scholarly journals Characteristics of water level fluctuations in Polish lakes – a review of the literature / Charakterystyka wahań poziomu wody w jeziorach polskich – przegląd piśmiennictwa

2014 ◽  
Vol 25 (3) ◽  
pp. 27-34 ◽  
Author(s):  
Sebastian Kutyła
Keyword(s):  
Water Level ◽  
Ecological Status ◽  
Hydrological Regime ◽  
Biological Indicators ◽  
Water Level Fluctuations ◽  
Review Of Literature ◽  
Economic Activities ◽  
Natural Feature ◽  
Good Ecological Status ◽  
The Impact

Abstract Water level fluctuations (WLF) in lakes are a natural feature that can be modified by human activities. The article presents a review of literature on the water level fluctuation in Polish lakes, their amplitude, periodicity and trends. WLF controlled by natural conditions and also those induced by human activity were considered. Although anthropogenic water level fluctuations in most Polish lakes seem to fall within the range of natural fluctuations, in some cases economic activities (e.g. the use of lakes for energy generation purposes) can lead to strong disturbances of the hydrological regime, causing an ecological instability that makes it impossible to maintain/achieve good ecological status. This, in turn, makes it necessary to define good ecological potential, being an environmental objective for such water bodies, which is less rigorous compared with good ecological status. The article indicates the need to expand the methods for the assessment of lakes in the country with new biological indicators to assess, in accordance with the Water Framework Directive requirements, the impact of hydrological alterations on biota

Quantifying recent lake level changes in Patagonia (Argentina and Chile): Back to the future?

2021 ◽  
Author(s):  
Daniel Ariztegui ◽  
Clément Pollier ◽  
Andrés Bilmes
Keyword(s):  
Water Level ◽  
Lake Level ◽  
Satellite Images ◽  
Meteorological Data ◽  
Tierra Del Fuego ◽  
Water Level Fluctuations ◽  
Lake Levels ◽  
The Past ◽  
Rainfall Variations ◽  
The Impact

<p>Lake levels in hydrologically closed-basins are very sensitive to climatically and/or anthropogenically triggered environmental changes. Their record through time can provide valuable information to forecast changes that can have substantial economical and societal impact.</p><p>Increasing precipitation in eastern Patagonia (Argentina) have been documented following years with strong El Niño (cold) events using historical and meteorological data. Quantifying changes in modern lake levels allow determining the impact of rainfall variations while contributing to anticipate the evolution of lacustrine systems over the next decades with expected fluctuations in ENSO frequencies. Laguna Carrilaufquen Grande is located in the intermontane Maquinchao Basin, Argentina. Its dimension fluctuates greatly, from 20 to 55 km<sup>2</sup> water surface area and an average water depth of 3 m. Several well-preserved gravelly beach ridges witness rainfall variations that can be compared to meteorological data and satellite images covering the last ~50 years. Our results show that in 2016 lake level was the lowest of the past 44 years whereas the maximum lake level was recorded in 1985 (+11.8 m above the current lake level) in a position 1.6 km to the east of the present shoreline. A five-years moving average rainfall record of the area was calculated smoothing the extreme annual events and correlated to the determined lake level fluctuations. The annual variation of lake levels was up to 1.2 m (e.g. 2014) whereas decadal variations related to humid-arid periods for the interval 2002 to 2016 were up to 9.4 m. These data are consistent with those from other monitored lakes and, thus, our approach opens up new perspectives to understand the historical water level fluctuations of lakes with non-available monitoring data.</p><p> </p><p>Laguna de los Cisnes in the Chilean section of the island of Tierra del Fuego, is a closed-lake presently divided into two sections of 2.2 and 11.9 km<sup>2</sup>, respectively. These two water bodies were united in the past forming a single larger lake. The lake level was  ca. 4 m higher than today as shown by clear shorelines and the outcropping of large Ca-rich microbialites. Historical data, aerial photographs and satellite images indicate that the most recent changes in lake level are the result of a massive decrease of water input during the last half of the 20<sup>th</sup> century triggered by an indiscriminate use of the incoming water for agricultural purposes. The spectacular outcropping of living and fossil microbialites is not only interesting from a scientific point of view but has also initiated the development of the site as a local touristic attraction. However, if the use of the incoming water for agriculture in the catchment remains unregulated the lake water level might drop dangerously and eventually the lake might fully desiccate.</p><p>These two examples illustrate how recent changes in lake level can be used to anticipate the near future of lakes. They show that ongoing climate changes along with the growing demand of natural resources have already started to impact lacustrine systems and this is likely to increase in the decades to come.</p>

scholarly journals Fishery in the Tobol-Ishim interfluve in the neolithic and early metal age

2018 ◽  
Vol 7 (4) ◽  
pp. 182-192
Author(s):  
Viktor Alekseevich Zakh
Keyword(s):  
Water Level ◽  
Bronze Age ◽  
Iron Age ◽  
Life Support ◽  
Hydrological Regime ◽  
Economic Activities ◽  
Deep Foundation ◽  
Metal Age ◽  
North Western

Landscapes of the Tobol-Ishim interfluve were not stable in the Holocene and varied from forests and drowned floodplains at the beginning of the V and III millennia BC to steppificated territories with a lowered water level at the beginning of the Atlantic Period and in the middle of the Subboreal Period, which determined the main types of economic activities, one of them was fishing. Changes in hydrological regime of water bodies influenced the methods of fishing, including the use of different traps. Thus, in the Neolithic, when the water level decreased, the location of settlements in the system river-creek-lake (for example, Mergen 6), a large number of fish bones, bone harpoons, fishing spears, fishing tackles for catching pike and a total absence of plummets were indicative of individual fishing for large fish and, perhaps, of stop net fishery, which was facilitated by a decrease in the width of watercourses and tombolos. Stop net (stake net) fishery led to a settled lifestyle of the population, collective activities and the emergence of long-term settlements with deep foundation pits of dwellings. When the water level in rivers and lakes increased and floods became more frequent, the life support system changed, the population began to develop coasts more widely, its mobility increased, and they started to build framed above-ground dwellings. Following those changes, biconic, cigar-shaped, and corniculate plummets emerged in the Tobol River Basin and on the adjacent western and north-western territories in the III and early II millennium BC. When the water level was high, it was efficient to fish using traps, seines and, probably, nets, although the latter could also be used in drive hunting for shedding geese and ducks. Subrectangular plummets with one or two ties for fastening, and disk-shaped plummets with a tie in the center had been prevailing since the beginning of the II millennium BC; they existed until the first third of the I millennium BC. This period, the transition time from the Bronze Age to the Early Iron Age, is characterized by the absence of clay plummets, while there are large accumulations of fish scales and bones in the settlement layers. We can suppose that the population of that time (local Late Bronze Age population, mixed with northern migrants who made utensils with cross ornamentation) switched from net fishing to stop net fishing.

Modeling the impact of in-stream water level fluctuations on stream-aquifer interactions at the regional scale

2011 ◽  
Vol 400 (3-4) ◽  
pp. 490-500 ◽  
Author(s):  
Firas Saleh ◽  
Nicolas Flipo ◽  
Florence Habets ◽  
Agnès Ducharne ◽  
Ludovic Oudin ◽  
...  
Keyword(s):  
Water Level ◽  
Stream Water ◽  
Regional Scale ◽  
Water Level Fluctuations ◽  
The Impact

scholarly journals A rule-based modelling concept to simulate hydromorphological measures – a tool for the design of programmes of measures for the EU Water Framework Directive

2007 ◽  
Vol 11 ◽  
pp. 101-105
Author(s):  
H. Nacken
Keyword(s):  
Water Framework Directive ◽  
Ecological Status ◽  
Morphological Structure ◽  
Eu Water Framework Directive ◽  
Rule Based ◽  
European Water ◽  
Promising Solution ◽  
Good Ecological Status ◽  
The Impact ◽  
The Eu

Abstract. Hydromorphological deficits are of real concern regarding the goals of the European Water Framework Directive to reach a good ecological status. The effects of measures that change the morphological structure of a river is hard to predict. Existing methods to simulate this process in a traditional numerical model can not be applied to whole river systems. Using a rule-based modelling concept to find feasible measures and predict the impact of those measures is a very promising solution.

scholarly journals Water Level Fluctuations in the Turawa Reservoir in Relation to the Tourist Use of the Water Body

2008 ◽  
Vol 13 (1) ◽  
pp. 133-144
Author(s):  
Andrzej T. Jankowski ◽  
Marek Ruman
Keyword(s):  
Water Level ◽  
Water Body ◽  
High Water ◽  
Ecological Condition ◽  
Water Levels ◽  
Water Level Fluctuations ◽  
Natural Factors ◽  
Odra River ◽  
The Impact ◽  
First Time

Abstract The aim of the paper is to assess the fluctuations of water levels in the Turawa Reservoir (50° 43’ N, 18° 08’ E) in relation to the tourist use of the water body. The reservoir is situated within the macroregion of the Silesian Lowland in the mesoregion of the Opole Plain. In administrative terms, the reservoir is situated in the pole Province within the borough of Turawa. In hydrological terms, in turn, it is situated in the catchment area of the Mała Panew river, which belongs to the basin of the Odra river. The Turawa Reservoir was opened for use in 1938, and in 1948 it was filled with water to its maximum for the first time. At present, the surface area of the reservoir, when it is filled with water to its maximum, is about 20.8 km2, its volume 99.5 mln m3, and its depth exceeds 13 meters. In the period of hydrological years 1976-2000 water levels in this reservoir were characterized by high, unnoticed in natural conditions, amplitudes of changes reaching 6.99 m. Anthropogenically stimulated fluctuations in the water level result in conflicts in terms of tasks and functions that the Turawa Reservoir was designed for. Changes in the level of the water surface in the Turawa Reservoir resulted from the impact of the natural factors (thaw and rainfall related high water levels), as well as anthropogenic ones (the need to improve sailing conditions, water supply for industrial and municipal needs). Decreasing the fluctuations of water levels in the Turawa Reservoir is necessary in order to maintain its tourist-recreational functions and keep the ecological condition of its waters at the appropriate level.

Limnological succession in reservoirs: a paleolimnological comparison of two methods of reservoir formation

1999 ◽  
Vol 56 (6) ◽  
pp. 1109-1121 ◽  
Author(s):  
Roland I Hall ◽  
Peter R Leavitt ◽  
Aruna S Dixit ◽  
Roberto Quinlan ◽  
John P Smol
Keyword(s):  
Water Level ◽  
Sediment Cores ◽  
Hydrological Regime ◽  
Community Change ◽  
Water Levels ◽  
Water Level Fluctuations ◽  
Lake Diefenbaker ◽  
Fossil Records ◽  
Variable Versus ◽  
Reduced Water

Analysis of diatoms, algal pigments, and chironomids in sediment cores from two otherwise similar prairie reservoirs demonstrated that differences in reservoir formation (river valley impoundment versus lake inundation) and hydrological regime (variable versus stable water level) resulted in distinct patterns of aquatic community change. Lake Diefenbaker, a 500-km2 reservoir created by damming the South Saskatchewan River in 1968, experiences water level fluctuations of 6 m·year-1. In contrast, impoundment of Buffalo Pound Lake in 1952 flooded a natural lake, raised mean water levels ~2.0 m, and reduced water level fluctuations from ~3 to <1 m·year-1. Comparison of fossil records showed that reservoir formation did not inevitably lead to eutrophication. Lake Diefenbaker exhibited typical reservoir ontogeny with three trophic periods, including an initial ~4-year period of eutrophy, a decade of mesotrophy, and a gradual shift to modern productive conditions. Planktonic taxa dominated diatom communities at all times, whereas benthic chironomid and algal remains were rare. In contrast, pigment analyses suggested that phytoplankton standing crops declined after impoundment in Buffalo Pound Lake but that chironomid and macrophyte populations expanded. Such site specificity in trophic development appears to result from differences in the extent of inundation (500 versus ~5 km2) and the magnitude of subsequent water level fluctuations (6.3 versus <1 m).

scholarly journals Long-Term Changes in Hydrological Regime of the Lakes Usma, Burtnieks and Rāzna

2012 ◽  
Vol 66 (6) ◽  
pp. 261-270
Author(s):  
Elga Apsīte ◽  
Mārtiņš Kriķītis ◽  
Inese Latkovska ◽  
Andrejs Zubaničs
Keyword(s):  
Water Level ◽  
Global Climate ◽  
Hydrological Regime ◽  
Positive Trend ◽  
Global Climate Warming ◽  
Regional Features ◽  
Natural Factors ◽  
Ice Regime ◽  
The Impact

Changes in the hydrological regime of the lakes of Latvia have been caused by several natural and human factors. This publication summarises the results of research on the long-term and seasonal changes in the water level, and thermal and ice regimes of the three biggest lakes of Latvia (Usma, Burtnieks, and Râzna) and their regional features in the period from 1926 to 2002. The levels of the lakes Usma and Râzna have been controlled, but it can be considered that changes of the water level in Lake Burtnieks have been due to the impact of natural factors during the period from 1947 to 2002. Global climate warming has caused considerable changes in the hydrological regime of the lakes during the last decades, as the water level and temperature have increased and the number of days with ice cover and the thickness of ice have decreased. A positive trend in the freezing data and statistically reliable negative trend for the ice break-up date were observed for all the lakes. Lake Usma is located in the western part of Latvia, therefore, its hydrological regime, in particular, the thermal and ice regime, differs from those of lakes Burtnieks and Râzna which are located in the northern and eastern part of Latvia, respectively.

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