scholarly journals The effectiveness of polder systems on peak discharge capping of floods along the middle reaches of the Elbe River in Germany

2007 ◽  
Vol 11 (4) ◽  
pp. 1391-1401 ◽  
Author(s):  
S. Huang ◽  
J. Rauberg ◽  
H. Apel ◽  
M. Disse ◽  
K.-E. Lindenschmidt
Keyword(s):  
Spatial Differentiation ◽  
River System ◽  
Peak Discharge ◽  
Computational Time ◽  
Elbe River ◽  
Flood Peak ◽  
Monte Carlo Techniques ◽  
Main River ◽  
The Elbe River ◽  
Computational Resources

Abstract. In flood modelling, many one-dimensional (1-D) hydrodynamic models are too restricted in capturing the spatial differentiation of processes within a polder or system of polders and two-dimensional (2-D) models are very demanding in data requirements and computational resources. The latter is an important consideration when uncertainty analyses using the Monte Carlo techniques are to complement the modelling exercises. This paper describes the development of a quasi-2-D modeling approach, which still calculates the dynamic wave in 1-D but the discretisation of the computational units are in 2-D, allowing a better spatial representation of the flow in polders and avoiding large additional expenditure on data pre-processing and computational time. The model DYNHYD (1-D hydrodynamics) from the WASP5 modeling package was used as a basis for the simulations and extended to incorporate the quasi-2-D approach. A local sensitivity analysis shows the sensitivity of parameters and boundary conditions on the filling volume of polders and capping of the peak discharge in the main river system. Two flood events on the Elbe River, Germany were used to calibrate and test the model. The results show a good capping effect on the flood peak by the proposed systems. The effect of capping reduces as the flood wave propagates down stream from the polders (up to 0.5 cm of capping is decreased for each additional kilometer from the polder).

scholarly journals The effectiveness of polder systems on peak discharge capping of floods along the middle reaches of the Elbe River in Germany

2007 ◽  
Vol 4 (1) ◽  
pp. 211-241 ◽  
Author(s):  
S. Huang ◽  
J. Rauberg ◽  
H. Apel ◽  
K.-E. Lindenschmidt
Keyword(s):  
Spatial Differentiation ◽  
River System ◽  
Peak Discharge ◽  
Computational Time ◽  
Elbe River ◽  
Flood Peak ◽  
Monte Carlo Techniques ◽  
Main River ◽  
The Elbe River ◽  
Computational Resources

Abstract. In flood modelling, many one-dimensional (1-D) hydrodynamic models are too restricted in capturing the spatial differentiation of processes within a polder or system of polders and two-dimensional (2-D) models are very demanding in data requirements and computational resources. The latter is an important consideration when uncertainty analyses using the Monte Carlo techniques are to complement the modelling exercises. This paper describes the development of a quasi-2-D modeling approach, which still calculates the dynamic wave in 1-D but the discretisation of the computational units is in 2-D, allowing a better spatial representation of the flow in polders and avoiding large additional expenditure on data pre-processing and computational time. The model DYNHYD (1-D hydrodynamics) from the WASP5 modeling package was used as a basis for the simulations and extended to incorporate the quasi-2-D approach. A local sensitive analysis shows the sensitivity of parameters and boundary conditions on the filling volume of polders and capping of the peak discharge in the main river system. Two flood events on the Elbe River, Germany were used to calibrate and test the model. The results show a good capping effect on the flood peak by the proposed systems. The effect of capping reduces as the flood wave propagates downstream from the polders (up to 0.5 cm of capping is lost for each additional kilometer from the polders).

scholarly journals Quasi 2D hydrodynamic modelling of the flooded hinterland due to dyke breaching on the Elbe River

2007 ◽  
Vol 11 ◽  
pp. 21-29 ◽  
Author(s):  
S. Huang ◽  
S. Vorogushyn ◽  
K.-E. Lindenschmidt
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Analysis ◽  
Computational Time ◽  
Test Case ◽  
Elbe River ◽  
2D Modeling ◽  
Monte Carlo Techniques ◽  
Extreme Flood ◽  
The Elbe River ◽  
Computational Resources

Abstract. In flood modeling, many 1D and 2D combination and 2D models are used to simulate diversion of water from rivers through dyke breaches into the hinterland for extreme flood events. However, these models are too demanding in data requirements and computational resources which is an important consideration when uncertainty analysis using Monte Carlo techniques is used to complement the modeling exercise. The goal of this paper is to show the development of a quasi-2D modeling approach, which still calculates the dynamic wave in 1D but the discretisation of the computational units are in 2D, allowing a better spatial representation of the flow in the hinterland due to dyke breaching without a large additional expenditure on data pre-processing and computational time. A 2D representation of the flow and velocity fields is required to model sediment and micro-pollutant transport. The model DYNHYD (1D hydrodynamics) from the WASP5 modeling package was used as a basis for the simulations. The model was extended to incorporate the quasi-2D approach and a Monte-Carlo Analysis was used to conduct a flood sensitivity analysis to determine the sensitivity of parameters and boundary conditions to the resulting water flow. An extreme flood event on the Elbe River, Germany, with a possible dyke breach area was used as a test case. The results show a good similarity with those obtained from another 1D/2D modeling study.

Morphological Variation in the Burhot (Lota lota) and Recognition of the Subspecies: A Review

1970 ◽  
Vol 27 (10) ◽  
pp. 1757-1765 ◽  
Author(s):  
Karel Pivnička
Keyword(s):  
New England ◽  
Western Europe ◽  
River System ◽  
The United States ◽  
Danube River ◽  
Elbe River ◽  
Caudal Peduncle ◽  
Volga River ◽  
Lota Lota ◽  
The Elbe River

A review of the morphometric and meristic variations in 893 specimens of the burbot (Lota lota) from 18 freshwater areas representing the range of the species, showed that Lota lota lacustris (= maculosa), with a short, high caudal peduncle and low meristic values may be distinguished from Lota lota lota, with a long, low caudal peduncle and high meristic values. Lota l. lota occurs from the Volga River system through Siberia and Alaska to the Mackenzie River system in Canada. The populations from the Elbe River and the Danube River are on the periphery of this subspecies, to which it clearly belongs. Lota l. lacustris occurs in southernmost Canada, the United States, and western Europe. Both Lota l. leptura (Hubbs and Schultz, 1941) and Lota l. kamensis (Markun, 1936) are synonyms of Lota l. lota (Linnaeus, 1758).Clinal variations in the means for various characters of the species were found as follows. All meristic values and length of the caudal peduncle as a percentage of standard body length, in general, increased eastward from western Europe as far as 120°E and then decreased toward New England. Predorsal and preanal lengths generally increased eastward from western Europe to New England. The following generally decreased from western Europe eastward to 120°E and then increased toward New England: head length, interorbital width, postpectoral length, and depth of caudal peduncle as a percentage of standard length; depth of caudal peduncle as a percentage of its length; and postpectoral length as a percentage of predorsal length.

Organotins: their analysis and assessment in the Elbe river system, Northern Germany

1994 ◽  
Vol 350 (1-2) ◽  
pp. 77-84 ◽  
Author(s):  
R. -D. Wilken ◽  
J. Kuballa ◽  
E. Jantzen
Keyword(s):  
River System ◽  
Northern Germany ◽  
Elbe River ◽  
The Elbe River

scholarly journals DAS Ampal Analisa Fungsi dan Pengaruh Bangunan Pengendali Banjir DAS Ampal Kota Balikpapan

2018 ◽  
Vol 2 (3) ◽  
pp. 39
Author(s):  
Rossana Margaret Kadar Yanti ◽  
Edijatno Edijatno ◽  
Umboro Lasminto
Keyword(s):  
Catchment Area ◽  
Flood Control ◽  
Peak Discharge ◽  
Flood Peak ◽  
Flood Discharge ◽  
Main River ◽  
The Difference

Ampal Catchment Area has 25.273 km2 area and 4.699 km main river length, which planned to have 13 flood control construction. Until 2017, this catchment area has only three flood control construction. The watershed has only three built-in batters that are used to reduce the amount of flood discharge flowing on the Ampal river. Based on these conditions, it is necessary to analyze the magnitude of the difference of flood peak discharge on the existing condition (three bendali) compared with the condition of the plan (thirteen bendali). Therefore, analyzed the function and influence of flood control construction in Ampal Catchment Area by counting the flood peak discharge in each condition. From the analysis result, obtained the amount of peak discharge flowing in Ampal river existing condition is equal to 170,40 m3/s while at the condition of plan is equal to 83,80 m3/s. From the results of analysis, it is stated that the magnitude of the decrease of debit (ΔQ) after all the builds is 86.60 m3/s.

Identifying factors leading to hurricane induced landslide dam flood risk in Dominica

2020 ◽  
Author(s):  
Mark Trigg ◽  
Andrew Carr ◽  
Stephanie Trigg
Keyword(s):  
At Risk ◽  
Landslide Dam ◽  
River System ◽  
Flood Pulse ◽  
Landslide Susceptibility Mapping ◽  
Landslide Risk ◽  
Flood Peak ◽  
Main River ◽  
Design Changes ◽  
Landslide Event

<p>Landslide dams occur when the debris from a landslide blocks, fully or partially, a river channel or floodplain. The landslide event often occurs during periods of heavy, intense rainfall, for example during hurricanes and tropical storms. This means that the blocked river is usually at high flow when the dam occurs, resulting in large volumes of water building up behind the dam. Due to the unconsolidated nature of the material blocking the river and large volumes of water behind it, it often does not take long for the dam to fail, releasing an enormous pulse of flood water down the river system. This flood pulse can cause enormous damage and modelling estimates show it can result in a flood peak from a catchment in the order of 3 to 4 times the flood peak that might be expected from the catchment under none-landside conditions. The island of Dominica in the Caribbean has suffered recently from two major catastrophic events, 2015 Tropical Storm Erica and 2017 Hurricane Maria. During these events there were many such landslide dam burst that brought significant damage to infrastructure such as bridges, housing as well as loss of lives.</p><p>We report on current research into understanding landslide dam risk on the island, funded by the World Bank as part of efforts to increase resilience of the islands infrastructure to hurricane induced hazards. The island has over one hundred main river systems, all of which are relatively steep due to the volcanic nature of the island and have therefore have significant landslide risk. We are aiming to answer the following questions with our research: (i) Which river catchments are most at risk from these dam-burst events and why; (ii) What evidence is available for landslides that blocked rivers during the last two major events; (iii) What are the scale of these events. We are carrying out geospatial analysis using a combination of landslide susceptibility mapping, river proximity analysis and LiDAR data recently collected for the island as well as landslide inventories for validation.</p><p>We will be using the understanding gained from this research to identify catchments most at risk, what infrastructure is exposed to this risk, what mitigation might be effective in reducing the risk, and finally what design changes to the infrastructure could be made to make it more resilient to these hazards.</p>

scholarly journals Geostatistical classification of dynamics of water quality changes in the Elbe river basin

Geografie ◽  
2005 ◽  
Vol 110 (1) ◽  
pp. 15-31
Author(s):  
Jakub Langhammer
Keyword(s):  
Water Quality ◽  
River Basin ◽  
River System ◽  
Quality Changes ◽  
Elbe River ◽  
Critical Areas ◽  
Emission Volume ◽  
Elbe River Basin ◽  
The Elbe River ◽  
And Control

With regard to the water quality changes, the area of the Czech part of the Elbe river basin is extraordinarily dynamic. In the 20th century it experienced an enormous increase of load of pollution. Since the beginning of the 1990's due to the political and economical changes, we have witnessed a particularly intensive decrease in the emission volume and a related increase in water quality of watercourses. However, positive changes in the pollution load balance have occurred mainly in the biggest watercourses and these changes have not been accompanied by similar development in the whole river system. Using a newly created classification methodology the basic models of dynamics of water quality changes in the Elbe river basin have been derived. Based on GIS geostatistical analysis, regions with analogous water quality development trends have been defined for selected parameters and critical areas have been identified. It has become apparent that the prevailing part of the Elbe river basin has been experiencing a gradual increase in pollution. In addition, after a previous decrease, a number of watercourses experienced a recurrence of the increase in load. These areas are priorities for further development and control of surface water protection against pollution.

scholarly journals Unmanned Aerial Systems-Aided Post-Flood Peak Discharge Estimation in Ephemeral Streams

2020 ◽  
Vol 12 (24) ◽  
pp. 4183
Author(s):  
Emmanouil Andreadakis ◽  
Michalis Diakakis ◽  
Emmanuel Vassilakis ◽  
Georgios Deligiannakis ◽  
Antonis Antoniadis ◽  
...  
Keyword(s):  
Flash Flood ◽  
Traditional Approach ◽  
Peak Discharge ◽  
Unmanned Aerial Systems ◽  
Monitoring Networks ◽  
Response Dynamics ◽  
Hydrologic Modelling ◽  
Flood Peak ◽  
Field Evidence ◽  
Aerial Systems

The spatial and temporal scale of flash flood occurrence provides limited opportunities for observations and measurements using conventional monitoring networks, turning the focus to event-based, post-disaster studies. Post-flood surveys exploit field evidence to make indirect discharge estimations, aiming to improve our understanding of hydrological response dynamics under extreme meteorological forcing. However, discharge estimations are associated with demanding fieldwork aiming to record in small timeframes delicate data and data prone-to-be-lost and achieve the desired accuracy in measurements to minimize various uncertainties of the process. In this work, we explore the potential of unmanned aerial systems (UAS) technology, in combination with the Structure for Motion (SfM) and optical granulometry techniques in peak discharge estimations. We compare the results of the UAS-aided discharge estimations to estimates derived from differential Global Navigation Satellite System (d-GNSS) surveys and hydrologic modelling. The application in the catchment of the Soures torrent in Greece, after a catastrophic flood, shows that the UAS-aided method determined peak discharge with accuracy, providing very similar values compared to the ones estimated by the established traditional approach. The technique proved to be particularly effective, providing flexibility in terms of resources and timing, although there are certain limitations to its applicability, related mostly to the optical granulometry as well as the condition of the channel. The application highlighted important advantages and certain weaknesses of these emerging tools in indirect discharge estimations, which we discuss in detail.

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