• Proceedings of the Korea Water Resources Association Conference
• /
• 2011.05a
• /
• pp.299-303
• /
• 2011

사전재해영향성검토 협의제도는 개발로 인해 발생할 수 있는 재해유발 요인을 사전에 검토하여 이를 사전에 제거하는 것이 목적이다. 사전재해영향성 검토는 1996년부터 시행한 재해영향평가의 한계점을 보완하기 위하여, 2005년 개정된 자연재해대책법에서는 사전재해영향성 검토협의제도를 포함하였으며, 2005년 8월 17일 동법 시행령을 개정 공포하여 사전재해영향성검토 협의제도를 본격적으로 시행하게 되었다. 본고에서는 사업 대상 지구를 "부산장안지구 택지개발사업(1단계)"로 선정하였으며, 개발에 따른 재해 발생요인, 즉 유출량 증가에 따른 하류부의 홍수피해 가중, 토공 공사에 따른 토사유출량 증가, 절 성토계획 따라 유발되는 사면의 불안정에 대한 사전검토를 목적으로 하였다. 사업시행에 따른 개발중 토사유출량의 증가와, 개발후 홍수유출량의 증가로 재해의 위험이 예상되어 개발 중의 임시저류지 겸 침사지 2개소와 개발 후의 영구저류지 1개소를 계획하여 홍수유출량을 $2.48m^3/sec$을 줄이고, 토사유출을 90% 포착하였다.

• Journal of Korean Society of Coastal and Ocean Engineers
• /
• v.20 no.6
• /
• pp.540-552
• /
• 2008

We predicted to seasonal sediment transport pathway of the estuary area of the Nakdong river using the STA method. The eCSedtrend model was used to flexible application of the previous STA methods. The analysis of the seasonal interpretation of sediment transport pathway showed that the most dominant trend in the Nakdong estuary was CB+ and CB-. In case of CB+, it was identified around the area where the mud sediment was distributed and formed transport vector toward the north. Also, in case of CB-, it was identified mostly around the sand bar where the sand sediment was distributed and generally showed transport vector toward the north even though there was seasonal difference.

• Korean Journal of Ecology and Environment
• /
• v.36 no.2 s.103
• /
• pp.200-207
• /
• 2003

This research was conducted to investigate the influences caused by solifluction soil on the physicochemistry of stream water quality in the riparian area: four points of the northeastern side slopes part of the Bughansan National Park from March to May of 2002. The average pH of stream water was relatively high with the influenced of solifluction soil. The average electrical conductivity of upstream water was 2.1${\sim}$2.8 times lower than that in downstream water. pH and amount of anion ($Cl^-,\;N0_3\;^-, So_4\;^{2-}$) of stream water was correlated under the effect of solifluction soil.

• Journal of The Geomorphological Association of Korea
• /
• v.20 no.1
• /
• pp.75-83
• /
• 2013

Human-induced modifications in coastal area may cause strong geomorphic responses by disturbing sediment supply, transport and deposition regimes. Morever, engineering structure have been built to stabilize coastal change, these effort impact on other morphologic change. In case of coastal area, there are lack of sediment yield data. This study focus on the tendency of long-term shoreline change, estimate method od sediment discharge which is a major factor of coastal change and adduced to way for considering design load influenced to coastal road.

• The Journal of Korean Institute of Next Generation Computing
• /
• v.15 no.4
• /
• pp.51-61
• /
• 2019

In this paper, we have implemented soil simulation using fluid simulation technology. A widely used NVIDIA FleX was used to represent the soil generated by excavation work. FleX is a particle-based physics simulation library that combines SPH (Smoothed-particle hydrodynamics) and Position Based Dynamics techniques. However, since the soil has not only fluid properties but also non-fluid properties, it is difficult to simulate with the functions provided by conventional FleX. In this study, we added a technique to simulate non-fluid behavior using existing Flex. This can lead to effective results improvement at low cost.

• Proceedings of the Korea Water Resources Association Conference
• /
• 2023.05a
• /
• pp.138-138
• /
• 2023

본 연구에서는 유목과 연행침식을 고려한 토석류 수치모형을 개발하여 2011년 발생한 우면산 산사태의 관측데이터를 기반으로 수치모의를 수행하였다. 토석류 모형개발을 위해 천수방정식 기반의 침수모형인 Nays2DFlood 모형에 혼합유사농도의 이송확산, 토석류 지면전단응력, 연행침식모듈을 추가하였으며 유목생성과 유목거동 모의를 위해 입자법 기반의 유목동력학 모형을 결합하였다. 개발된 모형을 검증하기 위해, 민감도분석을 수행하였으며, 모의결과, 우면산 산사태 당시 래미안 APT에 피해를 끼친 충격수심과 충격유속, 최종 토석류 체적을 양호하게 재현한 것으로 판단된다. 또한 토석류를 구성하는 토사입경이 작을수록 토사점성에 의한 전단응력의 증가로 토석류 유속과 수심이 감소했지만 연행침식량이 증가하였으며, 토사입경이 증가하면 유속과 수심이 증가하고 연행침식량은 감소한 것으로 나타났다. 또한 본 연구에서 개발된 토석류 거동모형은 토사입경, 침식 및 퇴적계수 등의 다양한 토석류 매개변수가 요구되기 때문에, 이러한 물성치 데이터가 현장 또는 실내실험에서 충분히 확보되어야 모형의 정확도가 향상될 것으로 판단된다. 따라서, 향후 연구에서는 본 연구에서 고찰된 모형의 적용성과 한계점을 고려하여 토석류 거동을 예측모의 한다면 보다 세부적으로 토석류와 유목거동을 예측분석해 볼 수 있을 것으로 사료된다. 또한 본 연구의 결과는 기후변화로 인한 강우발생의 불확실성과 이로 야기되는 토석류 발생을 사전에 예측하여 토석류 저감대응방안을 구축하는 일환으로 활용 될 수 있을 것으로 기대된다.

• Proceedings of the Korea Water Resources Association Conference
• /
• 2006.05a
• /
• pp.333-337
• /
• 2006

The purpose of this paper is to present a strategic approach to selecting prior areas of soil erosion to be examined for effective soil conservation planning and management, in conjunction with remote sensing data and GIS skill for surface characteristics. To do this, two basins are selected: Andong and Imha basin. Geographically one is in the vicinity of the other but turbidity in the main reservoir of each basin is quite different. it is important to clarify general behavior of soil erosion driven by rainfall event for both basins for further understanding and effective soil conservation planning and management. Also, Both basins are divided into several sub-basins and the severity of soil loss is intensively investigated to identify areas with high erosion potential for each sub-basin so that the efficiency of soil conservation program may increase. Especially, this study analyzed soil erodibility factor(K), topographic factor(LS), cover management factor(C) and soil erosion; 3 sub-basins for Andong basin (up-, mid-, downstream) and 6 sub-basins for Imha basin (up-, mid-, and downstream for two tributaries) because Imha basin consists of two tributaries (Banyeon and Yongjeon river). The approach suggested herein will provide a guideline for choosing prior areas to be examined and managed for soil conservation planning.

• Journal of Korea Water Resources Association
• /
• v.51 no.2
• /
• pp.175-182
• /
• 2018

Coastal sediment archives are used as indicators of changes on shore sediment production and fluvial sediment transport, but rivers crossing coastal plains may not be efficient conveyors of sediment to the coast. In some case there is a net loss of sediment in lower coastal plain reaches, so that sediment input from an upstream exceeds the sediment yield (SY) at the river mouth. The main source of sediment in coastal area is the load from land. In Korea, data on suspended SY are limited owing to a lack of logistic support for systematic sediment sampling activities. This paper presents an integrated approach to estimate SY for ungauged coastal basins, using a soil erosion model and a sediment delivery ratio (SDR) model. For applying the SDR model, a basin specific parameter was validated on the basis of field data. The proposed relationships may be considered useful for predicting suspended SY in ungauged basins that have geologic, climatic and hydrologic conditions similar to the study area.

• Journal of the Korean Society of Hazard Mitigation
• /
• v.10 no.5
• /
• pp.135-141
• /
• 2010

Reliability model which can calculate the probability of performance failure of storm sewer was developed considering change of roughness coefficient in this study. Roughness coefficient should be re-evaluated due to accumulations of debris in sewer pipe. Therefore, roughness coefficient according to depth of debris in circular sewer pipe was determined for the present study. Reliability analysis was performed with the new roughness coefficient. After the analysis, it was found that capacity of storm sewer can be significantly decreased and probability of performance failure of storm sewer can be significantly increased by increasing the depth of debris in storm sewer. In this study, reliability model was applied for the Daegu and Jeonju using new roughness coefficient which was determined according to accumulation of debris in circular storm sewer. It was observed that if the depth of debris is increased, roughness coefficient is increased simultaneously and probability of performance failure of storm sewer is significantly increased.

• Korean Journal of Food Science and Technology
• /
• v.50 no.5
• /
• pp.474-479
• /
• 2018

In this study, ultrasound-assisted extraction conditions of total anthocyanins and total phenolic compounds from Campbell early grape (Vitis labruscana) were optimized via response surface methodology using a Box-Behnken design. Three independent variables, including solid-liquid ratio (1/30-1/50 g/mL), extraction time (2-10 min), and amplitude (20-100%), significantly affected total anthocyanin content. However, no significant effect of these variables was observed in the total phenolic compound content. The optimized extraction conditions were solid-liquid ratio of 1/48.13 g/mL, extraction time of 2 min, and amplitude of 20%. Under these conditions, the predicted values of total anthocyanins and total phenolic compounds were 94.96 and 1,661.16 mg/100 g dry weight (DW), respectively. The experimental values of total anthocyanins and total phenolic compounds were 88.25 and 1,554.37 mg/100 g DW, respectively, which is well matched with the predicted values within 7.5% difference.