scholarly journals Analysis of vegetation controls on bank erosion rates, Clark Fork of the Columbia River, Deer Lodge Valley, Montana

2001 ◽  
Keyword(s):  
Columbia River ◽  
Bank Erosion ◽  
Erosion Rates ◽  
Deer Lodge

scholarly journals Predicting the annual erosion rates on a small stream by the BANCS model

2019 ◽  
Vol 14 (No. 4) ◽  
pp. 200-211
Author(s):  
Zuzana Allmanová ◽  
Mária Vlčková ◽  
Martin Jankovský ◽  
Michal Allman ◽  
Helena Hlavatá
Keyword(s):  
Hazard Index ◽  
Bank Erosion ◽  
Strong Relationship ◽  
Real Relationship ◽  
Small Stream ◽  
The Real ◽  
Erosion Rates ◽  
Erosion Prediction ◽  
Small Streams ◽  
The Relationship

The erosion of streambanks causes soil loss and degrades the stream habitat. To optimize the prevention of bank erosion, we first need to determine the most vulnerable places on banks. This can be done by the BANCS model. However, data are still missing on its accuracy in small streams. We measured the real annual erosion rates on 18 experimental sections established on the Lomnická stream. Using the Near Bank Stress (NBS) and Bank Erosion Hazard Index (BEHI) we developed the erosion prediction curves and evaluated the relationship between these two indices and the real annual erosion rates. We found a strong relationship between BEHI and real annual erosion rates, with R<sup>2</sup> = 0.72. The relationship between the NBS index and real annual erosion rates was also strong, with R<sup>2</sup> = 0.53. Then we constructed erosion prediction curves for very high and extreme BEHI and for moderate and high BEHI. Despite the strong correlation between BEHI and annual erosion rates, the prediction curves had no real relationship with real annual erosion rates, with R<sup>2</sup>= 0.004 and 0.15, respectively.  

Effects of simulated water level management on shore erosion rates. Case study: Baskatong Reservoir, Québec, Canada

2001 ◽  
Vol 28 (3) ◽  
pp. 482-495 ◽  
Author(s):  
Diane Saint-Laurent ◽  
Bachir N Touileb ◽  
Jean-Phillippe Saucet ◽  
André Whalen ◽  
Benoit Gagnon ◽  
...  
Keyword(s):  
Bank Erosion ◽  
Water Levels ◽  
Reservoir Water ◽  
Field Surveys ◽  
Erosion Rates ◽  
Sandy Material ◽  
Water Level Management ◽  
Wave Erosion ◽  
Main Factor

This study was carried out as part of a feasibility study on the construction of a hydroelectric generating station at Mercier dam at the outlet of the Baskatong reservoir in Québec. The study dealt mainly with a comparison of the current and future bank erosion rates of the reservoir. Given the year of impounding of the Baskatong reservoir, i.e., 1927, it was possible to track bank erosion rates using field surveys and photogrammetric and numerical analyses. It was noted that in certain areas, such as Du Diable Bay and Windigo Bay, the Baskatong reservoir banks were substantially affected by erosion. Estimates indicate that the banks have receded by about 10 to 15 m over a 20-year period. The banks most affected by erosion are those containing sandy material of fluvioglacial or glaciolacustrine origin with bluffs greater than 2 m in height and characterized by the longest fetches. In one section of Windigo Bay, banks had receded by about 30 m in 20 years. Wave action is the main factor responsible for bank erosion, especially in areas highly exposed to long fetches. In fact, there is a correlation between bank erosion rates, fetch distribution, and the erosive energy of waves. It has been noted that receding banks with the highest erosion rates are linked to the greatest wave erosion energy. Based on the values obtained using simulated reservoir water levels, while taking into account the future construction of a new generating station, bank erosion rates appear to be comparable to those measured under actual conditions, though erosion rates could increase by about 28–30% in the areas most affected by erosion at the present time.Key words: bank erosion, waves and fetch, erosion rates estimated, Baskatong Reservoir, Québec, Canada.

scholarly journals Evolução Hidrodinâmica e Processos Erosivos Marginais nos Canais do Sistema de Inundação do Alto Rio Paraná, Região Centro-Sul do Brasil

2001 ◽  
Vol 28 (2) ◽  
pp. 161
Author(s):  
PAULO CÉSAR ROCHA ◽  
EDVARD ELIAS DE SOUZA FILHO ◽  
ÉDER COMUNELLO ◽  
GERALDO TERCEIRO CORREA
Keyword(s):  
Fluvial Geomorphology ◽  
Bank Erosion ◽  
Large River ◽  
Paraná River ◽  
Alluvial Plain ◽  
Exponential Regression ◽  
Erosion Rates ◽  
Parana River ◽  
River Flood ◽  
The Right

This paper intend to contribute on understanding of small part of tropical/subtropical large river fluvial geomorphology: the high Paraná river flood system. The studied area is inserted in Baía River Compartment, characterized of large alluvial plain, in the right margin of high Paraná River, and the greater archipelagoes subdividing the channel in branches with different importance. The intensity of erosive process on the Paraná River banks were studied in four different kinds of channel by 29 points, during a hydrodynamic cycle. The obtained data was still treated with cluster analysis and the correlation through the linear and exponential regression among variables. Results evidenced that the flow velocity and mechanical composition of banks were the main variables of bank erosion rates, and that the another variables, like roots and vegetation, do not had any influence to control the bank erosion. Erosion, accretion and by pass are processes controlled by the Paraná river regime, by shifting of the talweg position and then also controlled by intensity, duration and recurrence of flood.

scholarly journals Response of lateral channel dynamics of a lowland meandering river to engineering-derived adjustments - an example of the Morava River (Czech Republic)

2015 ◽  
Vol 7 (1) ◽  
Author(s):  
Jakub Ondruch ◽  
Zdenek Mácka
Keyword(s):  
Czech Republic ◽  
Temporal Dynamics ◽  
Bank Erosion ◽  
River Regulation ◽  
Aerial Photographs ◽  
Radius Of Curvature ◽  
Regulated Rivers ◽  
River Bank ◽  
Erosion Rates ◽  
Morava River

AbstractFreely meandering (quasi)natural reaches of lowland rivers represent a rare phenomenon in Central Europe. Increasing attention is currently being paid to the dynamics of quasi-natural (artificially influenced) meandering rivers as this attention represents the basic prerequisite for the development of appropriate restoration strategies on regulated rivers. This study focused on a 5.5 km long reach of the Morava River in the Strážnické Pomoraví region, Czech Republic that is characterised by quasi-natural evolution after substantial engineering adjustments were made in the first decades of the twentieth century. Based on Geographic Information Systems (GIS) analysis of aerial photographs, the spatio-temporal dynamics of bank erosion and accretion rates were quantitatively described and variables that control channel migration rates were identified. High rates of lateral shifts were localised in high sinuosity segments (sinuosity 1.17-2.37), whereas segments with very low rates were straight or formed into slightly curved bends (sinuosity 1.05-1.18). As a key factor, engineering works that influenced local river bed slope and induced a dramatic increase in bank erosion rates were identified. River engineering works induced a dramatic increase in bank erosion rate (2.19 m/year for 1938-53 and 1.47 m/year for 1953-63). An interval of approximately 25 years was needed before the erosion rates dropped back to values documented before river regulation (0.35-1.09 m/year for 1841-1938). Other important controlling variables included radius of curvature, frequency and magnitude of floods and, locally, river bank material properties and floodplain land cover.

Downstream change in river bank erosion rates in the Swale-Ouse system, northern England

1999 ◽  
Vol 13 (7) ◽  
pp. 977-992 ◽  
Author(s):  
D. M. Lawler ◽  
J. R. Grove ◽  
J. S. Couperthwaite ◽  
G. J. L. Leeks
Keyword(s):  
Bank Erosion ◽  
River Bank ◽  
Erosion Rates ◽  
River Bank Erosion

scholarly journals Is the BEHI Index (Part of the BANCS Model) Good for Prediction of Streambank Erosion?

2016 ◽  
Vol 64 (4) ◽  
pp. 1107-1114 ◽  
Author(s):  
Zuzana Allmanová ◽  
Matúš Jakubis
Keyword(s):  
Flash Flood ◽  
Hazard Index ◽  
Bank Erosion ◽  
Strong Relationship ◽  
Streambank Erosion ◽  
Erosion Rates ◽  
Stream Bank Erosion ◽  
Stream Bank ◽  
High Precipitation ◽  
In The Beginning

Sedimentation of waterways and reservoirs, decreasing quality of drinking water and costs necessary for maintenance of these objects directly related to streambank erosion. This study provides a tool for water management that can help with estimation parts of a streambank which are prone to erosion. The Bank erosion hazard index (BEHI) part of the BANCS (Bank Assessment for Non‑point source Consequences of Sediment) model is one of the several procedures for assessing streambank erosion condition and potential (Rosgen, 2001). On May 15th 2014 a high precipitation occurred in the watershed of Sestrč torrent, in the eastern part of Chočské vrchy (Sp = 27.64 km2). It reached 102.7 mm per 24 hours. The rainfall resulted in extreme streambank erosion. We started the research of annual stream bank erosion on Sestrč in the beginning of May 2014 and we established 19 experimental sections on the stream. Occurrence of heavy rainfall allowed us to erosion rates after flash flood. The aim of this paper was to verify, if BEHI index can really determine the most vulnerable parts of a banks to erosion. We measured erosion rates Eb (m3/m) using a bank pins and toe pin (Sass, 2011) on each experimental section and evaluated each section by BEHI index (Rosgen, 2001, 2008). The results were statistically verified and confirmed a strong relationship between BEHI and real damage of banks Eb (m3/m) (R: 0.88, R2: 0.78).

scholarly journals Measurement of Riverbank Erosion Rates of Pusu River Using Erosion Pins Method

2021 ◽  
Vol 13 (3) ◽  
Author(s):  
Nur Aqilah Mohd Rosli ◽  
◽  
Saerahany Legori Ibrahim ◽  
Rabitah Handan ◽  
Md Noor Salleh ◽  
...  
Keyword(s):  
Bank Erosion ◽  
High Flow ◽  
Bank Failure ◽  
Heavy Rainfall Event ◽  
Vegetative Cover ◽  
Grid Pattern ◽  
Erosion Rates ◽  
Erosion Pins ◽  
Riverbank Erosion ◽  
Measurement Period

Riverbank erosion is a major concern in all parts of the world due to its extensive impacts geomorphologically and economically. This study aims to quantify the rates of riverbank erosion of Pusu River using erosion pins method. Two sections of the river were selected namely site A and site B where site A is a straight section while site B is situated on the outside bend. 21 pins were installed at each site in a grid pattern. Measurement of erosion pins exposure were taken from February 2019 to April 2019. Field observation were made to identify the possible factors influencing the bank erosion. The average rates of bank erosion ranged between 0.05 cm/day to 0.21 cm/day at site A and 0.09 cm/day to 0.51 cm/day at site B. Bank failure occurred at site B towards the end of measurement period due to high flow after heavy rainfall event. Field observations suggest that rates of riverbank erosion were influenced by several factors such as the flow velocity and vegetative cover of the bank.

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