1. Ph.D. Student, Dept. of Hydraulic and Environmental Engineering, Federal Univ. of Ceará, Campus do Pici, bl. 713, 60.451-970 Fortaleza, Brazil.
2. Assistant Professor, Dept. of Hydraulic and Environmental Engineering, Federal Univ. of Ceará, Campus do Pici, bl. 713, 60.451-970 Fortaleza, Brazil (corresponding author).