Modeling runoff generation in the Geer river basin with improved model parameterizations to the REW approach

Zhang, Guoping; Fenicia, Fabrizio; Rientjes, T.H.M.; Reggiani, P.; Savenije, Hubert

doi:10.1016/j.pce.2004.11.002

Cited by 20 publications

(18 citation statements)

References 28 publications

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“…2.2.3 Additional functional relationships for the closure of the water balance equations Zhang et al (2004bZhang et al ( , 2005a proposed an expression for the saturation overland flow area fraction, which has the following form:…”

Section: Infiltrationmentioning

confidence: 99%

“…Thus, proper closure relations are keys to a successful application of the approach. Zhang et al (2005a) made a step towards a better model parameterisation and showed encouraging results when applied to a temperate humid watershed. Meanwhile, it is obvious that an incomplete description of hydrological processes inevitably results in poor performance and leads to erroneous results.…”

Section: Introductionmentioning

confidence: 99%

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Rainfall-runoff modelling in a catchment with a complex groundwater flow system: application of the Representative Elementary Watershed (REW) approach

Zhang

Savenije

2005

Hydrol. Earth Syst. Sci.

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Abstract. Based on the Representative Elementary Watershed (REW) approach, the modelling tool REWASH (Representative Elementary WAterShed Hydrology) has been developed and applied to the Geer river basin. REWASH is deterministic, semi-distributed, physically based and can be directly applied to the watershed scale. In applying REWASH, the river basin is divided into a number of sub-watersheds, so called REWs, according to the Strahler order of the river network. REWASH describes the dominant hydrological processes, i.e. subsurface flow in the unsaturated and saturated domains, and overland flow by the saturation-excess and infiltration-excess mechanisms. The coupling of surface and subsurface flow processes in the numerical model is realised by simultaneous computation of flux exchanges between surface and subsurface domains for each REW. REWASH is a parsimonious tool for modelling watershed hydrological response. However, it can be modified to include more components to simulate specific processes when applied to a specific river basin where such processes are observed or considered to be dominant. In this study, we have added a new component to simulate interception using a simple parametric approach. Interception plays an important role in the water balance of a watershed although it is often disregarded. In addition, a refinement for the transpiration in the unsaturated zone has been made. Finally, an improved approach for simulating saturation overland flow by relating the variable source area to both the topography and the groundwater level is presented. The model has been calibrated and verified using a 4-year data set, which has been split into two for calibration and validation. The model performance has been assessed by multi-criteria evaluation. This work representsCorrespondence to: G. P. Zhang (g.p.zhang@citg.tudelft.nl) a complete application of the REW approach to watershed rainfall-runoff modelling in a real watershed. The results demonstrate that the REW approach provides an alternative blueprint for physically based hydrological modelling.

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Section: Infiltrationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Rainfall-runoff modelling in a catchment with a complex groundwater flow system: application of the Representative Elementary Watershed (REW) approach

Zhang

Savenije

2005

Hydrol. Earth Syst. Sci.

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“…In the literature, the delimitation of rain events is variable and depends greatly on the subject of study and on the time resolution of the data. According to Brown et al (1985), rain events are a convenient way to dissect a time series into a set of sections, which is useful for specific applications such as the study of runoff (de Vos and Rientjes, 2008;Zhang et al, 2005), soil erosion (Angel et al, 2005), interception losses (Zeng et al, 2000) and the modelling of rainfall (Abdo et al, 2009;Woolhiser and Osborn, 1985). It seems there is not a 'natural' way to separate events, and we can always relate rainfall and runoff without separating events, by comparing the totals of both series or, if available, the yearly or monthly totals.…”

Section: Introductionmentioning

confidence: 99%

Rainfall timing and runoff: The influence of the criterion for rain event separation

Molina-Sanchis

Lázaro

Arnau-Rosalén

et al. 2016

Journal of Hydrology and Hydromechanics

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Rain is not uniform in time and space in semiarid areas and its distribution is very important for the runoff process. Hydrological studies usually divide rainfall into events. However, defining rain events is complicated, and rain characteristics vary depending on how the events are delimited. Choosing a minimum inter-event time (MIT) is a commonly used criterion. Our hypothesis is that there will be an optimal MIT that explains the maximum part of the variance of the runoff, with time to runoff used as a surrogate. The objective is to establish a procedure in order to decide upon this optimal MIT. We developed regressions between time to runoff (T 0 ) and three descriptive variables of rain. Our results show that the optimum MIT is 1 hour, which seems to be the minimum period of time required for water in larger macropores to drain and sufficiently modify the effect of antecedent soil moisture on the runoff generation process. Rain events are classified into three significantly different groups: (1) large and intense rains, (2) light rains on wet soil, and (3) light rains on dry soil. Intense rains produce most of the runoff, but there were significant differences between small events in the runoff generated. Of rain events, 63.75% are single-tip events, and many could be dew.

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“…Earlier publications (Reggiani et al, 2000(Reggiani et al, , 2001Reggiani and Rientjes, 2005;Zhang et al, 2005a;Zhang and Savenije, 2005) proposed a set of closure relations to the general form of the balance equations. Subsequently, new and revised equations for threshold-based interception, evaporation and transpiration, the Green-Ampt type infiltration, and Darcy type percolation etc., have been obtained, leading to the model code REWASH.…”

Section: Brief Review Of the Rew Approach And The Rewash Codementioning

confidence: 99%

Modelling subsurface storm flow with the Representative Elementary Watershed (REW) approach: application to the Alzette River Basin

Zhang

Savenije

Fenicia

et al. 2006

Hydrol. Earth Syst. Sci.

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Abstract.A new domain, the macropore domain describing subsurface storm flow, has been introduced to the Representative Elementary Watershed (REW) approach. The mass balance equations have been reformulated and the closure relations associated with subsurface storm flow have been developed. The model code, REWASH, has been revised accordingly. With the revised REWASH, a rainfall-runoff model has been built for the Hesperange catchment, a subcatchment of the Alzette River Basin. This meso-scale catchment is characterised by fast catchment response to precipitation, and subsurface storm flow is one of the dominant runoff generation processes. The model has been evaluated by a multi-criteria approach using both discharge and groundwater table data measured at various locations in the study site. It is demonstrated that subsurface storm flow contributes considerably to stream flow in the study area. Simulation results show that discharges measured along the main river course are well simulated and groundwater dynamics is well captured, suggesting that the model is a useful tool for catchment-scale hydrological analysis.

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Modeling runoff generation in the Geer river basin with improved model parameterizations to the REW approach

Cited by 20 publications

References 28 publications

Rainfall-runoff modelling in a catchment with a complex groundwater flow system: application of the Representative Elementary Watershed (REW) approach

Rainfall-runoff modelling in a catchment with a complex groundwater flow system: application of the Representative Elementary Watershed (REW) approach

Rainfall timing and runoff: The influence of the criterion for rain event separation

Modelling subsurface storm flow with the Representative Elementary Watershed (REW) approach: application to the Alzette River Basin

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