Diurnal Dynamics in a Small Shallow Lake under Spatially Nonuniform Wind and Weak Stratification

Kimura, Nobuaki; Hoopes, John A.; Tai, Akira

doi:10.1061/(asce)hy.1943-7900.0001190

Cited by 11 publications

(18 citation statements)

References 38 publications

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“…The large geometry ratio for Lake Wingra indicates that the lake is polymictic (Kimura et al . , ). Furthermore, smaller changes in ice cover are seen during the historical and perturbation scenarios.…”

Section: Discussionmentioning

confidence: 97%

“…The large geometric ratio for Lake Wingra indicates the lake is polymictic, which can cool down quickly in the autumn ( Figure 6) and enable earlier ice formation. The large geometry ratio for Lake Wingra indicates that the lake is polymictic (Kimura et al, 2016). Furthermore, smaller changes in ice cover are seen during the historical and perturbation scenarios.…”

Section: Role Of Lake Geometry Ratiomentioning

confidence: 97%

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Effects of changing climate on ice cover in three morphometrically different lakes

Magee

2016

Hydrological Processes

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A one‐dimensional hydrodynamic lake model (DYRESM‐WQ‐I) is employed to simulate ice cover and water temperatures over the period 1911–2014. The effects of climate changes (air temperature and wind speed) on ice cover (ice‐on, ice‐off, ice cover duration, and maximum ice thickness) are modeled and compared for the three different morphometry lakes: Fish Lake, Lake Wingra, and Lake Mendota, located in Madison, Wisconsin, USA. It is found that the ice cover period has decreased due to later ice‐on dates and earlier ice‐off dates, and the annual maximum ice cover thickness has decreased for the three lakes during the last century. Based upon simulated perturbations of daily mean air temperatures across the range of −10°C to +10°C of historical values, Fish Lake has the most occurrences of no ice cover and Lake Wingra still remains ice covered under extreme conditions (+10°C). Overall, shallower lakes with larger surface areas appear more resilient to ice cover changes caused by climate changes.

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Section: Discussionmentioning

confidence: 97%

Section: Role Of Lake Geometry Ratiomentioning

confidence: 97%

Effects of changing climate on ice cover in three morphometrically different lakes

Magee

2016

Hydrological Processes

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“…Weak thermal stratification with surface-to-bottom temperature differentials of 1-4 • C has been reported and studied recently [16][17][18][19][20][21]. In summer seasons, water temperatures closely follow the diurnal cycle of solar radiation and air temperature.…”

Section: Introductionmentioning

confidence: 99%

“…Changing meteorological conditions with wind shear at the lake surface can quickly shift from a stratified period to a well-mixed regime on a daily or even hourly basis, depending on the intensity of vertical mixing produced by the wind [22]. Nevertheless, small and shallow lakes, in contrast to large lakes, have short fetches and are usually affected by wind sheltering due to onshore surroundings [20,23]. Reduction of wind-induced mixing can affect temperature stratification to cause active upper layers to be separated from nutrient-rich bottom layers, which is important to biological production and photosynthesis [24].…”

Section: Introductionmentioning

confidence: 99%

“…Using a three-dimensional (3D) hydrodynamic model with a hydrostatic pressure assumption [40,41], Coates and Folkard [29] pointed out that the mechanical drag of macrophytes plays a more important role than light attenuation. Recently, Kimura, et al [20] investigated diurnal dynamics in a small shallow lake under wind sheltering effects and showed that maximum subsurface velocities were caused by weak stratification. Vilas, et al [42] explored the impacts of littoral vegetation on spatial and temporal variation of temperature and dissolved oxygen in an urban lake.…”

Section: Introductionmentioning

confidence: 99%

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Temperature and Circulation Dynamics in a Small and Shallow Lake: Effects of Weak Stratification and Littoral Submerged Macrophytes

Torma

2019

Water

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In this paper, the effects of littoral submerged macrophytes on weak stratification conditions in a small and shallow lake are investigated. Diverse submerged macrophytes occupying a large portion of the littoral zone act as resistance to water motions and affect lake hydrodynamics. Strong solar radiation and mild wind forcing typically occurring during the summer season result in weak stratification characterized by a diurnal cycle with a temperature differential of 1-3 • C. Temperature and circulation dynamics of a small and shallow lake are depicted by extensive field measurements and a three-dimensional non-hydrostatic model with a generic length scale (GLS) approach for the turbulence closure and drag forces induced by macrophytes. Results show that the effects of macrophytes on velocity profiles are apparent. In the pelagic area, the circulation patterns with and without macrophytes are similar. The velocity profile is generally characterized by a two-layer structure with the maximum velocity at both the water surface and the mid-depth. In contrast, inside the littoral zone, the mean flow is retarded by macrophytes and the velocity profile is changed to only one maximum velocity at the surface with a steeper decrease until 2.0 m depth and another slight decrease to the lake bottom. From the whole lake perspective, littoral macrophytes dampen the horizontal water temperature difference between the upwind side and download side of the lake. Macrophytes promote a stronger temperature stratification by retarding mean flows and reducing vertical mixing. Overall, this study shows that the temperature structures and circulation patterns under weak stratification conditions in a small and shallow lake are strongly affected by littoral vegetation.

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Circulation patterns in a shallow tropical reservoir: Observations and modeling

Yang

Fong

et al. 2019

Journal of Hydro-environment Research

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Diurnal Dynamics in a Small Shallow Lake under Spatially Nonuniform Wind and Weak Stratification

Cited by 11 publications

References 38 publications

Effects of changing climate on ice cover in three morphometrically different lakes

Effects of changing climate on ice cover in three morphometrically different lakes

Temperature and Circulation Dynamics in a Small and Shallow Lake: Effects of Weak Stratification and Littoral Submerged Macrophytes

Circulation patterns in a shallow tropical reservoir: Observations and modeling

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