GEOPHYSICAL INVESTIGATION OF KANOKOLUS BOG (MAINE): IMPLICATIONS FOR PEAT BASIN DEVELOPMENT

A Maine peatland was characterized to validate process models previously developed using near surface geophysical techniques. These models have comprehensive implications for peatland development and free-phase biogenic gas distribution. Kanokolus Bog in Unity (Maine) is a 165 hectare domed bog with characteristic pools and vegetation patterning common to raised ombotrophic bogs in Maine. Ground penetrating radar (GPR) was used to detect the interface between the peat and the organic rich lake sediment layer, and to estimate depth to the mineral soil. Electrical imaging was used to determine the underlying glacio-marine sediment and peat thickness. GPR and resistivity results were compared to vegetation and surface feature mapping as well as ground truthing data to confirm basin structure. Results are used to validate two main conceptual models developed in a different northern peatland (Caribou Bog, Maine): (1) peatland development is regulated by subsurface stratigraphy and basin morphology, and is reflected in the vegetation and landform patterns, and (2) pool formation and patterning may reflect influence of esker systems underlying the developing peat surface. The relevance of these conceptual models to peatland development is tested though investigation of this previously unstudied raised bog.