Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Discharge and water table predictions using a generalized TOPMODEL formulation
AU - Lamb, Rob
AU - Beven, Keith
AU - Myrabø, S.
PY - 1997/7
Y1 - 1997/7
N2 - A simple, generalized saturated zone formulation is presented in this paper to relax the assumption of an exponential function originally made in TOPMODEL. This saturated zone model is based on the concept of a 'discharge : relative storage' (Q Delta S) function which is derived empirically, using recession curve analysis, and may be of arbitrary form. The generalized formulation is applied to the Seternbekken MINIFELT catchment in Norway, where detailed distributed water table data have been measured. These water table data are used to suggest an empirical, power law modification of the topographic a/tan beta index. Results for the simulation through time of discharges and water table depths at a few locations show that the generalized saturated zone formulation is as efficient a simulator of the observed data as a conventional TOPMODEL, but requires one parameter less to be calibrated. The simulation of detailed water table distributions is only approximate in both cases. The modified power law index shows only a small improvement but provides a basis for a discussion of possible sources of error in the TOPMODEL assumptions for this site. (C) 1997 by John Wiley & Sons, Ltd.
AB - A simple, generalized saturated zone formulation is presented in this paper to relax the assumption of an exponential function originally made in TOPMODEL. This saturated zone model is based on the concept of a 'discharge : relative storage' (Q Delta S) function which is derived empirically, using recession curve analysis, and may be of arbitrary form. The generalized formulation is applied to the Seternbekken MINIFELT catchment in Norway, where detailed distributed water table data have been measured. These water table data are used to suggest an empirical, power law modification of the topographic a/tan beta index. Results for the simulation through time of discharges and water table depths at a few locations show that the generalized saturated zone formulation is as efficient a simulator of the observed data as a conventional TOPMODEL, but requires one parameter less to be calibrated. The simulation of detailed water table distributions is only approximate in both cases. The modified power law index shows only a small improvement but provides a basis for a discussion of possible sources of error in the TOPMODEL assumptions for this site. (C) 1997 by John Wiley & Sons, Ltd.
KW - generalized TOPMODEL
KW - a/tan beta index
KW - distributed modelling
KW - water table
KW - discharge
KW - relative storage relationship
KW - master recession curve
KW - modified local storage index
KW - FLOW
KW - RESOLUTION
KW - CATCHMENTS
KW - MODEL
U2 - 10.1002/(SICI)1099-1085(199707)11:9<1145::AID-HYP550>3.0.CO;2-C
DO - 10.1002/(SICI)1099-1085(199707)11:9<1145::AID-HYP550>3.0.CO;2-C
M3 - Journal article
VL - 11
SP - 1145
EP - 1167
JO - Hydrological Processes
JF - Hydrological Processes
SN - 1099-1085
IS - 9
ER -