Evaluation of Flood Control Stability for Large River using Index Assessment Method and Analysis on the Effect of River Management in Nakdong River Networks

2016 ◽  
Vol 16 (2) ◽  
pp. 413-426
Author(s):  
Jaehyuk Lee ◽  
Eunku Lee ◽  
Euihyuk Yoon ◽  
Hyunsuk Shin
Keyword(s):  
Flood Control ◽  
River Management ◽  
Large River ◽  
Assessment Method ◽  
River Networks ◽  
Nakdong River ◽  
Control Stability

Water Quality Aspects of the Nakdong Estuary Barrage

1984 ◽  
Vol 16 (1-2) ◽  
pp. 243-252 ◽  
Author(s):  
J W van Sluis ◽  
L Lijklema
Keyword(s):  
Water Quality ◽  
Water Quality Management ◽  
Sewage Treatment ◽  
Large River ◽  
Model Verification ◽  
Nakdong River ◽  
Treated Effluent ◽  
Quality Aspects ◽  
The Nakdong River ◽  
Few Data

As a result of the construction of a barrage in the estuary of the Nakdong river the size of the estuary will be considerably reduced. In addition, a large river reservoir is created upstream of the barrage. Main points of interest are the effects of the discharge of raw sewage and treated effluent into the Nakdong river on the water quality in the projected reservoir and the water quality forecasts for the remaining part of the estuary, in relation with the existing plans for sewerage and sewage treatment for the city of Busan. In addition, measures to reduce the effects of the barrage and the outline of a water quality management programme are presented. Special consideration is given to the methodological aspects of the water quality study, i.e. the selection and use of mathematical models in a situation where input data are rather uncertain and only very few data for parameter estimation and model verification are available.

scholarly journals Planning of technical flood retention measures in large river basins under consideration of imprecise probabilities of multivariate hydrological loads

2009 ◽  
Vol 9 (4) ◽  
pp. 1349-1363 ◽  
Author(s):  
D. Nijssen ◽  
A. Schumann ◽  
M. Pahlow ◽  
B. Klein
Keyword(s):  
Flood Control ◽  
Large River ◽  
Control Measures ◽  
Imprecise Probabilities ◽  
Flood Events ◽  
Modeling Tools ◽  
Statistical Characterization ◽  
Design Floods ◽  
Known Unknowns ◽  
Flood Waves

Abstract. As a result of the severe floods in Europe at the turn of the millennium, the ongoing shift from safety oriented flood control towards flood risk management was accelerated. With regard to technical flood control measures it became evident that the effectiveness of flood control measures depends on many different factors, which cannot be considered with single events used as design floods for planning. The multivariate characteristics of the hydrological loads have to be considered to evaluate complex flood control measures. The effectiveness of spatially distributed flood control systems differs for varying flood events. Event-based characteristics such as the spatial distribution of precipitation, the shape and volume of the resulting flood waves or the interactions of flood waves with the technical elements, e.g. reservoirs and flood polders, result in varying efficiency of these systems. Considering these aspects a flood control system should be evaluated with a broad range of hydrological loads to get a realistic assessment of its performance under different conditions. The consideration of this variety in flood control planning design was one particular aim of this study. Hydrological loads were described by multiple criteria. A statistical characterization of these criteria is difficult, since the data base is often not sufficient to analyze the variety of possible events. Hydrological simulations were used to solve this problem. Here a deterministic-stochastic flood generator was developed and applied to produce a large quantity of flood events which can be used as scenarios of possible hydrological loads. However, these simulations imply many uncertainties. The results will be biased by the basic assumptions of the modeling tools. In flood control planning probabilities are applied to characterize uncertainties. The probabilities of the simulated flood scenarios differ from probabilities which would be derived from long time series. With regard to these known unknowns the bias of the simulations was considered by imprecise probabilities. Probabilities, derived from measured flood data were combined with probabilities which were estimated from long simulated series. To consider imprecise probabilities, fuzzy sets were used to distinguish the results between more or less possible design floods. The need for such a differentiated view on the performance of flood protection systems is demonstrated by a case study.

River networks system changes and its impact on storage and flood control capacity under rapid urbanization

2016 ◽  
Vol 30 (13) ◽  
pp. 2401-2412 ◽  
Author(s):  
Liu Yang ◽  
Youpeng Xu ◽  
Longfei Han ◽  
Song Song ◽  
Xiaojun Deng ◽  
...  
Keyword(s):  
Flood Control ◽  
River Networks ◽  
Rapid Urbanization ◽  
System Changes

scholarly journals Effects of Weir Construction on Phytoplankton Assemblages and Water Quality in a Large River System

2018 ◽  
Vol 15 (11) ◽  
pp. 2348 ◽  
Author(s):  
Hae-Jin Lee ◽  
Hae-Kyung Park ◽  
Se-Uk Cheon
Keyword(s):  
Water Quality ◽  
Chlorophyll A ◽  
River System ◽  
Large River ◽  
Anthropogenic Factors ◽  
Centric Diatom ◽  
Nakdong River ◽  
Biological Variables ◽  
Physical Chemical ◽  
The Nakdong River

Flow regulation is one of the most common anthropogenic factors affecting rivers worldwide. In Korea, 16 weirs were constructed along four major rivers from 2009 to 2012. This study aimed to elucidate initial changes in physical, chemical, and biological variables after the construction of consecutive weirs on the Nakdong River, a major large river system. Water quality variables and phytoplankton cell densities were investigated at eight representative sites and compared with the data recorded before the weir construction. There were spatial and temporal changes in the hydraulic retention time (HRT), total phosphorus (TP), and chlorophyll a concentrations among the eight weir sections. HRT increased after the weir construction, while TP and chlorophyll a tended to decrease from the middle to lower section of the Nakdong River. Furthermore, differences were observed in the phytoplankton community composition between 2006–2007 and 2013. There was a marginal decrease in the duration of centric diatom (Stephanodiscus hantzschii) blooms after weir construction. However, Microcystis aeruginosa proliferated more extensively during summer and autumn than it did before the weir construction. Our results suggest that changes in hydrological factors, in response to consecutive weir construction, may contribute to greater physical, chemical, and ecological variability.

scholarly journals Use of high-intensity data to define large river management units: A case study on the lower Waikato River, New Zealand

River Systems ◽  
2015 ◽  
Vol 21 (4) ◽  
pp. 183-202 ◽  
Author(s):  
Michael A. Pingram ◽  
Kevin J. Collier ◽  
David P. Hamilton ◽  
Bruno O. David ◽  
Brendan J. Hicks
Keyword(s):  
New Zealand ◽  
High Intensity ◽  
River Management ◽  
Large River ◽  
Intensity Data ◽  
Management Units ◽  
Waikato River

Flood Control Impact Assessment for Gas Station Construction Projects

2012 ◽  
Vol 212-213 ◽  
pp. 721-724
Author(s):  
Wen Hai Yang ◽  
Guo Hui Yu ◽  
Tao Liu
Keyword(s):  
Impact Assessment ◽  
Construction Projects ◽  
Flood Control ◽  
Construction Project ◽  
River Management ◽  
River Flood ◽  
Flood Impact ◽  
Gas Station ◽  
Control Evaluation

With the actual engineering as an example, the content and method of flood impact assessment in the river management of gas station construction project within the scope of river management was discussed in this paper. Construction project to review the job has certain referenced effect, so that the flood control evaluation can reflect the effect of the construction project on flood control, in order to take measures to ensure the safety of river flood.

scholarly journals Integrated simulation of physical, chemical and ecological processes for river management

1999 ◽  
Vol 1 (1) ◽  
pp. 33-58 ◽  
Author(s):  
Peter Goodwin ◽  
Thomas B. Hardy
Keyword(s):  
Flood Control ◽  
Management Strategies ◽  
Ecological Integrity ◽  
River System ◽  
River Management ◽  
Control Measures ◽  
New Paradigm ◽  
Ecological Processes ◽  
Systematic Analysis ◽  
Ecological Resources

River management is a rapidly evolving science and recent major floods have prompted a re-examination of traditional approaches such as channelization, levees, flood walls and dams. These flood control measures are capital intensive, require significant maintenance costs, only protect local regions, and often require a tradeoff with ecological resources. Further, recent analyses have shown that the intended benefits and hydraulic performances are not achieved. A new paradigm in river management is evolving, which requires a broad range of design objectives to be met that include reduction in flood risks, ecological enhancement, recreation and aesthetics, as well as complying with strict environmental protection legislation. These more complex projects require extensive data and simulation tools to assist decision makers and communities in selecting management strategies which offer the maximum benefits, whilst preserving and enhancing the ecological integrity of the river system. A framework for the systematic analysis of the river ecosystem is outlined and illustrated by examples from the Western U S A.

Historical Changes in Large River Fish Assemblages of the Americas

2005 ◽  
Keyword(s):  
Fish Assemblage ◽  
Fish Assemblages ◽  
River Management ◽  
Large River ◽  
Large Rivers ◽  
Pertinent Literature ◽  
Historical Changes ◽  
Time To Learn ◽  
River Fish

<em>Abstract.</em>—This book’s objective is to document historical changes in the fish assemblages of large American rivers, and to determine patterns in and rationale for those changes. In this chapter, we review pertinent literature on large rivers and fish assemblages worldwide and briefly introduce the chapters. We expect that the information contained in this book will aid river management in general, and stimulate similar historical fish assemblage studies elsewhere. There will never be a better time to learn and understand what has been changed and to reverse or slow undesirable changes.

Sign in / Sign up

Export Citation Format

Share Document