|Titre||Wetland surface and groundwater interactions monitoring program|
|Télécharger||Téléchargement (publication entière) |
|Auteur||Strakowski, J; Renic, T; Clark, J|
|Source||Regional-scale groundwater geoscience in southern Ontario: an Ontario Geological Survey, Geological Survey of Canada, and Conservation Ontario open house; par Russell, H A J; Ford, D; Priebe, E H;
Commission géologique du Canada, Dossier public 8212, 2017 p. 34, https://doi.org/10.4095/299801 (Accès ouvert)|
|Éditeur||Ressources naturelles Canada|
|Réunion||Ontario Geological Survey and Geological Survey of Canada groundwater geoscience open house; Guelph; CA; mars 1-2, 2017|
|Media||en ligne; numérique|
|Référence reliée||Cette publication est contenue dans Russell, H A
J; Ford, D; Priebe, E H; (2017). Regional-scale groundwater geoscience in southern Ontario: an Ontario Geological Survey, Geological Survey of Canada, and Conservation Ontario open house, Commission géologique du Canada, Dossier public
|SNRC||30M/04; 30M/05; 30M/12; 40P/08; 40P/09|
|Lat/Long OENS|| -80.2500 -79.5000 43.7500 43.1667|
|Sujets||terres humides; eaux de surface; eau souterraine; aquifères; gestion des ressources; aménagement régional; bassins versants; milieu hydrologique; gradients hydrauliques; budget hydrologique; établissement
de modèles; niveaux des eaux souterraines; pression; temperature; précipitation; hydrogéologie|
|Programme||Aquifer Assessment & support to mapping, Géoscience des eaux souterraines|
|Diffusé||2017 02 22|
|Résumé||(disponible en anglais seulement)|
Wetlands are important elements of the natural environment. More than 63 km2 of the Conservation Halton watershed is covered with wetlands, 94% of which lie
above the Niagara Escarpment, an area which is headwaters to major Conservation Halton creeks. Wetlands have various functions and properties and their understanding draws on multiple disciplines from terrestrial and aquatic ecology, chemistry,
hydrology to engineering. From a hydrological point of view, wetlands can store water, lose water through evapotranspiration, recharge underlying aquifers, or collect groundwater discharge and convey it to local streams and rivers. Based on local
topographical settings, geology, groundwater levels, climatic conditions the wetland hydrological conditions may differ. To understand the wetland hydrological functions, its hydroperiod and vertical hydraulic gradient need to be understood.
the fall of 2012 Conservation Halton, in collaboration with the Regional Municipality of Halton, initiated a wetland monitoring project to address a lack of data identified during the development and calibration of an integrated surface and
groundwater GSFLOW numerical model for drinking water source protection water budget studies in the Halton-Hamilton Source Protection Region. Specifically, the wetland monitoring program was designed to enhance the understanding of surface and
groundwater interactions, their timing and fluxes. Five wetlands within Conservation Halton watershed were selected and instrumented. Wetlands 1 through 4 are located above the Niagara Escarpment and Wetland 5 is located below it. Wetland 1 is
located in the Mountsberg Conservation Area, Wetland 2 just north of 5th Concession Road and west of Highway 6 in Hamilton, Wetland 3 in Crawford Lake Conservation Area, Wetland 4 in Hilton Falls Conservation Area, and Wetland 5 on private lands in
North Oakville west of Sixth Line. Wetland 1 is classified as a swamp, Wetlands 2 and 5 are marshes, and Wetlands 3 and 4 are vernal pools.
Each wetland was instrumented with two drive point piezometers completed at different depths in close
proximity. The shallow piezometers are completed at a maximum depth of 0.1 metres and effectively measure the wetlands' hydroperiod. The deep drive point piezometers were completed at depths between 0.4 and 1.5 meters to monitor shallow groundwater
levels underneath wetlands. Each drivepoint piezometer was instrumented with an electronic datalogger measuring absolute pressure and temperature and collecting data at 10 minute or 1 hour intervals. To obtain accurate water height above sensor, the
absolute pressure data were then corrected for barometric pressure changes using atmospheric pressure data.
The results show that the wetlands above the Niagara Escarpment are very dynamic and depending on the wetland type and local conditions,
they behave differently during precipitation events. The instrumented wetland below the Escarpment is not as dynamic and mostly depends on surface water. In 2015 and 2016 three additional wetlands were added to the network in collaboration with
Conservation Halton staff. Together with our neighboring conservation authorities, who have similar monitoring programs, having more instrumented wetlands will allow to develop relationships between wetland type, hydrology and occupying species.
Collected data are an invaluable dataset to replicate natural processes in numerical modeling and a critical tool in local decision making, wetland management and watershed planning.