Hydraulics/Hydrology Seminar Series

Ganesh Mallya, Ph.D. Student, Civil Engineering, Purdue University will be presenting on Tuesday 4/25 at 1:30 p.m. in ARMS B071. The subject of the seminar is "Estimating Health of Ungauged Watershed using Machine Learning."

Estimating Health of Ungauged Watershed using Machine Learning

Ganesh Mallya
Ph.D. Student
Civil Engineering
Purdue University

Tuesday, April 25, 2017
1:30 p.m.
ARMS B071

Abstract

Observed water quality data are usually sparse in both time and space. Reconstruction of water quality time series using surrogate variables such as streamflow have been demonstrated by several studies, and this reconstructed series can then be used to evaluate risk metrics such as reliability, resilience, vulnerability and watershed health. In this study we propose to use machine learning regression models such as decision trees, AdaBoost, gradient boosting machines and random forest regression to predict watershed health and other risk metrics at ungauged HUC-10 basins using watershed attributes, long-term climate data, soil data, land use and land cover data, and geographic information as predictor variables. We have tested our models over Upper Mississippi River Basin and Ohio River Basin for water quality constituents such as suspended sediment concentration, Nitrogen and Phosphorus. Results suggest that the proposed approach provides robust estimates when we have sufficient training data. It can be used as a quick screening tool by decision makers and water quality monitoring agencies to identifying critical source areas or hotpots with respect to different water quality constituents.