scholarly journals Influence of water level management on vegetation and bird use of restored wetlands in the Montezuma Wetlands Complex

2021 ◽  
Author(s):  
Edward B. Farley ◽  
Michael L. Schummer ◽  
Donald J. Leopold ◽  
John M. Coluccy ◽  
Douglas C. Tozer
Keyword(s):  
Water Level ◽  
Restored Wetlands ◽  
Influence Of Water ◽  
Water Level Management

Ecosystem development in Lake Volkerak-Zoom: concept and strategy

1995 ◽  
Vol 31 (8) ◽  
pp. 239-243 ◽  
Author(s):  
W. Ligtvoet ◽  
S. A. de Jong
Keyword(s):  
Water Level ◽  
Fish Stock ◽  
Ecosystem Development ◽  
Optimal Conditions ◽  
Stock Management ◽  
Key Factors ◽  
Integrated Water Management ◽  
Ecological Concepts ◽  
Freshwater System ◽  
Water Level Management

In the 6000 ha Lake Volkerak-Zoom, a new freshwater system in the estuarine southwest of The Netherlands, biomanipulation is used as a tool in ecosystem development. The basic ecological concepts for ecosystem development are described. Key factors in the integrated water management are fish stock management and water level management, geared towards creating optimal conditions for northern pike, the dominant predator in mesotrophic waters. The main aspects of the water level management and the fish stock management are outlined.

Untersuchungen zum Einfluss von Stauspiegelschwankungen auf das Verhalten einer langsamen Massenbewegung/Investigations on the influence of water level changes on the behaviour of a slow moving landslide

Bauingenieur ◽  
2017 ◽  
Vol 92 (09) ◽  
pp. 377-386 ◽  
Author(s):  
Roman Marte ◽  
Helmut F. Schweiger ◽  
Georg M. Ausweger
Keyword(s):  
Water Level ◽  
Water Level Changes ◽  
Influence Of Water ◽  
Slow Moving

Langsame Massenbewegungen stellen eine potenzielle Gefährdung für die Umgebung dar, wenn es aufgrund äußerer Einflüsse zu einem plötzlichen Versagen oder stark zunehmenden Bewegungsraten kommen kann. In diesem Beitrag wird der Einfluss von Stauspiegelschwankungen in einem Speicherbecken auf das Bewegungsverhalten einer langsamen Massenbewegung untersucht. Hierfür werden einerseits die Ergebnisse der messtechnischen Überwachung und andererseits umfangreiche numerische Untersuchungen herangezogen. Im Zuge der numerischen Untersuchungen wird anhand einer Vorstudie der Einfluss von Wasserspiegelschwankungen auf die Porenwasserdrücke im Untergrund untersucht. Dabei wird auch ein quasigesättigter Zustand des Untergrunds mitberücksichtigt. Anschließend werden die dabei gesammelten Erkenntnisse auf ein 2D-Modell angewendet. Ein Vergleich der Berechnungs- und Messergebnisse führt zu einem besseren Verständnis des Verhaltens der Massenbewegung und in weiterer Folge ermöglicht die numerische Untersuchung eine Abschätzung des Einflusses der Wasserspiegelschwankungen auf die Standsicherheit der Massenbewegung. Die durchgeführten Untersuchungen dienen als Grundlage für die Ausarbeitung von Stabilisierungsmaßnahmen.

scholarly journals Influence of water level fluctuation on the mortality and aboveground biomass of the aquatic macrophyte Eleocharis interstincta (VAHL) roemer et schults

2004 ◽  
Vol 47 (2) ◽  
pp. 281-290 ◽  
Author(s):  
Anderson Medeiros dos Santos ◽  
Francisco de Assis Esteves
Keyword(s):  
Water Level ◽  
Aboveground Biomass ◽  
Aquatic Macrophyte ◽  
Sampling Period ◽  
Water Level Fluctuations ◽  
Northern Coast ◽  
Significant Difference ◽  
Influence Of Water ◽  
Response To Water

The goal of this study was to study the biometric alterations of Eleocharis interstincta in response to water level fluctuations in Cabiúnas Lagoon, located on the northern coast of the state of Rio de Janeiro, in the municipality of Macaé. Three quadrats of 0.0625 m² were harvested every two weeks from June/1997 to June/1998; samples were separated into stems, dead stems (detritus) and rhizome; lenghted, dried and weighted. The water level fluctuated seasonally in the macrophyte stand with two periods of drawdown. The first period occurred naturally at the end of winter and beginning of spring, when rainfall in the area was normally lowest. The second period of drawdown was the result of an artificial breaching of the sandbar that isolate the lagoon from the sea. The breach was made in the summer, at the time of highest rainfall, when the water level in the lagoon reached the maximum value recorded during the study (1.35 m). There was a strongly positive correlation of the water level with stems mean height and aboveground biomass, indicating that water level played an important role in the determination of these parameters. There was a significant difference between stem height (ANOVA; p < 0.001) and biomass (ANOVA; p < 0.001) in each sampling period, ranging from 143.9 cm and 338.8 g dry wt.m-2, before the sandbar opening, to 16.3 cm and 20.2 g dry wt.m-2 respectively after the sandbar breaching. The drastic variation of the water level, leading mass mortality of the stems, together with the lowest mean biomass/stem (0.057 g dry wt.individual-1), recorded after the sandbar breaching, did not represent a strong disturbance for E. interstincta, since the resilience time estimated for this population was about 30 days.

Groundwater-surface water relations in regulated lowland catchments; hydrological and hydrochemical effects of a major change in surface water level management

2019 ◽  
Vol 660 ◽  
pp. 1317-1326 ◽  
Author(s):  
Joachim Rozemeijer ◽  
Janneke Klein ◽  
Dimmie Hendriks ◽  
Wiebe Borren ◽  
Maarten Ouboter ◽  
...  
Keyword(s):  
Surface Water ◽  
Water Level ◽  
Water Relations ◽  
Major Change ◽  
Water Level Management
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