HOW TÓTHIAN CONCEPTS INFLUENCED THE MODERN UNDERSTANDING OF PEATLAND HYDROLOGY
This concept of lateral flow dominated peatland hydrology was challenged by Siegel (1981,1983) who published the first numerical model simulations of groundwater flow in a large peat basin. He based his conceptual model on one of Tóth's analytical examples showing local groundwater flow cells developing under sinusoidal groundwater mounds on a gentle regional hydraulic gradient. This work suggested that groundwater flow could penetrate deep below the peat veneer under raised bogs in the Glacial Lake Agassiz peatlands of Minnesota.
The results of subsequent field work there and in the Hudson Bay Lowland (Canada)broadly agreed with results of this numerical model but posed new problems: under some large raised bogs, deep recharge cells did not occur. Reeve et al. (2000;2001) investigated the cause of these differences with a more detailed numerical analysis that showed sand and gravel under some bogs focused deep local recharge. All these studies,fundamentally based on of Toth's concepts, helped change the paradigm of modern peatland hydrologeology.
Siegel, D.I., 1981, Hydrogeologic setting of the Glacial Lake Agassiz Peatland, northern Minnesota: U.S. Geological Survey Water-Resources Investigations 81-24, 32 p.
Siegel, D.I., 1983, Groundwater and evolution of the Glacial Lake Agassiz: Journal of Ecology, vol. 71, p. 913-921.
Reeve, A.S., Siegel, D.I., and Glaser, P.H., 2000, Simulating vertical flow in large peatlands, Journal of Hydrology, vol. 227, p.207-217.
Reeve, A.S., Warzocha, J., Siegel, D.I., and Glaser, P.H., 2001,Regional ground-water flow modeling of the glacial lake Agassiz peatlands, Minnesota, J. Hydrology, vol. 243, pp 91-100