1. Graduate Research Assistant, Dept. of Civil Engineering and Geological Sciences, Univ. of Notre Dame, 156 Fitzpatrick Hall, Notre Dame, IN 46556; formerly, Dept. of Geosciences and Great Lakes Wisconsin Aquatic Technology and Environmental Research (WATER) Institute, Univ. of Wisconsin–Milwaukee, Milwaukee, WI 53211.
2. Professor, Dept. of Geosciences and Great Lakes WATER Institute, Univ. of Wisconsin–Milwaukee, Milwaukee, WI 53211 (corresponding author).