caa a22 4500 445815051 CHVBK 20180317145224.0 cr unu---uuuuu 170323e20110601xx s 000 0 eng 10.1007/s10040-011-0718-1 doi (NATIONALLICENCE)springer-10.1007/s10040-011-0718-1 Evaluation of correlations between precipitation, groundwater fluctuations, and lake level fluctuations using spectral methods (Wisconsin, USA) [Elektronische Daten] [Reza Namdar Ghanbari, Hector Bravo] Evaluation des corrélations entre précipitations, fluctuations de nappe et variations d'un niveau de lac par méthodes spectrales (Wisconsin, USA) Spectral methods and 2 years of daily data were used to estimate the phase lag between precipitation and groundwater-level response, and two decades of quarterly data were used to analyze the interaction between precipitation, lake levels and groundwater in the Trout Lake watershed located in Vilas County, Wisconsin, USA. The phase-lag function between precipitation and groundwater response is used to estimate recharge travel time. The recharge travel time and precipitation-groundwater-lake interactions have been traditionally studied using time-domain methods such as physically-based modeling. In this article, the innovative and efficient use of spectral methods is demonstrated to uncover the time scales that are significant in those interactions and estimate the recharge travel time, which is extracted from the underlying daily time series data. The results consistently show that precipitation leads groundwater-level response by up to 5 days in all cases. The effects of precipitation on lake and groundwater levels display strong similarities. Both the precipitation-lake level and the precipitation-groundwater level coherency functions show significant peaks at interannual and seasonal frequencies. The groundwater level-lake level coherency function shows a significant, broad peak at interannual frequencies, and no significant peak at seasonal frequencies, demonstrating the predominance of annual and lower frequencies in groundwater-lake interaction. Springer-Verlag, 2011 Groundwater/surface-water relations nationallicence Groundwater recharge nationallicence Spectral methods nationallicence Coherence analysis nationallicence USA nationallicence Namdar Ghanbari Reza Sierra Nevada Research Institute, University of California, 5200 North Lake Road, 95343, Merced, CA, USA aut Bravo Hector Department of Civil Engineering and Mechanics, University of Wisconsin-Milwaukee, P.O. Box 784, 53201-0784, Milwaukee, WI, USA aut Hydrogeology Journal Springer-Verlag 19/4(2011-06-01), 801-810 1431-2174 19:4<801 2011 19 10040 https://doi.org/10.1007/s10040-011-0718-1 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10040-011-0718-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Namdar Ghanbari Reza Sierra Nevada Research Institute, University of California, 5200 North Lake Road, 95343, Merced, CA, USA aut NATIONALLICENCE 700 1- Bravo Hector Department of Civil Engineering and Mechanics, University of Wisconsin-Milwaukee, P.O. Box 784, 53201-0784, Milwaukee, WI, USA aut NATIONALLICENCE 773 0- Hydrogeology Journal Springer-Verlag 19/4(2011-06-01), 801-810 1431-2174 19:4<801 2011 19 10040 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer