GLM model data sets used to evaluate changes in the hydrodynamics of Anvil Lake, Wisconsin

Publication Date

2018-01-12

Time Period

1979-01-01

Time Period

2014-12-31

Robertson, D.M., and Kennedy, J.L., 2018, GLM model data sets used to evaluate changes in the hydrodynamics of Anvil Lake, Wisconsin: U.S. Geological Survey data release, https://doi.org/10.5066/F7DV1HVR.

Decreases in water level are expected to cause Anvil Lake and other shallow lakes to stratify fewer days, and have warmer bottom temperatures and more deep-mixing events. Increasing air temperatures should cause these lakes to have shorter ice cover, longer summer stratification period and warmer bottom temperatures. How water level affects water quality depends on how nutrient loading and lake volume vary: during drier, low-water years, lakes with large interannual changes in loading should have better water quality whereas, lakes with small changes in loading should degrade slightly. Anthropogenic changes in Anvil Lake’s watershed over the past ~100 years were about 1.5 times the effects of changes in water level when levels were low, but the effects were similar when levels were high. Climate warming is expected to increase productivity in shallow lakes because warmer air temperatures will likely increase bottom temperatures increasing sediment phosphorus release and deep mixing events enabling this phosphorus to reach the epilimnion.

• USGS Data Release Products

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