scholarly journals Floating Architecture: A Design on Hydrophilic Floating House for Fluctuating Water Level

2015 ◽  
Vol 8 (32) ◽  
Author(s):  
A. Ambica ◽  
K. Venkatraman
Keyword(s):  
Water Level ◽  
Fluctuating Water Level

scholarly journals On a predator-prey system interaction under fluctuating water level with nonselective harvesting

2020 ◽  
Vol 18 (1) ◽  
pp. 458-475
Author(s):  
Na Zhang ◽  
Yonggui Kao ◽  
Fengde Chen ◽  
Binfeng Xie ◽  
Shiyu Li
Keyword(s):  
Water Level ◽  
Equilibrium Points ◽  
Sufficient Conditions ◽  
Optimal Harvesting ◽  
Positive Equilibrium ◽  
Predator Population ◽  
Model Interaction ◽  
Predator Prey ◽  
Predator Prey Model ◽  
Fluctuating Water Level

Abstract A predator-prey model interaction under fluctuating water level with non-selective harvesting is proposed and studied in this paper. Sufficient conditions for the permanence of two populations and the extinction of predator population are provided. The non-negative equilibrium points are given, and their stability is studied by using the Jacobian matrix. By constructing a suitable Lyapunov function, sufficient conditions that ensure the global stability of the positive equilibrium are obtained. The bionomic equilibrium and the optimal harvesting policy are also presented. Numerical simulations are carried out to show the feasibility of the main results.

The biology of Butomus umbellatus in shallow waters with fluctuating water level

1996 ◽  
pp. 27-30 ◽  
Author(s):  
Zdenka Hroudová ◽  
Anna Krahulcová ◽  
Petr Zákravský ◽  
Vlasta Jarolímová
Keyword(s):  
Water Level ◽  
Shallow Waters ◽  
Fluctuating Water Level

The life histories of Limnephilus externus Hagen, Anabolia bimaculata (Walker), and Nemotaulius hostilis (Hagen) (Trichoptera, Limnephilidae) in a pond in southern Alberta, Canada

1986 ◽  
Vol 64 (10) ◽  
pp. 2348-2356 ◽  
Author(s):  
Stephen B. Berté ◽  
Gordon Pritchard
Keyword(s):  
Water Level ◽  
Life Histories ◽  
Larval Growth ◽  
Metabolic Cost ◽  
Late Summer ◽  
Adult Emergence ◽  
High Water ◽  
Reproductive Diapause ◽  
Fluctuating Water Level ◽  
The Masses

Limnephilus externus and Anabolia bimaculata are caddisflies that typically inhabit temporary pools, while Nemotaulius hostilis is a species that inhabits permanent pools. In a permanent pond with a fluctuating water level, both groups could be accommodated. The temporary-pool species laid egg masses on the ground above the water level in late summer. Larvae hatched in the autumn but remained in the masses until submersed by the rising water in the spring. Larvae grew at rates faster than those for any permanent-water trichopteran studied to date. Limnephilus externus adults emerged through August and underwent a 1-month reproductive delay. Anabolia bimaculata adults emerged through July, but showed no signs of a reproductive delay. By contrast, N. hostilis oviposited on riparian vegetation and larvae entered the water on hatching in August. Larval growth rates approximated those of other detritivorous shredders found in permanent waters. Over 75% of adult emergence occurred in 1 week at the end of May and adults underwent a reproductive diapause of slightly over a month's duration. The metabolic cost of high water temperatures on cool-adapted limnephilid caddisflies is postulated as the driving force behind the evolution of reproductive diapause in this family.

scholarly journals Lake Chad: Fluctuating Water Level and Its Implications for People’s Livelihood in the Area

2021 ◽  
Vol 9 (2) ◽  
pp. 1-8
Author(s):  
Asiru Monday Abbas ◽  
Unekwu Hadiza Amanabo
Keyword(s):  
Water Level ◽  
Protected Area ◽  
Agricultural Practices ◽  
Food Aid ◽  
Agricultural Activities ◽  
Negative Effects ◽  
Environmental Sciences ◽  
Boko Haram ◽  
Lake Chad ◽  
Fluctuating Water Level

This study assessed the fluctuating water level of Lake Chad and its consequences on the livelihood of people that depend on it. In terms of depth, Lake Chad is very shallow which makes it vulnerable to climate change and human activities. The study opined that continuous reduction in the volume of water of the lake will lead to negative effects such as forceful migration, resource-induced conflict, loss of biodiversity etc. Insurgency spear-headed by Nigeria based terrorist organization, “Boko Haram”, has killed many people including farmers and fishermen in the riparian countries of Nigeria, Niger, Chad and Cameroun and this has led to a decline in agricultural activities around the Lake Chad area making many to depend on food aid for their survival. The insurrectional activity of the terrorist group around the Lake Chad area also makes trade between communities extremely difficult as they are known to have attacked and killed people inside market. It is recommended that measures such as livelihood diversification through technology, creation of protected area, improved agricultural practices etc. should be adopted to reduce pressure on the lake and its resources. The Dhaka University Journal of Earth and Environmental Sciences, Vol. 9(2), 2020, P 1-8

Classification of water regimes in systems of fluctuating water level

1994 ◽  
Vol 45 (8) ◽  
pp. 1375 ◽  
Author(s):  
MD Brownlow ◽  
AD Sparrow ◽  
GG Ganf
Keyword(s):  
Water Level ◽  
Water Depth ◽  
Aquatic Macrophyte ◽  
South Australia ◽  
High Water ◽  
Water Regimes ◽  
Level Data ◽  
Regime Types ◽  
Depth Gradients ◽  
Fluctuating Water Level

Aquatic macrophyte communities have been shown to form sequences along water depth gradients, and water depth has been related to various types of environmental stresses. However, in semi-permanent wetlands, water depth is rarely constant through time; there are large fluctuations in water level between seasons and years, and the relative lengths of wet and dry periods may be as important a stress as the average (or maximum) depth of water. This paper presents a method of quantifying water regimes on the basis of infrequently sampled water level data and of comparing and defining regime-types within and between semi-permanent swamps. Time periods per depth class are calculated from water depth data for each gradient position from the bottom of the swamp to the high-water mark. These data can be represented as a histogram that describes the wetldry pattern of each gradient position. A multivariate clustering is used to compare gradient positions in different swamps on the basis of depth and period of inundation. Water regime types are then defined on the basis of the groups derived in the clustering. The method is illustrated for the Bool Lagoon system in the south-east of South Australia.

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