Die Windverhältnisse am Bodensee

Huss,; Stranz, D.

doi:10.1007/bf00875036

Cited by 4 publications

(2 citation statements)

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“…Upper Lake Constance consists of 2 main basins, Lake Überlingen (maximum depth ∼145 m) and the main basin, connected at the Sill of Mainau where the water depth is ∼100 m. The 2 main wind directions are SW-W and NE. Wind from SW-W prevails particularly during strong events spanning 1-7 d with a frequency of 2-9 d per month (Huss and Stranz 1970). Additionally, a day-night wind pattern also exists in the central basin of the lake and is particularly pronounced between the inଏows of Rotach and Argen (Fig.…”

Section: Study Area and ଏEld Datamentioning

confidence: 97%

Comparison of results from two 3D hydrodynamic models with field data: internal seiches and horizontal currents

2019

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Model skills of two 3D hydrodynamic models, ELCOM and Delft3D, were assessed by simulating internal seiches and surface currents and comparing the results with ଏeld data in Upper Lake Constance, Germany. Both models were set up using the same horizontal and vertical discretisation and forced by a horizontally resolved wind ଏeld. Model simulations were carried out during a stable stratiଏcation period in summer. Oscillations of the simulated and the measured isotherms in Lake Überlingen (north basin of Upper Lake Constance) indicated the existence of a Kelvin-type wave with a period of 84 h. The major wave pattern in period and amplitude was consistent between the simulations and the measurements, whereas discrepancies appeared in the phase match. The measured and the simulated vertical velocity structure in the middle of the main basin of Upper Lake Constance showed occurrence of a Poincaré-type wave with a 14 h period. Major oscillations of the velocity structure were captured by both models, and the agreement between the simulations and the measurements was higher in deep layers than in near-surface layers. Model prediction of the near-surface velocities as well as the surface circulation pattern was more accurate under high current velocities during strong winds than under weak winds. This study concluded that both ELCOM and Delft3D were signiଏcantly skilled at simulating internal wave motions and surface currents, and there was no signiଏcant diଏerence in reproducing the measured lake dynamics between ELCOM and Delft3D.

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Section: Study Area and ଏEld Datamentioning

confidence: 97%

Comparison of results from two 3D hydrodynamic models with field data: internal seiches and horizontal currents

2019

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“…The prevailing synoptic-scale winds come from the southwest-west (SW-W) and northeast (NE). The former winds prevail particularly during strong wind events that occur on 2-9 d per month and have a duration between 1 and 7 d (Huss and Stranz 1970). A mountain ridge south of Lake Ü berlingen leads to smaller wind magnitudes over Lake Ü berlingen when the wind direction is SW-W (Zenger et al 1990).…”

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confidence: 99%

Basin‐scale motion in stratified Upper Lake Constance

Appt

Imberger

Kobus

2004

Limnology & Oceanography

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This paper describes experimental and modeled wind-induced oscillations in Upper Lake Constance with an emphasis on a coherent understanding of the basin-scale internal dynamics in this example of a large and stratified lake. Data were collected with eight Lake Diagnostic Systems (LDSs) consisting of thermistor chains and wind anemometers. The isotherm displacements as measured by the LDSs were interpreted using the three-dimensional hydrodynamic Estuary and Lake Computer Model (ELCOM). Three types of basin-scale waves were found to dominate the wave motion: the vertical mode-one Kelvin wave that had an observed period around 90 h, two vertical mode-one Poincaré waves that had periods near 8 h and 12 h, and a vertical mode-two Poincaré wave that had a period near 14 h. After strong westerly winds, upwelling of cold bottom water was observed east of the Sill of Mainau, where the lake's two subbasins connect. The width and length ratios of the subbasins, spatial variations of the wind field, and rotational effects over the lake are shown to play critical roles in the details of the upwelling structure. A sudden fall of the isotherms in Lake Ü berlingen formed a surge. The reflection of the surge from the northwestern boundary induced a vertical mode-two response leading to an intrusion in the metalimnion that caused a three-layer velocity structure in the smaller subbasin.

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