• Title/Summary/Keyword: Basin Area

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Estimation of Average Roughness Coefficients of Bocheong Stream Basin (보청천 유역의 평균조도계수 산정)

  • Jeon, Min-Woo;Lee, Hyo-Sang;Ahn, Sang-Uk;Cho, Young-Soo;Jeon, Man-Woo
    • Proceedings of the Korea Water Resources Association Conference
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    • 2009.05a
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    • pp.1306-1310
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    • 2009
  • The roughness coefficients were estimated by the Manning's equation for the measured stage and flow velocity of Bocheong stream basin in Kum river. The relationships between the estimated roughness coefficients and the geomorphologic factors were formulated by the linear, logarithmic, exponential and power type function, thereafter correlation equations were presented. The correlation analysis was performed between the measured stream length and the basin area of Bocheong stream basin by the linear, logarithmic, exponential and power type function, and correlation equation for the stream length was given. The roughness coefficient has strong correlationship with stream slope, but low correlation coefficients with stream length and basin area. For the correlationship with the roughness coefficients and the stream slope, the logarithmic type function has the smallest correlation coefficient, on the other hand, the exponential type function has the largest correlation coefficient. For the relationship between the stream length and the basin area, the correlation coefficient of the logarithmic type function shows the smallest value, linear type function shows the largest value.

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On the maximum Depth-Area-Duration for Storms in Nakdong River Basin (낙동강유역의 최대 DAD에 관하여)

  • 이광호
    • Water for future
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    • v.7 no.2
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    • pp.92-98
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    • 1974
  • The DAD for Nakdong River Basin is studied on the basis of qselected storms (1916~1970) by WMO Standard method. The maximum DAD BAlue for a storm period of 24hrs assuming that the basin area is estimated as about $2,500\textrm{km}^2$ comes out to be 153mm. The investigation appears to be supporting a conclusion that the Horton's formula is also applicable to this basin.

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The System of Sewage and Domestic Wastewater Treatment Plants in Tan-Sui River Basin

  • Ko, Chun-Han
    • Proceedings of the Korean Environmental Health Society Conference
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    • 2002.04a
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    • pp.26.2-39
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    • 2002
  • Tan-Sui River Basin covers Taipei metropolitan area of 2,726 square kilometers with more than six million residents. Since 1988, Taiwan government started to plan and construct an integrated sewerage system, consisted by both separated and concentrated trunk sewers, wastewater treatment plants and ocean outfalls. This presentation will introduce the master plan and major facilities of Tan-Sui River Basin sewerage system. Other measures to protect general water quality and the environment of adjacent river basin area of Tan-Sui River and her tributaries by Taiwan EPA will be presented as well.

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Operation of Experimental Basin(Yi-dong Basin) (시험유역운영(이동유역))

  • 박재홍;김진택;박지환
    • Proceedings of the Korea Water Resources Association Conference
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    • 2003.05b
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    • pp.611-614
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    • 2003
  • Yi-dong experimental basin is operated for research on the rural basin characteristics and accumulation of a long term data by hydrological observation equipments. It is basin area 9,440ha, length 14.4km and slope 0.67%. Hydrological observation network is constructed of rainfall meter 4points, reservoir storage level 3points and river water level 2points.

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Change characteristic of basin topographical parameters according to the threshold area of minimum order stream (최소차 하천의 임계면적에 따른 유역 지형매개변수의 변화특성)

  • Ahn Seung-Seop;Park Ro-Sam;Kim Jong-Ho;Lim Ki-Seok;Song Si-Hoon
    • Journal of Environmental Science International
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    • v.14 no.1
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    • pp.33-40
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    • 2005
  • The size of minimum order stream has a very sensitive effect on runoff analysis model using the divergence characteristic of stream. Therefore, in this study, the threshold area of minimum order stream has been examined the change characteristic of topographical parameters. The subject basin of the research was the upper basin of the Kumho water gage station which is located in the middle of the Kumho river. The 1:25,000 numerical geography which was constructed $10{\times}10m$ mesh was used. The range of investigation of topographical parameters are number of stream order, length, area, slope, basin relief, sinuosity ratio, drainage density and total stream length etc. It was found from the result of analysis that the threshold value of minimum order stream has a very big effect on topographical parameters of basin. It was found that the threshold area of minimum ord er stream revealed under $0.10km^{2}.$ Furthermore, the parameters showed a serious change except for over $0.10km^{2}.$

Geomorphological Environment of Daejeon Basin and Its Influence Urbanization (지형을 중심으로 한 대전 지역의 이해)

  • Kee, Keun-Doh;Lee, Min-Ho
    • Journal of the Korean association of regional geographers
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    • v.8 no.2
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    • pp.229-246
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    • 2002
  • This study is a contribution to the geographical understanding of Daejeon Area, playing the role of principal center of Choongchong Province. This area has been urbanized associated with Daejeon Basin, an important natural unit in the middle part of South Korea. In order to understand Daejeon Area in geographer's view, it is necessary to elucidate geomorphological environment of Daejeon Basin and urban expansion pattern associating with it. Our research is converged into dual objectives: one, description and interpretation of basin's landforms; other, urban expansion relating with geomorphological condition. Daejeon's urban expansion has progressed from the border zone of Daejeon Basin toward into the basin, and then vice versa. Relating to rivers valleys in the basin, the urbanization in the basin has been extended from the river valleys of lower order toward those of higher order. Understanding of the geomorphological mosaique of Daejeon basin is an important base for that of urban mosaique of Daejeon City.

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Spatio-Temporal Analysis of Natural Area for Sustainable Watershed Management in the Ara River Basin, Japan (지속가능한 유역관리를 위한 자연지역의 시공간적 특성 분석 -일본 아라가와 유역을 대상으로-)

  • Lee, Seung-Eun;Tohru, Morioka
    • Journal of Environmental Science International
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    • v.15 no.5
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    • pp.461-469
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    • 2006
  • As a frontier of Sustainable Basin Research Initiative, we commenced a scenario-driven planning and evaluation research project which is to identify the strategic policy scenarios. As a part of the project, this study attempts to estimate the ecological impacts of land cover changes using landscape indices at the whole basin level. We analyzed spatio-temporal characteristics of natural area including forest, agricultural land, water area, barren which play an important role in nature-friendly sustainable watershed management. The results of analysis shelved that the size and diversity of natural area have been reduced, while patch number and isolation have been increased in proportion to urbanization in 1974, 1995 and four future scenarios in the Ara River Basin. Also, we estimated that the natural area could be conserved to some degree in the SD or DE scenarios with a concept of environment-friendly development and lifestyle. Various strategic environment policies may be evaluated and designed on the basis of the method, that is, scenario approach and landscape ecological analysis suggested in this study.

The Analysis of Soil Erosion in Water-pollutant Buffering Zone of Imha reservoir using Geo-Spatial Data (지형공간정보를 이용한 임하호 수변구역 토사유실 분석)

  • Lee, Geun-Sang;Hwang, Eui-Ho;Park, Jin-Hyeog;Chae, Hyo-Sok
    • Proceedings of the Korea Water Resources Association Conference
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    • 2006.05a
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    • pp.908-912
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    • 2006
  • Geology and terrain of Imha basin has a very weak characteristics to soil erosion, so much soil particles flow into Imha reservoir and bring about high density turbid water when it rains a lot. Especially, since the agricultural area of Imha basin is mainly located in river boundary, Imha reservoir has suffered from turbid water by soil erosion. Therefore, it is important to estimate the influence of soil erosion to establish efficient management of water-pollutant buffering zone for the reduction of turbid water. By applying GIS-based RUSLE model, this study can acquire 12.23% that is the ratio of soil erosion in water-pollutant buffering zone and is higher than area-ratio (9.95%) of water-pollutant buffering zone. This is why the area-ratio of agricultural district (27.24%) in water-pollutant buffering zone is higher than the area-ratio of agricultural district (14.96%) in Imha basin. Also as the result of soil erosion in sub-basin, Daegok basin shows highest soil erosion in water-pollutant buffering zone, second is Banbyeon_10 basin and last is Seosi basin.

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The Influence Analysis of GIS-based Soil Erosion in Water-pollutant Buffering Zone (GIS기반 수변구역의 토사유실 영향 분석)

  • Lee, Geun Sang;Hwang, Eui Ho
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.26 no.2D
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    • pp.335-340
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    • 2006
  • Geology and terrain of Imha basin has a very weak characteristics to soil erosion, so much soil particles flow into Imha reservoir and bring about high density turbid water when it rains a lot. Especially, since the agricultural area of Imha basin is mainly located in river boundary, Imha reservoir has suffered from turbid water by soil erosion. Therefore, it is important to estimate the influence of soil erosion to establish efficient management of water-pollutant buffering zone for the reduction of turbid water. By applying GIS-based RUSLE model, this study can acquire 12.23% that is the ratio of soil erosion in water-pollutant buffering zone and is higher than area-ratio (9.95%) of water-pollutant buffering zone. This is why the area-ratio of agricultural district (27.24%) in water-pollutant buffering zone is higher than the area-ratio of agricultural district (14.96%) in Imha basin. Also as the result of soil erosion in sub-basin, Daegok basin shows highest soil erosion in water-pollutant buffering zone, second is Banbyeon_10 basin and last is Seosi basin.

A Study on the Wave Generating Characteristics of the Multi-directional Irregular Wave Basin (다방향불규칙파 조파수조의 조파특성에 관한 연구)

  • SOHN Byung-Kyu;RYU Cheong-Ro
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.34 no.6
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    • pp.705-712
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    • 2001
  • It is of great importance to represent the directional ocean waves in a laboratory basin for hydraulic model tests. The directional ocean waves can be expressed as a linear superposition of a large number of component waves with different frequencies and propagating directions. The aim of the study is to check the wave generating characteristics by serpent-type wave generating system in PKNU (Pukyong National University) which is composed of 10 piston-type wave generators. In the experiment, spatial variation of irregular wave heights and propagating angles are measured in the multi-directional wave maker basin. Target wave directional spectrum is reproduced in the area of multi-directional wave maker basin. The directional spreading of the generated waves varied spacially in the basin. They differed from target spectrum as the measurement point becomes far from the center line normal to the generator face, The effective generation area where that target can be reproduced is limited to the triangular area attached the generator face. According to the results, it is emphasized that the effective experiment area in the basin considered wave generator characteristics should be determined in consideration of experimental conditions including structural shapes, water depth, wave directionality etc.

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