storms show 720 to 1080 minutes of storm durations which was the highest frequency in the frequency distribution of storm durations. The median of the storm duration for all single storms form 42 stations was 1026 minutes. The shape of the frequency distribution was right skewed feature. For the advanced type storms, the higher frequency of occurrence was shown by the single storms with short durations, whereas for the delayed type quartile storms, the higher frequency was shown gy the long duration single storms. 9. The total rainfall of single storms was positively correlated to storm durations in all the stations throughout the nation. This fact was also true for most of the quartile storms. 10. The third order polynomial regression models were established for estimating the time distribution of quartile storms at different stations. The model test by relative error method resulted good agreements between estimated and observed values with the relative error of less than 0.10 in average.

• 생태와환경
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• 제38권spc호
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• pp.39-43
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• 2005

The dynamics of water quality with the storm events were analyzed in a small reservoir for irrigation, Lake Wangkung. Water quality of the inflowing stream fluctuated seasonally with the variation of flow rate. Thermal stratification was consistent from April to October below 2 m depths and anoxic layer was developed below 2 m depth in summer. The unique feature of temperature showed that thermal stratification was disrupted by a heavy rain event during monsoon, but hypolimnetic hypoxia were reestablished after a few days. Phosphorus and nitrogen increased immediately following storm events. The marked increase may be due to the input of P-rich storm runoff from the watershed. Internal phosphorus loading can be one of the explanations for TP increases in summer. When there was a storm, total populations of phytoplankton and zooplankton was reduced immediately following the storm, indicating possible flushing of algae and zooplankton. After a lag period of low-density the plankton population bloomed to a peak again within five days after the storm. Turbid water in lake became clear again which coincided with the time of the phytoplankton buildup. The results demonstrate that water quality is regulated greatly by rainfall intensity in Lake Wangkung.