• The Korean Journal of Ecology
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• v.27 no.4
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• pp.211-216
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• 2004

The complex ecological researches were made in the broad-leaved forest zone of Central Europe in nature reserves and national parks located on the banks of the river (hydrology, vegetation, soils, unconfined ground waters). The natural conditions of terrestrial ecosystems and natural sites were compared along the course of the rivers. The significant negative influence of low-dammed (low-confined hydrotechnic) construction and small reservoirs on vegetation and soils of floodplain was revealed. On the basis of analysis of mean annual water level and flow trends on the multi-years series (60-100 years) of the hydrometric stations on the rivers under consideration the significant influence of natural long-term variability of watering on vegetation dynamics in the floodplains was revealed.

• Proceedings of the Korea Water Resources Association Conference
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• 2005.05b
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• pp.1264-1268
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• 2005

본 연구에서는 2002년부터 2004년까지 3년에 걸쳐 한강고수부지(반포지구)에서 수목 식재에 따른 수리적 영향을 수치모형 및 현장조사를 통하여 평가하였다. RMA-2모형을 이용하여 분석한 결과 수목 식재전$\cdot$후로 수위는 3 cm 증가하고 유속은 4 cm/s 감소하는 것으로 나타났다. 따라서 식재로 인한 수리량의 변화는 매우 미미한 것으로 나타났다. .현장조사를 통해 얻은 실측자료도 홍수 시 수목 식재에 의한 하천수리특성에 미치는 영향은 크지 않은 것으로 나타났다. 그러나 매년 홍수기간 동안 보여 지는 침수양상에 따라 수리특성이 상이하게 나타났다. 그러므로 지속적인 자료 수집을 통하여 다양한 침수상황에 다른 기초 수리자료를 축척하고 정밀 분석할 필요가 있다. 또한 수리모형실험을 통해 현장조사 및 수치모형 결과와 비교$\cdot$분석하여 상호보완 할 필요성이 있다.

• Proceedings of the Korea Water Resources Association Conference
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• 2005.05b
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• pp.168-172
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• 2005

내수침수로 인한 수해가 빈번하게 발생하고 있는 삽교천 유역 중하류부를 대상으로 하구에 위치한 삽교호와 유역에서 유일하게 홍수조절 기능을 갖춘 예당지가 이 지역의 침수특성에 미치는 영향을 분석하였다. 아울러 신속한 홍수배제와 홍수유출량 저감을 목적으로 삽교호 배수갑문을 증설하고, 예당지를 증고하여 홍수조절 용량을 확장하였을 경우의 효과를 침수면적, 침수시간, 연평균피해경감기대액 등 다양한 기준에 의해 검토하였다. 그 결과 내수침수 저감을 목표로 할 경우 외수범람방어 위주의 기존 치수계획과는 차별되어야 하는 요소를 확인할 수 있었고, 사업대상지역 및 치수계획의 목표에 적합한 대안을 선정하는데 필요한 각 홍수방어대안의 특성을 파악할 수 있었다.

• Proceedings of the Korea Contents Association Conference
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• 2011.05a
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• pp.315-316
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• 2011

하천에 침입한 식생은 흐름 저항을 증가시키며, 이로 인해 유속이 감소하고 홍수위가 증가하며 하천 지형 변화에도 상당한 영향을 미치게 된다. 이 연구는 한강하류부에 위치한 장항습지 식생이 홍수위에 미치는 영향을 분석하기 위한 연구이다. 홍수 흐름 예측에는 이차원 흐름모형을 사용하였으며, 식생의 영향은 조도계수를 변화시키는 방법을 사용하였다. 장항습지의 수목 밀생지역에서 유속이 약 60% 이상 감소되는 것으로 나타났으며, 저수로에서 유속은 약 20~30% 증가되는 것으로 나타났다. 좌안으로 접근할수록 유속의 증가가 두드러지는 것으로 예측되었다. 식생을 고려했을 때, 유속이 좌안으로 치우치고 장항습지의 경계 부근에서 줄어드는 현상은 장항습지의 성장과도 관련이 있는 것으로 판단된다.

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 1996.06c
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• pp.257-262
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• 1996

Large amount of water is diverted annually for irrigation along the Yellow River. Owing to the tremendous sediment carried by the river , sediment deposits is an important problem in irrigation and drainage system. The sediment has to be taken out by machines from the irrigation system, otherwise water can not be available in the right place at the right time. In order to improve the sediment desilting efficiency, the sediments that settle in certain sites of a irrigation system must be removed by different desilting machines with special performance and working conditions. Those certain sites include : the diversion canal in the flood plain , the mouth of inlet, settling basin , irrigation and drainage system. In view of removal sediment above, the paper presents the ideas of type selection of desilting machines applied to certain sites. Proposals of making further improvement on performance for some desilting machines are also put forward.

• Journal of the Korean earth science society
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• v.21 no.2
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• pp.174-187
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• 2000

The Quaternary coarse-grained sandy sediments are distributed along the channels of Seomjin River. The fluvial sediments were sedimentologically studied in horizontal and vertical distributions. To analyze depositional environments and facies changes in the sediments, sediment sampling from river mouth to upper stream and desctriptive approaches to the sediment profiles outcropped near Kurye were carried out. The sediments along the stream lines of the river are assigned to very coarse to coarse sand in grain size. The sediment grains are widely scattered in sorting and moderately sorted in average. For skewness and kurtosis, the sediments ranges from very fine to very coarse skewed and from very lepto-kurtic to extremelyl epto-kurtic states, respectively. The sediments are divided into slightly gravelly sand, gravelly sand and sandy gravel in sediment type. The pain shape in the sandy sediments are dominant in equant and tabular forms showing wide varieties. The sandy sediments are mostly poorly sorted and are highly variable in surface texture with SEM. Some smaller grains in the sediments ordinarily show polished surfaces. Of those grains, quartz ones are commonly angular to surounded. On the basis of facies changes and sedimentary structures, outcropped fluvial sediment profiles in Kurye are classified into xGyS, mGyS, gGyS, xSM, xS, mS, mGyM, IgM in facies. These eight facies are reformed as facies assemblage I and ll. The facies assemblage I and II are interpreted as the products of the channel deposits in braided stream and flood plain ones besides channels, respectively. The change facies assemblage I with facies assemblage ll imply that depositional environments hadbeen migrated from braied sream to flood plain ones.

• Korean Journal of Environment and Ecology
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• v.22 no.5
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• pp.564-594
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• 2008

For this study, which was conducted in summer from $2006{\sim}2007$, 25 places of stream area in Korea, which were not affected by human, were selected by considering variable environmental factors. Plant surveys were performed in five qaudrats per each place of stream area(stream length=about 1km) on the basis of Braun-Blanquet(1964) and in four belt(length=20m) per each place of stream area by using belt-transect method in order to study the vegetation of the present-day potential natural state of water. In the results of the plant survey, the common plant communities in the mid-northern district(latitude$37^{\circ}37.9^{\circ}N$) were Quercus mongolica community and Fraxinus rhynchophylla community(with Quercus mongolica and Quercus aliena), and the common plant communities in the southern district(latitude$35^{\circ}35.9^{\circ}N$) were Quercus serrata community, Styrax japonica community and Quercus variabilis community. The common plant communities in the central district(latitude$36^{\circ}36.9^{\circ}N$) were Quercus serrata community, Fraxinus rhynchophylla community and Quercus aliena community, which have the middle characteristic between mid-northern and southern district. Also, in the results of correlation analysis between environmental factors and appearance of plant species in the survey places of stream area, Eco region showed the most significant correlation, but for the plan to restore flood plain, it is necessary to clarify the vegetation of potential natural stream by increasing the number of study cases considering variable environmental factors, in the future.

• Proceedings of the Korea Water Resources Association Conference
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• 2006.05a
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• pp.45-50
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• 2006

About 50% of the population and 75% of the properties concentrate on the flood plain in Japan. The rivers have intimate relationship with our lives. Those conditions have been seen after modern river improvement projects that began about a century ago. The technology which was introduced from foreign countries was improved in conformity with geographical features and the climate condition of our nation, and has redeveloped as a Japanese original technology. In 1940's, Japan had serious natural disasters that were caused by large- scale typhoons. Those typhoons wiped out everything completely. Even though the government realized the importance of flood control and management after those natural disasters, civil work still aimed to economic development. Those construction works have become the one of factors for concentrating population and degrading natural environment in urban areas. Deterioration of river environment has become serious issue in urban development and main cause of pollution. The approaches for environmental restorations which were started about 30 years ago aimed to harmonize with nature environment and cities and human lives. There have been going on many projects called 'river environmental improvement projects', the 'nature friendly river works' and 'natural restoration projects.' The society has tried to find a way to live in harmony with nature. As for societies symbiotic with habitats will form the safe country in the history and the spectacle. Such as the symbiotic of the river or the basin where discharge, water quality, nature, the history, landscape, the local society and also for culture were built in is achieved. Examples of working, applied to restoration technologies and the one to describe the mechanism construction are been shown in the paper. Furthermore, write for an international spread of the river technology of Japan to attempt.

• Journal of the Korean association of regional geographers
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• v.9 no.4
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• pp.413-424
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• 2003

This study aims to interpret the location of 4 traditional settlements in the Youngnam district of Korea in view of geomorphology. For this study, GIS techniques were used to analyse quantitatively the degree of slope, slope aspect and the relation with river/stream of these regions. Yugok is located on pediment in the valley basin. Cheonjeon is located in the end part of the hill. Hahoe is located on the convex natural levee of the flood plain. Yangdong is located on a hillside. Houses are mostly distributed with south, southeast, and southwest aspect, but in Hahoe face all sides. Also, the settlements are located on average $10{\sim}20m$ above river bed. This indicates a safe height above river bed for avoiding an flood damage. These results imply that the location of the traditional settlement is based on a scientific logic and rationale. It is thus argued that the settlements satisfy exellent geomorphic conditions from the perspective of modern theories of residential location.

• Journal of the Korean association of regional geographers
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• v.10 no.2
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• pp.300-312
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• 2004

The geomorphological environment of Suwon Basin consists of two great elements: mountains which surround the basin and plains and low relief hills by differential erosion of granitic area. Nothern and eastern parts of the basin surround with gneissic mountains(Mt. Kwangkyo), southern and western parts of the basin with granitic mountains(Mt. Chilbo, etc). The basin developed on granitic saprolites is composed of two types of sub-order geomorphic elements: flood plains alongside four river(Whangkuji-chon, Seoho-chon, Suwon-chon, Wonchonri-chon) and aligned hills and mounts between the river side plains. While the low down lands provided the spatial condition for the extention of downtown of Suwon, the gneissic mountains have played the positive roles by high ecological dam effects with stable supply of water and purification of air, etc.