A Comparison of Geomorphological and Hydrological Methods for Delimitation of Flood Plain in the Mankyung River, Korea
30 Jun 2015-Ecology and resilient infrastructure (Korean Society of Ecology and Infrastructure Engineering)-Vol. 2, Iss: 2, pp 128-136
TL;DR: In this paper, two methods for delineation of a floodplain are proposed, which are used for evaluation of the function of a river, one of them is a geomorphology-based technique and the other is hydrology-based inundation analysis.
Abstract: Department of Hydro Science and Engineering, Korea Institute of Civil Engineering and Building Technology, Goyang 411-712, KoreaReceived 19 May 2015, revised 8 June 2015, accepted 23 June 2015, published online 30 June 2015ABSTRACT: River areas include channels, floodplains and all the areas affected by physical and ecological processes in river systems. It is noticeably different from present riparian zone which is bounded by dykes. In this study, two methods for delineation of a floodplain are proposed, which are used for evaluation of the function of a river. One of them is a geomorphology-based technique and the other is hydrology-based inundation analysis. For the Mankyung River, these two methods are applied to delineate the floodplain area. Areas delineated with both methods are mutually compared. The results show that the geomorphology-based method is suitable for the delineation of a valley bottom, including the floodplain in a broader sense, which is unlike an inundated area reflecting contemporary hydrologic conditions. Compared with other flood frequency areas, a 100-year flood inundation area was found reasonable to represent the spatial extent of a floodplain without regard to the longitudinal location along a river. However, it is necessary in certain rivers reach where the division of a channel exists to compare a geomorphological analysis on a valley bottom with an inundation area of different frequencies.KEYWORDS: Floodplain, HEC-RAS, LISFLOOD, Multi-resolution valley bottom flatness요 약: 하천공간이란 하천시스템과 관련된 물리적·생태적 프로세스에 영향을 받는 홍수터, 하도를 모두 포함하는 공간을 의미하므로, 제방에 의해 인위적으로 차단된 현재의 하천구역과는 분명히 구분된다. 본 연구에서는 하천기능 평가를 위한 공간경계를 결정하기 위하여 홍수터 공간을 획정하는 방안을 제시하고자 한다. 이를 위하여, 지형분석 방법과 범람분석 방법을 이용하였고, 각 방법으로 산정된 만경강 홍수터 공간을 비교, 검토하였다. 분석결과, 지형분석은 곡저의 추출에 적합하며 현재의 수문지형조건을 반영하는 범람공간과는 차이가 있음을 확인하였다. 또한 빈도별 범람면적을 비교함으로써, 하천 상류 혹은 하류 구간의 구분 없이, 100년 빈도 범람지역을 하천공간으로 획정하는 것이 타당할 것으로 판단되었다. 그러나, 하도의 분기가 발생되는 일부 구간에서는 지형학적 곡저 분석 결과와 다양한 빈도의 범람해석 결과와의 비교가 필요하다.핵심어: 홍수터, HEC-RAS, LISFLOOD, 다중해상도곡저평탄지수 *Corresponding author: c0gnitum@kict.re.kr
Citations
More filters
01 Jan 2006
TL;DR: In this paper, Clanak objasnjava novi pristup planiranju i ostvarivanju sustava obrane od poplava koji stavlja naglasak na aspekte okolisa.
Abstract: Integralno upravljanje poplavama je koncept usredotocen na spasavanje ljudskih života i smanjivanje steta od poplava kao i na pružanje podrske održivom razvoju okolisa sa stanovista upravljanja poplavama u okvirima ciljeva integralnog upravljanja vodnim resursima. Mnogi razlozi stvaraju brojne poteskoce prilikom integriranja postupaka i procesa vezanih sa smanjivanjem degradacije okolisa u sustav i praksu upravljanja poplavama. Osnovni problem se javlja u komunikacijskom jazu između razlicitih skupina ukljucenih u razumijevanje razlicitih perspektiva održivog razvoja. Clanak objasnjava novi pristup planiranju i ostvarivanju sustava obrane od poplava koji stavlja naglasak na aspekte okolisa te predstavlja pokusaj da se prevlada spomenuti jaz.
13 citations
TL;DR: In this article, the isolated former floodplain was explored by being overlapped on a digital elevation model (DEM), digital topographic map and design flood level using a geographical information system (GIS) in the Nakdong River basin.
Abstract: For the restoration of lateral connectivity between rivers and floodplains, it is important to find the isolated former floodplain (IFF) and to characterize its land use in Korean rivers which were channelized by levee constructions for flood protection. The aim of this study is to map the IFF and to assess its land use pattern in the Nakdong River, Korea. The isolated former floodplain was explored by being overlapped on a digital elevation model (DEM), digital topographic map and design flood level using a geographical information system (GIS) in the Nakdong River basin. The land use of the identified IFF was classified by land-use map. The total number of IFFs was 384 and their total area was . While IFFs were usually surrounded by mountain forest in the upper river area, they tended to be located on wide plain areas in the downstream area of Nakdong River. The land use pattern of IFFs was mostly farmland (73.9%) and urban areas (12.7%) in the river. The results of delineation and land use analysis of isolated former floodplain in the Nakdong River will be used as a base line data for planning stream restoration.
1 citations
Additional excerpts
...이중에서 홍수터의 경계를 설정하는 방법은 지형학 또는 수문학적으로 접근할 수 있다 (Kim et al. 2015)....
[...]
References
More filters
01 Jan 1989
2,121 citations
Additional excerpts
...수문학적 연결성이 확보된 홍수터는 생산성과 생물다양성이 가장 높은 생태계 중의 하나이며, 영양소, 퇴적물 및 유기물의 재분배와 순환, 수질 유지, 다양한 종의 생물에게 서 식지와 먹이를 공급하는 등 중요한 생태계 기능을 제 공한다 (Junk et al. 1989)....
[...]
TL;DR: To improve the conservation of biodiversity and the sustainable use of biological resources, immediate action is called for to create an international preservation network of free-flowing river systems and to rehabilitate exploited rivers in areas that lack unaffected watercourses.
Abstract: Seventy-seven percent of the total water discharge of the 139 largest river systems in North America north of Mexico, in Europe, and in the republics of the former Soviet Union is strongly or moderately affected by fragmentation of the river channels by dams and by water regulation resulting from reservoir operation, interbasin diversion, and irrigation. The remaining free-flowing large river systems are relatively small and nearly all situated in the far north, as are the 59 medium-sized river systems of Norway, Sweden, Finland, and Denmark. These conditions indicate that many types of river ecosystems have been lost and that the populations of many riverine species have become highly fragmented. To improve the conservation of biodiversity and the sustainable use of biological resources, immediate action is called for to create an international preservation network of free-flowing river systems and to rehabilitate exploited rivers in areas that lack unaffected watercourses.
1,651 citations
Additional excerpts
...제방에 의해 단절되어 홍수터 본연의 기능이 심각히 퇴화된 현재의 하천은 자연적인 하천공간이 그대로 유지되 는 경우가 거의 없으며, 대다수 하천의 경우 자연스 러운 하천조건을 참고하기 위한 일부 구간조차 부족 한 실정이다 (Dynesius and Nilsson 1994)....
[...]
Book•
01 Nov 2002
TL;DR: In this article, the authors define the concept of sustainable development as "the allocation of Depletable, Non-recyclable Energy Resources: Oil, Gas, Coal and Uranium".
Abstract: 1. Visions of the Future. 2. Valuing the Environment: Concepts. 3. Valuing the Environment: Methods. 4. Property Rights, Externalities, and Environmental Problems. 5. Sustainable Development: Defining the Concept. 6. The Population Problem. 7. The Allocation of Depletable and Renewable Resources. 8. Depletable, Non-recyclable Energy Resources: Oil, Gas, Coal and Uranium. 9. Recyclable Resources: Minerals, Paper, Glass, etc. 10. Replenishable but Depletable Resources: Water. 11. Reproducible Private-Property Resources: Agriculture. 12. Storable, Renewable Resources: Forests. 13. Renewable Common-Property Resources: Fisheries and Other Species. 14. Generalized Resource Scarcity. 15. Economics of Pollution Control: An Overview. 16. Stationary-Source Local Air Pollution. 17. Regional and Global Air Pollutants: Acid Rain and Atmospheric Modification. 18. Mobile -Source Air Pollution. 19. Water Pollution. 20. Toxic Substances. 21. Environmental Justice. 22. Development, Poverty, and the Environment. 23. The Quest for Sustainable Development. 24. Visions of the Future Revisited.
1,607 citations
TL;DR: In this article, a model for simulating flood inundation is presented, which is designed to operate with high-resolution raster Digital Elevation Models, which are becoming increasingly available for many lowland floodplain rivers and is based on what is hypothesise to be the simplest possible process representation capable of simulating dynamic flooding.
1,115 citations