A STUDY ON IMPROVEMENTS FOR A SIMULATION OF DAILY MEAN WATER TEMPERATURE IN A SHALLOW LAKE

2018 ◽  
Vol 74 (5) ◽  
pp. I_117-I_123
Author(s):  
Akira WATANUKI ◽  
Tadashi YAMADA
Keyword(s):  
Water Temperature ◽  
Shallow Lake

scholarly journals Effect of climate change on thermal-ice regime of shallow lakes compared to deep lakes: Case study of lakes in the temperate zone (Northern Poland)

2018 ◽  
Vol 78 (1) ◽  
Author(s):  
Włodzimierz Marszelewski ◽  
Bożena Pius
Keyword(s):  
Water Temperature ◽  
Surface Waters ◽  
Shallow Lakes ◽  
Thermal Regime ◽  
Shallow Lake ◽  
Deep Lakes ◽  
Deep Lake ◽  
Ice Regime ◽  
Ice Phenomena

The objective of this study is to determine the usefulness of results of hydrological observations (1961-2015) carried out in a deep lake for the assessment changes in the ice-thermal regime of a shallow lake. The paper is based on results of daily values of surface water temperature and ice phenomena in shallow Lake Łebsko and deep Lake Charzykowskie. Similar, statistically significant, positive trends of water temperature were determined in both lakes (0.26°C 10 year-1 in Lake Łebsko and 0.25°C 10 year-1 in Lake Charzykowskie). The fastest increase in mean monthly water temperature in the analysed period (1961-2015) occurred in May (3.37°C in Lake Charzykowskie) and April (2.76°C in Lake Łebsko). The majority of elements of the thermal regime of surface waters in shallow lakes were generally determined to be similar to the same elements in deep lakes, and the effect of climatic changes on the thermal regime of both lakes was found to be similar. Less similarity is observed between elements of the ice regime, particularly in date of decline of the ice cover.  

scholarly journals Opportunities and Limits of Using Meteorological Reanalysis Data for Simulating Seasonal to Sub-Daily Water Temperature Dynamics in a Large Shallow Lake

Water ◽  
2018 ◽  
Vol 10 (5) ◽  
pp. 594 ◽  
Author(s):  
Marieke Frassl ◽  
Bertram Boehrer ◽  
Peter Holtermann ◽  
Weiping Hu ◽  
Knut Klingbeil ◽  
...  
Keyword(s):  
Water Temperature ◽  
Shallow Lake ◽  
Reanalysis Data ◽  
Large Shallow Lake ◽  
Daily Water Temperature ◽  
Temperature Dynamics ◽  
Daily Water

Changes in water temperature and chemistry preceding a massive kill of bottom-dwelling fish: an analysis of high-frequency buoy data of shallow Lake Võrtsjärv (Estonia)

Inland Waters ◽  
2016 ◽  
Vol 6 (4) ◽  
pp. 535-542 ◽  
Author(s):  
Külli Kangur ◽  
Kai Ginter ◽  
Peeter Kangur ◽  
Andu Kangur ◽  
Peeter Nõges ◽  
...  
Keyword(s):  
Water Temperature ◽  
Shallow Lake ◽  
High Frequency ◽  
Lake Võrtsjärv ◽  
Buoy Data

scholarly journals Observation and Analysis of Water Temperature in Ice-Covered Shallow Lake: Case Study in Qinghuahu Lake

Water ◽  
2021 ◽  
Vol 13 (21) ◽  
pp. 3139
Author(s):  
Falong Ding ◽  
Zeyu Mao
Keyword(s):  
Heat Flux ◽  
Thermal Diffusivity ◽  
Water Temperature ◽  
Shallow Lake ◽  
Water Environment ◽  
Thermal Conditions ◽  
Late Winter ◽  
Relative Depth ◽  
Effective Thermal Diffusivity ◽  
Water Ice

Water temperature serves as a key environmental factor of lakes and the most basic parameter for analyzing the thermal conditions of a water body. Based on the observation and analysis of the water temperature of Qinghuahu Lake in the Heilongjiang Province of China, this paper analyzed the variation trend of the heat flux, effective thermal diffusivity of the icebound water, and revealed the temporal and spatial variation law of the water temperature and the transfer law beneath the ice on a shallow lake in a cold region. The results suggested a noticeable difference existing in the distribution of water temperature beneath the ice during different periods of ice coverage. During the third period, the water temperature vertically comprised three discrete layers, each of which remained unchanged in thickness despite the alternation of day and night. Sediment–water heat flux and water–ice heat flux both remained positive values throughout the freezing duration, averaging about 3.8–4.1 W/m2 and 9.8–10.3 W/m2, respectively. The calculated thermal diffusivity in late winter was larger than molecular, and the time-averaged values increased first and then decreased with water depth, reaching a maximum at a relative depth of 0.5. This research is expected to provide a reference for studies on the water environment of icebound shallow lakes or ponds in cold regions.

scholarly journals Radiative penetration dominates the thermal regime and energetics of a shallow ice-covered lake in an arid climate

2021 ◽  
Author(s):  
Wenfeng Huang ◽  
Wen Zhao ◽  
Cheng Zhang ◽  
Matti Leppäranta ◽  
Zhijun Li ◽  
...  
Keyword(s):  
Heat Flux ◽  
Water Temperature ◽  
Water Column ◽  
Shallow Lake ◽  
Thermal Structure ◽  
High Water ◽  
Bulk Water ◽  
Transmitted Radiation ◽  
Salt Exclusion ◽  
Ice Water

Abstract. The Central Asia is characterized by cold and arid winter with very little precipitation (snow), strong solar insolation, and dry air. But little is known about the thermal regimes of ice and ice-covered lakes and their response to the distinct meteorology and climate in this region. In a typical large shallow lake, ice/snow processes and under-ice thermodynamics were observed for four winters between 2015 and 2019. Heat budgets at the ice-water interface and within the water column were investigated. Results reveal that persistent bare ice permits 20 %–35 % of incident solar radiation to transmit into the under-ice water, providing background source for under-ice energy flows and causing/maintaining high water temperature (up to 6–8 °C) and high water-to-ice heat flux (annually mean 20–45 W m−2) in mid-winter. Heat balancing indicates that the transmitted radiation and water-to-ice heat flux are the dominators and highly correlated. Both bulk water temperature and its structure respond sensibly to solar transmittance and occasional snow events. Complicated evolution of thermal structure was observed and under-ice convective mixing does not necessarily occur because of the joint governance of strong irradiance, sediment heating and salinity profile. Especially, salt exclusion of freezing changes both the bulk salinity and its structure, which plays a more important role in stability/mixing of the water column in the shallow lake.

Water temperature regime of selected lakes on James Ross Island during 2015 austral summer

2017 ◽  
Vol 7 (1) ◽  
pp. 83-93 ◽  
Author(s):  
Jan Kavan
Keyword(s):  
Water Temperature ◽  
Temperature Regime ◽  
Shallow Lake ◽  
Austral Summer ◽  
Morphological Properties ◽  
Terrestrial Environment ◽  
Ir Camera ◽  
Stable Conditions ◽  
James Ross Island ◽  
Atmospheric Factors

Five lakes on the northernmost tip of James Ross Island (JRI), Ulu Peninsula, were selected to study their water temperature regime and relationship to atmospheric factors. Different genetic types of lakes were selected to cover not only influence of atmospheric parameters but also the morphology of lakes. Water temperature of all lakes showed strong similarities in the reaction to atmospheric factors no matter its genetic type or morphological properties, which were only second order factors shaping the general trends into more individual temporal patterns. All lakes are characterised by strong diurnal regime with maximum temperatures in late afternoon and minimum early morning. Most stable conditions were found in Monolith Lake and Triangular Lake, the first one with the biggest volume and regular inflow and outflow of water, the second one with semi-permanent ice cover protecting the water column from larger fluctuations caused by atmospheric factors. The most unstable environment was found in Shallow Lake, small shallow temporary lake with variable water level. Spatio-temporal issues of temperature relationships between water body and the terrestrial environment were shown with IR camera timelapse shooting on the example of Shallow Lake.

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