scholarly journals Long-term and extreme water level variations of the shallow Lake Poopó, Bolivia

2006 ◽  
Vol 51 (1) ◽  
pp. 98-114 ◽  
Author(s):  
RAMIRO PILLCO ZOLÁ ◽  
LARS BENGTSSON
Keyword(s):  
Water Level ◽  
Shallow Lake ◽  
Extreme Water Level ◽  
Water Level Variations

How long-term water level changes influence the spatial distribution of fish and other functional groups in a large shallow lake

2020 ◽  
Vol 46 (4) ◽  
pp. 813-823 ◽  
Author(s):  
Upendra Bhele ◽  
Burak Öğlü ◽  
Arvo Tuvikene ◽  
Priit Bernotas ◽  
Maidu Silm ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Water Level ◽  
Functional Groups ◽  
Shallow Lake ◽  
Large Shallow Lake ◽  
Water Level Changes ◽  
Distribution Of Fish

scholarly journals Analysis of Long-Term Water Level Variations in Qinghai Lake in China

Water ◽  
2019 ◽  
Vol 11 (10) ◽  
pp. 2136 ◽  
Author(s):  
Fang ◽  
Li ◽  
Rubinato ◽  
Ma ◽  
Zhou ◽  
...  
Keyword(s):  
Climate Change ◽  
Tibetan Plateau ◽  
Water Level ◽  
Water Levels ◽  
Qinghai Lake ◽  
The Tibetan Plateau ◽  
Climate Change Effects ◽  
Water Level Variations ◽  
Respective Contribution

Qinghai Lake is the largest inland saline lake on the Tibetan Plateau. Climate change and catchment modifications induced by human activities are the main drivers playing a significant role in the dramatic variation of water levels in the lake (Δh); hence, it is crucial to provide a better understanding of the impacts caused by these phenomena. However, their respective contribution to and influence on water level variations in Qinghai Lake are still unclear and without characterizing them, targeted measures for a more efficient conservation and management of the lake cannot be implemented. In this paper, data monitored during the period 1960–2016 (e.g., meteorological and land use data) have been analyzed by applying multiple techniques to fill this gap and estimate the contribution of each parameter recorded to water level variations (Δh). Results obtained have demonstrated that the water level of Qinghai Lake declined between 1960 and 2004, and since then has risen continuously and gradually, due to the changes in evaporation rates, precipitation and consequently surface runoff associated with climate change effects and catchment modifications. The authors have also pinpointed that climate change is the main leading cause impacting the water level in Qinghai Lake because results demonstrated that 93.13% of water level variations can be attributable to it, while the catchment modifications are responsible for 6.87%. This is a very important outcome in the view of the fact that global warming clearly had a profound impact in this sensitive and responsive region, affecting hydrological processes in the largest inland lake of the Tibetan Plateau.

scholarly journals The Physics of Long Term Drawdowns in Pumping from Artesian Aquifers

1978 ◽  
Vol 9 (5) ◽  
pp. 249-262 ◽  
Author(s):  
Henrik Kærgaard
Keyword(s):  
Mathematical Models ◽  
Water Level ◽  
Theoretical Discussion ◽  
Water Level Variations ◽  
Good Agreement

The applicability of the Theis-formula (1935) and the Jacob-Hantush leakage-formula (1946 and 1956) as tools for the description of water-level variations due to pumping from artesian aquifers, is shown to be rather limited, especially in long term pumping situations. The limitations are discussed and illustrated through a review of some mathematical models with more reliable and physical realistic preconditions, and a general perception of the physics governing the drawdowns in pumping from leaky artesian aquifers is hereby established. Data from 10 years of heavy pumping from a leaky artesian multi-aquifer at Egebjerg near Horsens, Denmark, are analysed, and the result turns out to be in good agreement with the theoretical discussion.

Multivariate analysis of long term water quality changes of shallow Lake Balaton

2006 ◽  
Vol 29 (4) ◽  
pp. 2051-2055 ◽  
Author(s):  
G. Kiss ◽  
Gy. Dévai ◽  
B. Tóthmérész ◽  
A. Szabó
Keyword(s):  
Water Quality ◽  
Multivariate Analysis ◽  
Shallow Lake ◽  
Lake Balaton ◽  
Quality Changes

scholarly journals Assessing Stream-Aquifer Connectivity in a Coastal California Watershed

Water ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 416
Author(s):  
Bwalya Malama ◽  
Devin Pritchard-Peterson ◽  
John J. Jasbinsek ◽  
Christopher Surfleet
Keyword(s):  
Time Series ◽  
Spectral Analysis ◽  
Water Level ◽  
Time Series Data ◽  
Series Data ◽  
Low Permeability ◽  
Pumping Tests ◽  
Stream Flows ◽  
The Impact

We report the results of field and laboratory investigations of stream-aquifer interactions in a watershed along the California coast to assess the impact of groundwater pumping for irrigation on stream flows. The methods used include subsurface sediment sampling using direct-push drilling, laboratory permeability and particle size analyses of sediment, piezometer installation and instrumentation, stream discharge and stage monitoring, pumping tests for aquifer characterization, resistivity surveys, and long-term passive monitoring of stream stage and groundwater levels. Spectral analysis of long-term water level data was used to assess correlation between stream and groundwater level time series data. The investigations revealed the presence of a thin low permeability silt-clay aquitard unit between the main aquifer and the stream. This suggested a three layer conceptual model of the subsurface comprising unconfined and confined aquifers separated by an aquitard layer. This was broadly confirmed by resistivity surveys and pumping tests, the latter of which indicated the occurrence of leakage across the aquitard. The aquitard was determined to be 2–3 orders of magnitude less permeable than the aquifer, which is indicative of weak stream-aquifer connectivity and was confirmed by spectral analysis of stream-aquifer water level time series. The results illustrate the importance of site-specific investigations and suggest that even in systems where the stream is not in direct hydraulic contact with the producing aquifer, long-term stream depletion can occur due to leakage across low permeability units. This has implications for management of stream flows, groundwater abstraction, and water resources management during prolonged periods of drought.

Extreme Water Level Simulation and Component Analysis in Delaware Estuary during Hurricane Isabel

2021 ◽  
Author(s):  
Dongxiao Yin ◽  
David F. Muñoz ◽  
Roham Bakhtyar ◽  
Z. George Xue ◽  
Hamed Moftakhari ◽  
...  
Keyword(s):  
Water Level ◽  
Component Analysis ◽  
Delaware Estuary ◽  
Extreme Water Level ◽  
Hurricane Isabel
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