• Korean Journal of Fisheries and Aquatic Sciences
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• v.24 no.5
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• pp.289-302
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• 1991

Laboratory determination of acoustic property for unconsolidated sediment of Kwangyang Bay was carried out. The compressional wave velocity was correlated to other physical properties and sediment textures to establish a geoacoustic model of the bay. The model was compared to the North Pacific continental terrace sediment. Velocity of the bay is systematically lower(0.02-0.04km/s) than that of the North Pacific. Average velocity of the bay is 1.521km/s. The lowest velocity is measured at the southwestern part of the bay. This area coincides with high amount of fine-grained sediment related to slower circulation. The overall tendency is, however, similar to the North Pacific continental terrace sediment.

• Journal of the Korean Geographical Society
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• v.44 no.3
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• pp.224-239
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• 2009

This study analyzes the properties of fluvial landforms in the upper and lower reaches and investigates the evolutions of stream and fluvial terrace in the Odae river basin. The lower basin of the river that consist of sedimentary rocks resistant to weathering and erosion processes shows higher altitude, relief and slope than the upper basin that consist of granite less resistant to weathering and erosion processes. The average width of river valley at the lower reaches is one-third to the upper reaches and the average width of river channel at the lower reaches is narrower than at the upper reaches. Based on the OSL age dating, the fluvial terrace T1 formed at the temperature-rising period during the late MIS 2 and T2 formed at the middle MIS 3, interstadial period during the last glacial period. Based on the these results, the average incision rates of Odae river are calculated as 0.205m/ka and 0.269m/ka at the upper granite area and lower sedimentary rocks area, respectively.

• The Korean Journal of Quaternary Research
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• v.23 no.1
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• pp.1-24
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• 2009

Paleosol layers lying on top of the terrace in Jeongdongjin area appear to have been deposited under generally well-drained condition with periodic waterlogging. From a 4.5m-long profile observed, a total of 6 stratigraphic units were identified. Grain-size analysis indicates the dominance of silty and clay materials with some portions with high sand content. Major mineralogical elements are quartz, feldspar, mica and chlorite. Geo-chemical composition shows little change throughout the stratigraphy with some fluctuation in chemical weathering index. Marked increase in magnetic susceptibility is recognizable where stratigraphic unit changes. Soil- wedge layer is developed around 50cm below the surface with concentration of grains of AT tephra (c. 25,000 BP). An OSL date of c. 110,000 BP was obtained from a sand layer lying below the paleosol.

• Journal of the Korean association of regional geographers
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• v.22 no.4
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• pp.875-886
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• 2016

The eastern coast of Seopo-myeon, Sancheon-si in the South Coast is a bay almost completely separated from open sea by Changseon and Namhae Islands. Marine terraces in this area can be classified into geomorphic surfaces with elevations of 10~12m, 15~18m, 20~24m, 25~28m, 30~33m, 35~38m, 40~45m, 45~50m and 54m. This marine terrace system is similar to the Boryeong area in the West Coast. The geomorphic surfaces distribute along ridges and show relatively small areas. The young and old surfaces show a mixed distributional pattern. This distributional pattern contrasts to the East Coast where the oldest surface farthest from the coastline is parallel to the coast and age of the surfaces increases with a distance from the coast. These seem to result in high energy waves by typhoon that developed wave-cut platform on hill areas with relatively complex relief in a short time.

• Proceedings of the Korea Water Resources Association Conference
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• 2012.05a
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• pp.781-781
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• 2012

본 연구에서는 수문-수질 모의가 가능한 SWAT (Soil and Water Assessment Tool) 모형을 이용하여 경안천 상류의 별미천 유역($1.21km^2$)을 대상으로 최적관리기법(Best Management Practice, BMP) 적용에 따른 비점오염원 저감효과를 분석하고자 한다. 이를 위해, 별미천 유역내 논($0.049km^2$)과 밭($0.018km^2$) 지역에 대한 BMP 시나리오를 작성하였다. 먼저, 논에서는 계단식(Terrace) 재배 방법을 적용하였으며, 밭에서는 등고선(Contour farming) 재배 방법과 볏짚지표피복 시나리오를 적용하였다. 여기서, 볏짚지표피복 시나리오는 현재 $1276.6m^2$, 경사도 약 3.2%의 콩 재배가 이루어지고 있는 시험포장에서 수행된 결과를 이용하여 SWAT 모형의 지표유출관련 매개 변수를 조정하였다. SWAT 모형의 적용성 평가를 위해, 1:5,000 수치지도로부터 2m DEM(Digital Elevation Model) 및 QuickBird(2006.05.01) 위성영상으로부터 스크린 디지타이징기법(On-Screen Digitizing Method)을 이용하여 총 21개 토지이용항목의 1:5,000급 정밀토지이용도를 작성하고, 농촌진흥청에서 제공하는 1:25,000 정밀토양도를 구축하였다. 또한, 유역출구점에서 자동수위 및 강우량 계측기, 수질측정을 위한 오토샘플러를 설치하여 시간당 수위(유량), 강우 자료와 강우발생에 따른 수질자료(Sediment, Total Nitrogen, Total Phosphorus)를 이용하여 모형의 검보정(2011.06.08 ~ 2011.10.31)을 실시하였다. 모형의 검보정 후, 논에서의 Terrace 및 밭에서의 Contour farming, 밭 시험포장에서의 저감효과가 분석된 지표피복시나리오의 적용을 위한 SWAT 모형의 관련 매개변수를 정의하고, 각 BMP 시나리오별 비점오염원 저감효과를 분석하였다.

• Journal of The Geomorphological Association of Korea
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• v.15 no.2
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• pp.1-9
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• 2008

This studied area is divided into the mountains and the valleys. The former is nearly consisted of the badland, the latter is consisted of alluvial plains in the valley, fluvial terrace at the side of the river, alluvial fans between mountains and river terrace. There are many tors, mushroom rocks, sugarloaves, weathering pits, castle coppies, columnar rocks, pinnacles, balanced rocks carved on tuff by means of erosion in the Chiricahua Nat'l Monument. Willcox Playa is alkalic crust where was lake in pleistocene epoch at the time wetter than present. Alkalic crust was made of Ca, Na, K etc. There are sand dunes around here where was lake side in the past. We found many kinds of fossils at the 2,000ft thick horizons of valley alluvium. Pediment and alluvium bordered at the base of Mt. Dragoon wavily. Exfoliation and spalling and sheeting resulted in boulders around here. Tucson is alluvial plain filled in thick 7,0000ft valley. Volcano, fault, erosion, alluvium were and are processing in this area.

• Journal of the Korean Society of Environmental Restoration Technology
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• v.1 no.1
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• pp.3-17
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• 1998

The purposes of this study is to investigate the possibility of planting trees at space land in the riverside. The space land is for the green space. Calculating the plantable space in the representation section and the flood flowing stability of the existing banks based on the hydrological and meteorological data of the Kap-Chon riverbasin located in Tae-jon, the following results are drawn. (1) The flood discharges in each flow section are $698.7m^3/s$ in section 1, $654.6m^3/s$ in section 2, and $1353.3m^3/s$ in section 3 during 100 years recurrence interval. Because the designed-flood discharges in those sections are $1719.9m^3/s$, $2119.7m^3/s$, and $1512.8m^3/s$ respectively, safety for flood flowing is sufficient in existing banks. (2) The possible clearance for planting trees is 1.80m in section 1, 3.90m in section 2, and 0.01m in section 3. Planting clearance is enough in section 1 and 2. However, planting should be planned after estimating a rise-height due to the bridge piers, because many piers under riverine-highway are now on the construction in section 2. The section 3 does not have sufficient clearance for planting trees, but the planting is possible after getting enough flow area with slope by cutting the terrace land on the river artificially heightened. (3) In case of planting a tree 70cm diameter in $1m^2$ in section 1, the water level increases by 0.60m. Planting a tree in a $48m^2$ area increases the water level by 0.90m. Considering that plantable clearance is 1.8m in section 1, it is sufficient to flow safely. But if the trees are planted so compactly from the upper stream, expected heavy resistance is expected due to caught materials on the trees. So, trees have to be planted widely in upper streams but compactedly in lower streams. (4) The river width without changing, Kap-Chon's flow channel can be snaked in accordance with the nature law the wide terrace land in the riverside. Decreased flow area due to planting trees will be compensated by the inclination of terrace land. And, it is theoretically proved that the flood discharge is safe even though the terrace land on the river is parked similar to the nature. Planting trees in the terrace land of the Kap-chon river to the extent that flood flowing is not adversely affected, we can get the enjoyable park to citizens not spending expensive cost. It also contributes to the recovery of ecosystem, which gives the natural beauty of river and shade to citizens and becomes good natural-educational places for children.

• Proceeding of Spring/Autumn Annual Conference of KHA
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• 2009.11a
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• pp.132-137
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• 2009

The purpose of this study was to suggest urban regeneration methods for deteriorated downtown residential area, considering the development condition of urban blocks. Through the research that are based on literature, field survey, urban planning map and local experts consulting, it found out suitable sites for development such as a deteriorated residential zone or a unused site and it was deduced eight development types from analyzing the characters of developable sites. And then it is suggested various housing forms which were applied to eight development types of developable sites. The consequences of this research are summarized as follows. There are various housing forms by eight development types; block housing, low rise-high density court housing, medium low rise-high density housing, urban housing for low-income groups belong to T1-development of urban strategic position; block housing, housing on hilly site, semi-detached house, lodging house, urban housing for low-income groups, elderly housing belong to T2-development for living benefit; block housing, low rise-high density court housing, housing on hilly site, low rise housing, lodging housing, urban housing for low-income groups, elderly housing belong to T3-development of a small-scale rental housing; block housing, low rise-high density court housing, medium low rise-high density housing, terrace-house, housing on hilly site, low rise housing, block-typed detached house, semi-detached house, cluster-typed low rise housing, town house, urban housing for low-income groups belong to T4-residential environment renewal development; terrace-house, housing on hilly site, low rise housing, block housing, semi-detached house belong to T5-development of a small-scale housing; terrace-house, housing on hilly site, low rise housing, cluster-typed low rise housing belong to T6-development to adapt natural environment; block housing, low rise-high density court housing, low rise housing, block-typed detached house, town house belong to T7-development for community; block housing, low rise-high density court housing block housing, medium low rise-high density housing, terrace-house, housing on hilly site, low rise housing, elderly housing belong to T8-development of environment-friendly.

• Journal of the Korean Geographical Society
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• v.49 no.1
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• pp.1-17
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• 2014

This study estimates geomorphological processes of fluvial terraces by uplifts and bedrock features, by the analyses of topography, distribution, formation age and incision rate of fluvial terraces using Gwang-cheon River in Uljin, Namdae-cheon River in Pyeonghae and Osip-cheon River in Yeongdeok located in the southern Taebaek Mountain Range. The tectonic and climatic terraces I in the upper reaches of Gwang-cheon River with an altitude from riverbed of 9~12m indicate the formation age of MIS 2 with a incision rate of 0.40m/ka. However, the tectonic and climatic terraces I in the upper reaches of Osip-cheon River with an altitude from riverbed of 7~10m show the formation age of MIS 3 with an incision rate of 0.10m/ka. These results suggest that the uplift rate in the Gwang-cheon River basin is likely to be higher than that in the Osip-cheon River basin. Unlike the lower reaches of Osip-cheon River, the thalassostatic terraces are not found in the lower reaches of Gwang-cheon River, because the basin has low maintainable ability of landforms in river valley due to high uplift rate and bedrock properties resistant to weathering and erosion. On the other hand, the lowest tectonic and climatic terraces in the study areas indicate different formative ages and the terraces during the cooling stage in interglacial as well as during interstadial are also found. Therefore, this study suggests that chronological method for fluvial terrace by the previous developmental model of climatic terrace should be reconsidered.

• The Korean Journal of Quaternary Research
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• v.4 no.1
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• pp.41-57
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• 1990

Gravel shapes of the terrace gravel sequences are compared with the present river gravels and beach gravels in the Pohang and its surrounding areas. Seventeen gravel textural parameters are divided into 5 groups based on R-mode factor analysis. Among them, three parameters (RDm, MPSm, SZstd) are selected for a test of discriminant possibility of palaeoenvironment of the terrace gravel deposits. Marine gravels are in the range of 0.49 to 0.75 in mean roundness, 0.46 to 0.78 in mean maximum projection sphericity and 0.39 to 1.85 in standard deviation of size, whereas river gravels are 0.28 to 0.51 in mean roundness, 0.66 to 0.72 in mean maximum projection sphericity and 1.04 to 1.81 in standard deviation of size. For practical access to the palaeoenvironment discrimination, a bivariant diagram between mean roundness and mean maximum projection sphericity is the most effective. The marine terrace gravels are plotted within the variation range of present beach gravels and show 0.49 to 0.71 in mean roundness and 0.59 to 0.66 in mean maximum projection sphericity. The gravels of river terrace vary within the range of gravels derived from present river bed and are characterized as 0.36 to 0.48 in mean roundness and 0.66 to 0.71 in mean maximum projection sphericity.