D28: Internal seiche mixing study - Hydromod

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Integrated Water Resource Management for Important Deep European Lakes and their Catchment Areas EUROLAKES D28: Internal seiche mixing study FP5_Contract No.: EVK1-CT1999-00004 Version: 1.2 Date: 24.08.2004 File: D28.doc Page 84 of 92 5.2 MEASUREMENT INFORMATION ON INTERNAL WAVES As there is an apparent lack of information concerning the temporal development of the seasonal thermo- and pycnoclines in Loch Lomond it was decided within the EURO- LAKES project to carry out a long-term monitoring survey with thermistor-chains moored at three locations along the main north-south axis of the loch. These thermistor chains were planned to provide a complete one year data set on the seasonal changes in water temperature on three vertical profiles from the surface down to a maximum depth of 50 meters. In conjunction with a number of quasi-synoptic CTD-surveys and further meteorological monitoring data on solar radiation, air temperature, wind, etc. the thermistor chain data will provide more comprehensive information to obtain a better understanding of Loch Lomond’s physics and even more to get a better understanding of its complete ecosystem. North Basin Mid Basin South Basin Figure 58 : Location of long-term deployments of thermistor chains in 2002
Integrated Water Resource Management for Important Deep European Lakes and their Catchment Areas EUROLAKES D28: Internal seiche mixing study FP5_Contract No.: EVK1-CT1999-00004 Version: 1.2 Date: 24.08.2004 File: D28.doc Page 85 of 92 The monitoring survey has been carried out with thermistor chains (AANDERAA Instruments, Norway) which were provided by the “Institut für Seenforschung” in Langenargen, Germany within the frame of the scientific co-operation in the research project EUROLAKES. Management and operations during the survey were carried out by the project partners from University of Glasgow. The thermistor chain measurements were planned to cover a time period of at least one year. To gain a high resolution data set regarding the thermodynamic processes during the development phase of the summer thermocline a sampling rate of 10 minutes was chosen for the first deployment in the mid basin in May 2002. Realising that a 10 minutes measuring interval would need data collection at least every month, it was decided to switch over to a sampling rate of 30 minutes for all deployments from June 2002 onwards. In this report data from the first measurement period in summer 2002 are used to look at the relative importance of long internal waves. Figure 59 : Temperature measured by individual thermistors from May 3 rd to June 8 th 2002 by the upper chain (in 3 m to 23 m water depth every two metres) in the mid basin (Post, 2002)
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D28: Internal seiche mixing study - Hydromod

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