Hydrological Effects and Groundwater Fluctuations in Interdunal Environments in the Nebraska Sandhills

David Gosselin, University of Nebraska - Lincoln
Venkataramana Sridhar, University of Nebraska - Lincoln
F. Edwin Harvey, University of Nebraska - Lincoln
James Goeke, University of Nebraska - Lincoln

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Published in Great Plains Research 16:1 (Spring 2006). Copyright © 2006 The Center for Great Plains Studies, University of Nebraska – Lincoln. Used by permission.

Abstract

Nine years of groundwater monitoring data has documented the important influence that topographic relief and location in the groundwater flow system have on the hydrologic function of interdunal valleys. The western "wet" valley at the Gudmundsen Sandhills Laboratory in central Nebraska, which is a net discharge area, is more strongly buffered from the effects of annual-scale climatic variability than the eastern "dry" valley. The east valley is generally an area of net recharge and as such is more responsive to climatic variability. This study employed a simple water balance approach to estimate evapotranspiration (ET) from water level measurements in the west valley for four specific time intervals in 1998-99 that included growing and senescence periods. The estimates of ET ranged between 5-6 mm/day in the mid-growing season and 2-3 mm/day during the period of senescence.