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Water storage in a till catchment. I: Distributed modelling and relationship to runoff


Seibert, Jan; Bishop, K; Nyberg, L; Rodhe, A (2011). Water storage in a till catchment. I: Distributed modelling and relationship to runoff. Hydrological Processes, 25(25):3937-3949.

Abstract

While water storage is an important variable to understand the hydrological functioning of a catchment, it is challenging to estimate the total water storage in a catchment. Catchment water storage can be estimated based on the water balance, but this approach is prone to errors in the different water balance terms. Here an approach is presented to estimate the daily dynamics of catchment-wide soil- and groundwater water storage based on groundwater level observations, soil properties, and an assumption of hydrological equilibrium above the water table. This approach was applied to a 6,300 m2 till catchment in Southwest Sweden. The predicted mean catchment water storage between April 1991 and June 1992 was 210 mm and ranged from 190 to 260 mm. The estimated water storage followed runoff rates closely especially during recession periods. On average, 79% of the water storage was held in the unsaturated zone and the remaining 21% was groundwater, but this proportion varied strongly with runoff and total storage. During dry conditions unsaturated storage accounted for at maximum 95% of the water storage, during wet conditions this number dropped to 40%.

Abstract

While water storage is an important variable to understand the hydrological functioning of a catchment, it is challenging to estimate the total water storage in a catchment. Catchment water storage can be estimated based on the water balance, but this approach is prone to errors in the different water balance terms. Here an approach is presented to estimate the daily dynamics of catchment-wide soil- and groundwater water storage based on groundwater level observations, soil properties, and an assumption of hydrological equilibrium above the water table. This approach was applied to a 6,300 m2 till catchment in Southwest Sweden. The predicted mean catchment water storage between April 1991 and June 1992 was 210 mm and ranged from 190 to 260 mm. The estimated water storage followed runoff rates closely especially during recession periods. On average, 79% of the water storage was held in the unsaturated zone and the remaining 21% was groundwater, but this proportion varied strongly with runoff and total storage. During dry conditions unsaturated storage accounted for at maximum 95% of the water storage, during wet conditions this number dropped to 40%.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute of Geography
Dewey Decimal Classification:910 Geography & travel
Language:English
Date:2011
Deposited On:12 Jan 2012 15:59
Last Modified:05 Apr 2016 15:15
Publisher:Wiley-Blackwell
ISSN:0885-6087
Publisher DOI:https://doi.org/10.1002/hyp.8309
Related URLs:http://www.zora.uzh.ch/53273/

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