Nonlinear baseflow recession analysis in watersheds with intermittent streamflow


Aksoy H. , WITTENBERG H.

HYDROLOGICAL SCIENCES JOURNAL-JOURNAL DES SCIENCES HYDROLOGIQUES, cilt.56, ss.226-237, 2011 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 56 Konu: 2
  • Basım Tarihi: 2011
  • Doi Numarası: 10.1080/02626667.2011.553614
  • Dergi Adı: HYDROLOGICAL SCIENCES JOURNAL-JOURNAL DES SCIENCES HYDROLOGIQUES
  • Sayfa Sayıları: ss.226-237

Özet

Discharge in most rivers consists mainly of baseflow exfiltrating from shallow groundwater reservoirs, while surface or other direct flows cease soon after rain storms or snowmelt. Analysis of observed baseflow recessions of two rivers in Turkey with intermittent flows and different geographical and climatic characteristics yielded nonlinear storage-outflow relationships of the highly seasonal aquifers. Baseflow separation was carried out using a nonlinear reservoir algorithm. Baseflow seasonality is related to the hydro-climatic conditions influencing groundwater recharge and evapotranspiration of groundwater. As intermittent streams generally have zero flows in the dry season, calibration of recession parameters is in many cases a complicated task.