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Effect of climate and land cover changes on watershed runoff: A multivariate assessment for storm water management
Author(s) -
Ekness Paul,
Randhir Timothy O.
Publication year - 2015
Publication title -
journal of geophysical research: biogeosciences
Language(s) - English
Resource type - Journals
eISSN - 2169-8961
pISSN - 2169-8953
DOI - 10.1002/2015jg002981
Subject(s) - surface runoff , environmental science , runoff curve number , watershed , hydrology (agriculture) , runoff model , precipitation , climate change , water resource management , ecology , geography , meteorology , geology , geotechnical engineering , machine learning , computer science , biology
Impact of climate change and land use on watershed runoff involves multiattribute ecohydrologic interactions. This information is critical to development of comprehensive storm water management policies. Watersheds in the continental United States have diverse temperatures and precipitation regimes and varying hydrogeomorphic features that influence runoff. This study investigates watershed‐scale runoff using statistical modeling for storm water policy optimization. Multivariate statistical modeling show that vegetative activity, annual evaporation, precipitation, temperature, and soil moisture significantly influenced watershed runoff. Soil moisture has a strong influence on runoff with each percent increase causing 5% increase in runoff. Nonlinear modeling with quadratic and interaction effects shows a significant interaction between soil moisture and other climatic variables in influencing annual runoff patterns. Changes in climate affect ecohydrologic characters by altering available soil moisture, evaporation, precipitation patterns, and runoff. Optimization of green infrastructure design can be a successful management tool for runoff with an understanding that changes to multiple attributes in ecohydrologic variables affect runoff. Multi‐attribute‐based green infrastructure and incentive policies can result in comprehensive storm water policies that incorporate climatic and ecohydrologic conditions of watershed systems.