Dynamical effects of retention structures on the mitigation of lake eutrophication

2019 ◽  
Vol 119 ◽  
pp. 309-326 ◽  
Author(s):  
A. Caen ◽  
D. Latour ◽  
J.D. Mathias
Keyword(s):  
Lake Eutrophication ◽  
Retention Structures

Groins, sand retention, and the future of Southern California’s beaches

Shore & Beach ◽  
2020 ◽  
pp. 14-36
Author(s):  
Gary Griggs ◽  
Kiki Patsch ◽  
Charles Lester ◽  
Ryan Anderson
Keyword(s):  
Sea Level Rise ◽  
Sea Level ◽  
Southern California ◽  
Beach Sand ◽  
Submarine Canyons ◽  
Littoral Drift ◽  
Short Supply ◽  
Land Use Decisions ◽  
Coastal Cliffs ◽  
Retention Structures

Beaches form a significant component of the economy, history, and culture of southern California. Yet both the construction of dams and debris basins in coastal watersheds and the armoring of eroding coastal cliffs and bluffs have reduced sand supply. Ultimately, most of this beach sand is permanently lost to the submarine canyons that intercept littoral drift moving along this intensively used shoreline. Each decade the volume of lost sand is enough to build a beach 100 feet wide, 10 feet deep and 20 miles long, or a continuous beach extending from Newport Bay to San Clemente. Sea-level rise will negatively impact the beaches of southern California further, specifically those with back beach barriers such as seawalls, revetments, homes, businesses, highways, or railroads. Over 75% of the beaches in southern California are retained by structures, whether natural or artificial, and groin fields built decades ago have been important for local beach growth and stabilization efforts. While groins have been generally discouraged in recent decades in California, and there are important engineering and environmental considerations involved prior to any groin construction, the potential benefits are quite large for the intensively used beaches and growing population of southern California, particularly in light of predicted sea-level rise and public beach loss. All things considered, in many areas groins or groin fields may well meet the objectives of the California Coastal Act, which governs coastal land-use decisions. There are a number of shoreline areas in southern California where sand is in short supply, beaches are narrow, beach usage is high, and where sand retention structures could be used to widen or stabilize local beaches before sand is funneled offshore by submarine canyons intercepting littoral drift. Stabilizing and widening the beaches would add valuable recreational area, support beach ecology, provide a buffer for back beach infrastructure or development, and slow the impacts of a rising sea level.

scholarly journals Seasonal Succession of Bacterial Communities in Three Eutrophic Freshwater Lakes

2021 ◽  
Vol 18 (13) ◽  
pp. 6950
Author(s):  
Bin Ji ◽  
Cheng Liu ◽  
Jiechao Liang ◽  
Jian Wang
Keyword(s):  
Water Quality ◽  
Surface Water ◽  
Water Temperature ◽  
Bacterial Communities ◽  
Seasonal Succession ◽  
Lake Eutrophication ◽  
Urban Lake ◽  
Freshwater Lakes ◽  
Functional Prediction ◽  
Bacterial Indicator

Urban freshwater lakes play an indispensable role in maintaining the urban environment and are suffering great threats of eutrophication. Until now, little has been known about the seasonal bacterial communities of the surface water of adjacent freshwater urban lakes. This study reported the bacterial communities of three adjacent freshwater lakes (i.e., Tangxun Lake, Yezhi Lake and Nan Lake) during the alternation of seasons. Nan Lake had the best water quality among the three lakes as reflected by the bacterial eutrophic index (BEI), bacterial indicator (Luteolibacter) and functional prediction analysis. It was found that Alphaproteobacteria had the lowest abundance in summer and the highest abundance in winter. Bacteroidetes had the lowest abundance in winter, while Planctomycetes had the highest abundance in summer. N/P ratio appeared to have some relationships with eutrophication. Tangxun Lake and Nan Lake with higher average N/P ratios (e.g., N/P = 20) tended to have a higher BEI in summer at a water temperature of 27 °C, while Yezhi Lake with a relatively lower average N/P ratio (e.g., N/P = 14) tended to have a higher BEI in spring and autumn at a water temperature of 9–20 °C. BEI and water temperature were identified as the key parameters in determining the bacterial communities of lake water. Phosphorus seemed to have slightly more impact on the bacterial communities than nitrogen. It is expected that this study will help to gain more knowledge on urban lake eutrophication.

Development of a Lake Eutrophication model

2004 ◽  
Vol 171 (1-2) ◽  
pp. 35-63 ◽  
Author(s):  
J.M. Malmaeus ◽  
L. Håkanson
Keyword(s):  
Lake Eutrophication

Modelling and Control of Lake Eutrophication

1975 ◽  
Vol 8 (1) ◽  
pp. 478-487 ◽  
Author(s):  
D.M. Imboden ◽  
R. Gächter
Keyword(s):  
Lake Eutrophication ◽  
And Control

Legacy of early anthropogenic effects on recent lake eutrophication (Lake Bénit, northern French Alps)

Anthropocene ◽  
2018 ◽  
Vol 24 ◽  
pp. 72-87 ◽  
Author(s):  
Manon Bajard ◽  
David Etienne ◽  
Sébastien Quinsac ◽  
Etienne Dambrine ◽  
Pierre Sabatier ◽  
...  
Keyword(s):  
Anthropogenic Effects ◽  
Lake Eutrophication ◽  
French Alps

scholarly journals Effect of small water retention structures on diffusive CO2 and CH4 emissions along a highly impounded river

Inland Waters ◽  
2018 ◽  
Vol 8 (4) ◽  
pp. 449-460 ◽  
Author(s):  
Lluís Gómez-Gener ◽  
Marina Gubau ◽  
Daniel von Schiller ◽  
Rafael Marcé ◽  
Biel Obrador
Keyword(s):  
Water Retention ◽  
Ch4 Emissions ◽  
Small Water ◽  
Retention Structures
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