caa a22 4500 445815132 CHVBK 20180317145225.0 cr unu---uuuuu 170323e20110601xx s 000 0 eng 10.1007/s10040-011-0740-3 doi (NATIONALLICENCE)springer-10.1007/s10040-011-0740-3 Time series analysis of daily rainfall and streamflow in a volcanic dike-intruded aquifer system, O‘ahu, Hawai‘i, USA [Elektronische Daten] [Alan Mair, Ali Fares] Analyse de séries chronologiques de précipitations journalières et de débits de cours d'eau dans un système aquifère volcanique avec intrusion de dykes à O‘ahu (Hawaï, USA) A conceptual model of groundwater occurrence was developed for a dike-intruded aquifer system in Mākaha valley, O‘ahu, Hawai‘i, USA, and used to explain the impacts of water resource development on groundwater levels and streamflow. Time-series analyses were applied to two subsets of daily rainfall, total flow, and baseflow—from the third (1946-1968) and fourth (1968-1991) periods of development—to evaluate changes in streamflow response. Autocorrelation, cross-correlation, squared coherency and phase functions were used to estimate the decorrelation lag time, and the correlation length, linearity with frequency, and frequency response delay between rainfall and streamflow. The decorrelation lag time for total flow and baseflow declined by 16-20days (d). The correlation length between rainfall and streamflow declined 4-7d for total flow and 10-13d for baseflow. The squared coherency function indicates an overall decline in linearity between rainfall and total flow across most frequencies. The changes in hydrologic response following increased water-resource development is consistent with a model of groundwater depletion resulting in less groundwater discharge and more induced groundwater recharge. Changes in streamflow response are inconsistent with observed changes in rainfall and imply that streamflow decline is more likely to be the result of groundwater pumping. Springer-Verlag, 2011 Volcanic aquifer nationallicence Conceptual models nationallicence Rainfall/runoff nationallicence Groundwater/surface-water relations nationallicence USA nationallicence Mair Alan Department of Geology & Geophysics and Water Resources Research Center, University of Hawai‘i at Mnoa, 1680 East-West Road, POST 701, 96822, Honolulu, HI, USA aut Fares Ali Department of Natural Resources and Environmental Management, University of Hawai‘i at Mnoa, 1910 East-West Road, Sherman Lab 101, 96822, Honolulu, HI, USA aut Hydrogeology Journal Springer-Verlag 19/4(2011-06-01), 929-944 1431-2174 19:4<929 2011 19 10040 https://doi.org/10.1007/s10040-011-0740-3 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10040-011-0740-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Mair Alan Department of Geology & Geophysics and Water Resources Research Center, University of Hawai‘i at Mnoa, 1680 East-West Road, POST 701, 96822, Honolulu, HI, USA aut NATIONALLICENCE 700 1- Fares Ali Department of Natural Resources and Environmental Management, University of Hawai‘i at Mnoa, 1910 East-West Road, Sherman Lab 101, 96822, Honolulu, HI, USA aut NATIONALLICENCE 773 0- Hydrogeology Journal Springer-Verlag 19/4(2011-06-01), 929-944 1431-2174 19:4<929 2011 19 10040 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer