||An evaluation of the effects of anthropogenic activity on streamflow in the Columbia River Basin /
Kirschbaum, Robin L. ;
Lettenmaier, D. P.
||Washington Univ., Seattle. Dept. of Civil Engineering.;Environmental Protection Agency, Washington, DC.
|| Washington University, Dept. of Civil Engineering,
||SER/TR-156; WATER RESOURCES SER/TR-156
Streamflow--Columbia River Watershed. ;
Plant ecology--Columbia River Watershed.
Columbia River Basin ;
Stream flow ;
Man environment interactions ;
Ecological succession ;
Root distribution ;
Root systems ;
Hydrologic models ;
Hydrograph analysis ;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
||vii, 146 leaves : illustrations (some color) ; 29 cm
The primary objective of this study was to evaluate the macroscale hydrologic effects of anthropogenic changes in vegetation on streamflow. This was accomplished by comparing streamflow predictions based on current and historical vegetation scenarios. The historical frame of reference was the early 1900's and the current frame of reference was the 1990's. Changes in vegetation were represented by the assignment of vegetation parameters extracted from spatial maps of current and historical vegetation type and structural stage, where structural stage is analogous to the condition and/or successional stage of forest stands. The secondary study objective was to assess the sensitivity of predicted changes in streamflow to the specification of vegetation parameters, such as vegetation rooting depth. The model parameter which controls the vertical root distribution profile was varied in small increments as a function of structural stage and the resulting predicted current and historical scenario monthly hydrographs were compared.
"Water Resources Series, Technical Report No. 156." Includes bibliographical references. "September 1997." "PB99-115479." Microfiche.