A strategy for fine sediment retention with bioengineering works in eroded marly catchments in a mountainous mediterranean climate (Southern ALPS, France)

2009 ◽  
Vol 20 (2) ◽  
pp. 210-216 ◽  
Author(s):  
F. Rey
Keyword(s):  
Mediterranean Climate ◽  
Fine Sediment ◽  
Southern Alps ◽  
Sediment Retention

Fine sediment retention in storage chambers: an assessment of time-dependent effects

2002 ◽  
Vol 45 (7) ◽  
pp. 123-131 ◽  
Author(s):  
V.R. Stovin ◽  
J.P. Grimm ◽  
A.J. Saul
Keyword(s):  
Fine Sediment ◽  
Multiphase Model ◽  
Storm Events ◽  
Dimensional Model ◽  
Flow Conditions ◽  
Sediment Retention ◽  
Fine Sediments ◽  
Storage Chamber ◽  
Flow Hydraulics ◽  
The Uk

The optimisation of the design of a storage chamber is generally based upon some measure of the chamber's sedimentation efficiency. In the UK, chambers that minimise the deposition of fine sediments are preferred. Previous laboratory and CFD-based studies to measure efficiency have focused on steady flow conditions. However, both the flow hydraulics within a storage chamber and the pollutant loading in the incoming sewage vary markedly during storm events. This paper outlines a CFD-based approach for determining “overall” chamber efficiency. The approach employs an unsteady volume-of-fluid multiphase model and stochastic particle tracking. Preliminary results from a simplified two-dimensional model are presented.

Evaluation of the effect of porous check dam location on fine sediment retention (a case study)

2008 ◽  
Vol 152 (1-4) ◽  
pp. 319-326 ◽  
Author(s):  
A. M. Hassanli ◽  
A. Esmaeli Nameghi ◽  
S. Beecham
Keyword(s):  
Fine Sediment ◽  
Check Dam ◽  
Sediment Retention

scholarly journals Mud in sandy riverbed deposits as a proxy for ancient fine-sediment supply

Geology ◽  
2021 ◽  
Author(s):  
N. Wysocki ◽  
E. Hajek
Keyword(s):  
Fine Sediment ◽  
Sediment Supply ◽  
Primary Control ◽  
Flow Conditions ◽  
Sediment Retention ◽  
Channel Networks ◽  
High Discharge ◽  
River Deposits ◽  
Series Of Experiments ◽  
Bed Material

The amount of silt and clay available to rivers reflects source-terrain composition and weathering and can be a primary control on the form and dynamics of channel networks. Fine sediment also affects the permeability of buried fluvial reservoirs. Despite this significance, there is currently a lack of methods for reconstructing how much fine sediment was transported by ancient rivers. Mud accumulations in sandy river deposits are often interpreted as indicators of variable flow conditions; however, these deposits may present an opportunity to constrain how much fine sediment was transported through ancient rivers. We report results from a series of experiments designed to evaluate how much clay and silt are preserved in sandy riverbed deposits under constant and variable discharge conditions. Our results demonstrate that (1) mud deposits, including drapes and lenses, form readily under constant, high-discharge conditions, (2) the amount of fine sediment recovered from bed-material deposits increases as fine-sediment supply increases, and (3) fine-sediment retention is higher during bed aggradation than during bypass conditions. These results indicate that the net retention of clay and silt in sandy riverbed deposits may be a simple but powerful proxy for comparing the overall amount of fine sediment supplied to ancient rivers.

THE CLASSIFICATION OF LAND ACCORDING TO THE DEGREE OF RABBIT INFESTATION IN CENTRAL OTAGO

1987 ◽  
pp. 65-70
Author(s):  
I.G.C. Kerr ◽  
J.M. Williams ◽  
W.D. Ross ◽  
J.M. Pollard
Keyword(s):  
Carrying Capacity ◽  
Mediterranean Climate ◽  
Natural Habitat ◽  
Public Funding ◽  
Soil Survey ◽  
European Rabbit ◽  
Cultural Modification ◽  
Classification Information ◽  
Semi Arid

The European rabbit (Oryctolagus cuniculus) introduced into New Zealand in the 183Os, has consistently flourished in Central Otago, the upper Waitaki, and inland Marlborough, all areas of mediterranean climate. It has proved difficult to manage in these habitats. The 'rabbit problem' is largely confined to 105,000 ha of low producing land mostly in semi arid areas of Central Otago. No field scale modifications of the natural habitat have been successful in limiting rabbit numbers. The costs of control exceed the revenue from the land and continued public funding for control operations appears necessary. A system for classifying land according to the degree of rabbit proneness is described. Soil survey and land classification information for Central Otago is related to the distribution and density of rabbits. This intormation can be used as a basis for defining rabbit carrying capacity and consequent land use constraints and management needs. It is concluded that the natural rabbit carrying capacity of land can be defined by reference to soil survey information and cultural modification to the natural vegetation. Classification of land according to rabbit proneness is proposed as a means of identifying the need for, and allocation of, public funding tor rabbit management. Keywords: Rabbit habitat, rabbit proneness, use of rabbit prone land.

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