scholarly journals Dissolved oxygen stratification in a small lake depending on water temperature and density and wind impact

2021 ◽  
Vol 937 (3) ◽  
pp. 032019
Author(s):  
N Palshin ◽  
G Zdorovennova ◽  
T Efremova ◽  
S Bogdanov ◽  
A Terzhevik ◽  
...  
Keyword(s):  
Dissolved Oxygen ◽  
Water Temperature ◽  
Wind Load ◽  
Density Stratification ◽  
Wind Regime ◽  
Independent Variables ◽  
Decomposition Of Organic Matter ◽  
Do Concentration ◽  
Weak Stratification

Abstract The dissolved oxygen (DO) is one of the most important parameters in lakes ecosystem. Variability of DO in lakes is associated with the absorption of oxygen due to the decomposition of organic matter and chemical reactions and the release of oxygen as a result of photosynthesis. The DO concentration also depends on seasonal changes in water temperature and mixing regime. The aim of this work is to assess the influence of seasonal thermal and density stratification on the DO stratification in a small mesotrophic lake and to develop a regression DO model, with water temperature and density and characteristics of wind regime as independent variables. Long-term measurements of water temperature and DO in small Karelian Lake Vendyurskoe in 2007-2020 were used. At the stage of spring-summer heating, three periods are considered when the water column was in the state of homothermy (May 15-June 15), weak stratification (July 15-August 15), and strong stratification (July 15-August 15). The wind load (number of days with wind speed more than 3 m/s for each period) was analysed based on the weather station Petrozavodsk data. As a result of multiple regression analysis, taking into account the wind load, dependences of DO stratification on water temperature stratification (R2 = 0.51) and water density stratification (R2 = 0.61) are found. Obtained regression DO models can be used for solving various environmental tasks.

scholarly journals Optimization of water flushing in lowland urban river in Jiaxing, Zhejiang using dissolved oxygen as the indicator

2018 ◽  
Vol 246 ◽  
pp. 02048
Author(s):  
Peiying Tan ◽  
David Z. Zhu ◽  
Yiping Zhang ◽  
Yongchao Zhou
Keyword(s):  
Water Quality ◽  
Dissolved Oxygen ◽  
Water Temperature ◽  
Urban River ◽  
Saturation Level ◽  
Evaluation Index ◽  
Urban Rivers ◽  
Time Intervals ◽  
Exponential Relationship ◽  
Do Concentration

River flushing has been considered as an effective tool for improving water quality in heavily polluted urban rivers. Dissolved oxygen (DO) as the evaluation index of water quality varied with time during and after water flushing. The time intervals between the flushing should be optimized such that the DO concentration remains above 2mg/L in the river. The duration between the flushing was found to be mainly correlated to the water temperature and the saturation level of dissolved oxygen. For the study river, when the temperature was below 15 ℃, there was an exponential relationship between the duration and saturation level of DO. For instance, the estimated duration was 157 hours or about 7 days for the subsequent flushing when the saturation level of DO was 90%. This duration was no more than 2 days when the temperature was above 15 ℃.

scholarly journals Diurnal dynamics of dissolved oxygen in the small mesotrophic lake during the under-ice heating period

2019 ◽  
Vol 151 (4) ◽  
pp. 27-39
Author(s):  
N. I. Palshin ◽  
T. V. Efremova ◽  
G. E. Zdorovennova ◽  
G. G. Gavrilenko ◽  
R. E. Zdorovennov ◽  
...  
Keyword(s):  
Dissolved Oxygen ◽  
Heating Period ◽  
Total Oxygen ◽  
Convective Mixing ◽  
Ice Surface ◽  
Irradiation Growth ◽  
Mesotrophic Lake ◽  
Daily Frequency ◽  
Do Concentration

The article investigates the dynamics of the dissolved oxygen (DO) content, the water temperature, the chlorophyll «a» and the under-ice irradiation in the small mesotrophic lake during the springtime heating period. All data were obtained from long-term observations using high-precision autonomous equipment. In the convectively mixed layer (CML) were recorded the DO oscillations up to 1 mgO2/l with daily frequency. Assumedly, these fluctuations are due to the daytime intensification of the photosynthesis on the background of under-ice irradiation growth (reaching 120 W/m2 when snow melts from ice surface) and the destruction of newly formed organic matter. The CML also exhibits the high-frequency DO fluctuations (on scales from 2—3 minutes to 3—4 hours), presumably related to convective currents and seiche activity. The involvement of oxygen-depleted water portions from underlying stratified layer to convective mixing leads to decrease of DO concentration in CML, but the total oxygen content in the water column during the under-ice convection period increases at a rate ~0.1—0.4 gO2/m2 per day due to photosynthesis enhance.

scholarly journals Dissolved oxygen and water temperature dynamics in lowland rivers over various timescales

2015 ◽  
Vol 63 (4) ◽  
pp. 353-363 ◽  
Author(s):  
Agnieszka Rajwa-Kuligiewicz ◽  
Robert J. Bialik ◽  
Paweł M. Rowiński
Keyword(s):  
Dissolved Oxygen ◽  
Water Temperature ◽  
Environmental Variability ◽  
Physical Factors ◽  
Lowland Rivers ◽  
Physical Conditions ◽  
The Impact ◽  
Floodplain Hydrology ◽  
Oxygen Dynamics

Abstract The impact of floodplain hydrology on the in-stream dissolved oxygen dynamics and the relation between dissolved oxygen and water temperature are investigated. This has been done by examining the time series of dissolved oxygen and water temperature coupled with meteorological and hydrological data obtained from two lowland rivers having contrasting hydrological settings. Spectral analysis of long-term oxygen variations in a vegetated river revealed a distinct scaling regime with slope ‘–1’ indicating a self-similar behaviour. Identical slopes were obtained for water temperature and water level. The same power-law behaviour was observed for an unvegetated river at small timescales revealing the underlying scaling behaviour of dissolved oxygen regime for different types of rivers and over various time scales. The results have shown that the oxygenation of a vegetated river is strongly related to its thermal regime and flow conditions. Moreover, analysis of short-term fluctuations in the unvegetated river demonstrated that physical factors such as rainfall and backwaters play a substantial role in the functioning of this ecosystem. Finally, the results show that the relation between water temperature and dissolved oxygen concentration at the diurnal timescale exhibits a looping behaviour on the variable plot. The findings of this study provide an insight into the sensitivity of rivers to changing hydro-physical conditions and can be useful in the assessment of environmental variability.

scholarly journals Modeling Spatial Patterns of Dissolved Oxygen and the Impact Mechanisms in a Cascade River

2021 ◽  
Vol 9 ◽  
Author(s):  
Ming Zhong ◽  
Shanxia Liu ◽  
Kun Li ◽  
Huabo Jiang ◽  
Tao Jiang ◽  
...  
Keyword(s):  
Oxygen Consumption ◽  
Dissolved Oxygen ◽  
Water Temperature ◽  
Water Environment ◽  
Oxygen Demand ◽  
Organic Contamination ◽  
Reservoir Regulation ◽  
Do Concentration ◽  
Hydro Project ◽  
The Impact

Dissolved oxygen (DO) concentration is an essential indicator for assessment of river ecosystems. A hydrodynamic and water quality mathematical model coupling one-dimensional and two-dimensional models is developed in this study. The characteristics of study area, flow velocity, temperature, and organic contamination are taken as consideration in the scenario setting. The changing processes of DO concentration are simulated in different scenarios, and the effects on DO concentration are discussed. Results indicate that: 1) A negative relation was present between DO concentration in Yongjiang River and releasing discharge of the Laokou hydro-project, since reoxygenation is greater than oxygen consumption along the river, DO concentration increases from upstream to downstream. 2) DO concentration increases with the releasing of DO in the water, which also varies along with the releasing of biochemical oxygen demand (BOD) concentration. Laokou exhibits the greatest increase of BOD, which ranges from 0.1 mg/L to 0.75 mg/L 3) The increasing of water temperature results in increased reoxygenation and a decrease in oxygen consumption. Our study shows that the water temperature increased from 19°C to 29 °C, and correspondingly saturated DO decreased from 9.25 mg/L to 7.54 mg/L. The study provides scientific support for ecology operation in the cascade river, and is expected to improve the water environment by reservoir regulation.

Long-term variability of oceanographic data at the Port Hacking 50-metre station

1977 ◽  
Vol 28 (1) ◽  
pp. 57 ◽  
Author(s):  
SD Hahn ◽  
DJ Rochford ◽  
JS Godfrey
Keyword(s):  
Dissolved Oxygen ◽  
Water Temperature ◽  
Inorganic Phosphate ◽  
Time Interval ◽  
Seasonal Cycles ◽  
Oceanographic Variables ◽  
Oceanographic Data ◽  
Annual Means

Measurements of water temperature, salinity, dissolved oxygen, nitrate and inorganic phosphate have been made at the Port Hacking 50-m station which is about 30 km south of Sydney and 5 km offshore. This paper reports an analysis of the data obtained between 1942 and 1972. Mean seasonal cycles of each of these variables have been evaluated for the time interval, as well as the annual means for each year. Shorter period fluctuations are studied by cross correlating the monthly anomalies of the various oceanographic variables.

scholarly journals Evaluation of oxythermal metrics and benchmarks for the protection of cisco (Coregonus artedi) habitat quality and quantity in Wisconsin lakes

2018 ◽  
Vol 75 (4) ◽  
pp. 600-608 ◽  
Author(s):  
John Lyons ◽  
Timothy P. Parks ◽  
Kristi L. Minahan ◽  
Aaron S. Ruesch
Keyword(s):  
Dissolved Oxygen ◽  
Great Lakes ◽  
Water Temperature ◽  
Water Column ◽  
Laurentian Great Lakes ◽  
Great Lakes Region ◽  
Wide Range ◽  
Coregonus Artedi ◽  
Oxygenated Water

The cisco (Coregonus artedi) requires cold, well-oxygenated water and is threatened by climate warming and lake eutrophication, especially at the southern edge of its range in the Laurentian Great Lakes region. In this paper, a method is described to assess the quality, quantity, and variability of suitable cisco habitat. Two metrics are proposed to characterize existing cisco oxythermal habitat in this region: water temperature in the water column at a dissolved oxygen of 6 mg/L (TDO6) and “cisco layer thickness” (CLT), the vertical extent of the water column within which water temperature is ≤22.8 °C and dissolved oxygen is ≥6 mg/L. It is proposed that values of TDO6 = 22.8 °C and CLT = 1 m be used as benchmarks to identify cisco lakes with potentially stressful oxythermal habitat. Long-term summer data from 14 Wisconsin cisco lakes with a wide range of limnological characteristics indicated that TDO6 varied from 4.2 to 27.5 °C and CLT from −6.2 to 66.7 m. Cisco abundance across lakes was greater at lower values of TDO6 and higher values of CLT, and non-attainments of the proposed benchmarks were most likely in lakes with remnant or extirpated cisco populations. Non-attainment of benchmarks could occur from late June through September, and three or more samples across the entire summer would be required to have a reasonable probability of detecting a non-attainment in TDO6 or CLT within any given year. Across years, to detect a single year of non-attainment with an 80% level of confidence, two years of sampling would be sufficient for CLT and three years for TD06; to detect more than one non-attaining year, three years of sampling for CLT and six years of sampling for TD06 would be required. Despite relatively high temporal variation in some lakes, the proposed metrics and benchmarks appear to have value for assessing cisco oxythermal habitat in the Great Lakes region.

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