Advances of Modeling Water Flow in Variably Saturated Soils with SWAP

Dam, J.C. van; Groenendijk, P.; Hendriks, R.F.A.; Kroes, J.G.

doi:10.2136/vzj2007.0060

Cited by 269 publications

(164 citation statements)

References 51 publications

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“…Novák et al (2000) attached a FRACTURE module to HYDRUS in which a source term was added to the Richards equation accounting for infiltration from the bottom of the fractures, bypassing matrix bulks. Van Dam (2000), added a crack sub-model to SWAP (van Dam et al, 2008) and Hendriks et al (1999) used a code called FLOCR/AMINO, to study flow and transport phenomenon in shallow and cracked clayey unsaturated-zones in the Netherlands. A model of herbicide transport through the preferential paths was fitted successfully with the improved MACRO version 5.1 (Larsbo et al, 2005).…”

Section: Development Of Flow and Transport Models In Cracking Claysmentioning

confidence: 99%

Soil–aquifer phenomena affecting groundwater under vertisols: a review

Kurtzman

Baram

Dahan

2016

Hydrol. Earth Syst. Sci.

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Abstract. Vertisols are cracking clayey soils that (i) usually form in alluvial lowlands where, normally, groundwater pools into aquifers; (ii) have different types of voids (due to cracking), which make flow and transport of water, solutes and gas complex; and (iii) are regarded as fertile soils in many areas. The combination of these characteristics results in the unique soil-aquifer phenomena that are highlighted and summarized in this review. The review is divided into the following four sections: (1) soil cracks as preferential pathways for water and contaminants: in this section lysimeter-to basin-scale observations that show the significance of cracks as preferential-flow paths in vertisols, which bypass matrix blocks in the unsaturated zone, are summarized. Relatively fresh-water recharge and groundwater contamination from these fluxes and their modeling are reviewed; (2) soil cracks as deep evaporators and unsaturated-zone salinity: deep sediment samples under uncultivated vertisols in semiarid regions reveal a dry (immobile), saline matrix, partly due to enhanced evaporation through soil cracks. Observations of this phenomenon are compiled in this section and the mechanism of evapoconcentration due to air flow in the cracks is discussed; (3) impact of cultivation on flushing of the unsaturated zone and aquifer salinization: the third section examines studies reporting that land-use change of vertisols from native land to cropland promotes greater fluxes through the saline unsaturated-zone matrix, eventually flushing salts to the aquifer. Different degrees of salt flushing are assessed as well as aquifer salinization on different scales, and a comparison is made with aquifers under other soils; (4) relatively little nitrate contamination in aquifers under vertisols: in this section we turn the light on observations showing that aquifers under cultivated vertisols are somewhat resistant to groundwater contamination by nitrate (the major agriculturally related groundwater problem). Denitrification is probably the main mechanism supporting this resistance, whereas a certain degree of anion-exchange capacity may have a retarding effect as well.

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Section: Development Of Flow and Transport Models In Cracking Claysmentioning

confidence: 99%

Soil–aquifer phenomena affecting groundwater under vertisols: a review

Kurtzman

Baram

Dahan

2016

Hydrol. Earth Syst. Sci.

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“…Specifically, for the unimodal VGM function, the authors reported a value of 0.023 1/cm for the shape parameter a and a saturated hydraulic conductivity K s of 68.7 cm/min. Moreover, the plausible occurrence of film flow in the filter layer, which can support very high flow rates, especially at near-zero matrix potential (Tokunaga, 2009), needs to be contemplated. Under such circumstances, the hydraulic behavior of the material tends to deviate from the typical Richard's type flow, and the optimized parameters attempt to approximate a combination of fingering and film flow that likely occur in this layer.…”

Section: Kriging-based Optimizationmentioning

confidence: 99%

“…The model, previously validated against field scale measurements, was used to investigate the hydraulic response of a green roof to single precipitation events and its hydrological behavior during a two-month period. Metselaar (2012) used the SWAP model (van Dam et al, 2008) to simulate the one-dimensional water balance of a substrate layer on a flat roof with plants. Li and Babcock (2015) used HYDRUS-2D to model the hydrologic response of a pilot green roof system.…”

Section: Introductionmentioning

confidence: 99%

On the use of surrogate-based modeling for the numerical analysis of Low Impact Development techniques

Brunetti

Šimůnek

Turco

et al. 2017

Journal of Hydrology

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a b s t r a c tMechanistic models have proven to be accurate tools for the numerical analysis of the hydraulic behavior of Low Impact Development (LIDs) techniques. However, their widespread adoption has been limited by their computational cost. In this view, surrogate modeling is focused on developing and using a computationally inexpensive surrogate of the original model. While having been previously applied to various water-related and environmental modeling problems, no studies have used surrogate models for the analysis of LIDs. The aim of this research thus was to investigate the benefit of surrogate-based modeling in the numerical analysis of LIDs. The kriging technique was used to approximate the deterministic response of the widely used mechanistic model HYDRUS-2D, which was employed to simulate the variably-saturated hydraulic behavior of a contained stormwater filter. The Nash-Sutcliffe efficiency (NSE) index was used to compare the simulated and measured outflows and as the variable of interest for the construction of the response surface. The validated kriging model was first used to carry out a Global Sensitivity Analysis of the unknown soil hydraulic parameters of the filter layer, revealing that only the shape parameter a and the saturated hydraulic conductivity K s significantly affected the model response. Next, the Particle Swarm Optimization algorithm was used to estimate their values. The NSE value of 0.85 indicated a good accuracy of estimated parameters. Finally, the calibrated model was validated against an independent set of measured outflows with a NSE value of 0.8, which again corroborated the reliability of the surrogate-based optimized parameters.

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“…Moreover, eco-hydrological models such as SWAT (Arnold et al 2012), SWIM (Krysanova et al 2005) or SWAP (van Dam et al 2008) were reasonable candidates. They represent catenas and landscape organization in a lumped manner at sub-basin scale.…”

Section: Eco-hydrological Model Options and Selectionmentioning

confidence: 99%

“…IBIS (Kucharik and Brye 2003), CERES (Richie 1998 in Tsuji et al 1998), or Daisy (Abrahamsen and Hansen 2000), the models of the Wageningen-School (Ittersum et al 2003), Sucros (Simple and Universal CROp growth Simulator; Goudriaan and van Laar 1994), WOFOST (WOrld FOod STudies; Boogaard et al 1998) and SWAP (Soil Water Atmosphere Plant; Kroes and van Dam 2003) come closest to meeting these requirements. Moreover, SWAP has been applied for simulations under comparable climatic conditions and for the crops of interest in northern India (van Dam and Malik 2003). The strong hydrological focus of this approach, its comparable physical basis, the existing parameter sets for the crops of our project, availability of the code and previous studies with comparable model set-ups (Pauwels et al 2007) were strong reasons to choose SWAP/ WOFOST.…”

Section: The New Crop Subroutine Based On Swap/wofostmentioning

confidence: 99%

An experiment to gauge an ungauged catchment: rapid data assessment and eco-hydrological modelling in a data-scarce rural catchment

Jackisch

Zehe

Samaniego

et al. 2014

Hydrological Sciences Journal

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We conducted a PUB (predictions in ungauged basins) experiment looking at hydrology and crop dynamics in the semi-arid rural Mod catchment in India. The experiment was motivated by the aims (a) to develop a coupled eco-hydrological model capable of analysing land-use strategies concerning crop water need, erosion protection, crop yield and resistivity against droughts and floods, and (b) to assess the feasibility of a strategy for collecting the necessary data in a data-scarce region. Our experiment combines parsimonious data assessment and eco-hydrological model coupling at the lower mesoscale. Linking bottom-up sampling of functionally representative soil classes and top-down regionalization based on spectral properties of the same resulted in a comprehensive distributed data basis for the model. A clear focus on the dominating processes and the catena as the organizing landscape element in the given environmental setting enabled this. We employed the WASA (Water Availability in Semi-Arid environments) model for uncalibrated process-based water balance modelling and integrated a crop simulation subroutine based on the SWAP (Soil Water Atmosphere Plant) model to account for crop dynamics, feedbacks and yield estimation. While we found the data assessment strategy and the hydrological model application largely feasible, in terms of its accounting for scale, processes and model concepts, the simulation of feedbacks with crops was problematic. Contributing to the PUB issue, more general conclusions are drawn concerning spatially-distributed structural information and uncalibrated modelling.Key words eco-hydrological modelling; Prediction in Ungauged Basins (PUB); model coupling; semi-arid; rural Expérience de jaugeage d'un bassin versant non jaugé: évaluation rapide des données et modélisation éco-hydrologique dans un bassin versant rural pauvre en données Résumé Nous avons mené une expérience de prévision en bassin non jaugé (PUB) en nous intéressant à l'hydrologie et la dynamique des cultures dans le bassin versant rural semi-aride Mod en Inde. L'expérience a été menée dans le but (a) de développer un modèle éco-hydrologique couplé capable d'analyser les stratégies d'utilisation des terres concernant les besoin en eau des cultures, la protection contre l'érosion, le rendement des cultures et la résistance aux sécheresses et aux inondations, et (b) d'évaluer la faisabilité d'une stratégie de collecte des données nécessaires à une région pauvre en données. Notre expérience a combiné l'évaluation de données rares et le couplage de modèles éco-hydrologiques à petite méso-échelle. La liaison d'un échantillonnage ascendant de classes de sols fonctionnellement représentatives et sa régionalisation descendante sur la base de ses propriétés spectrales a permis d'obtenir une base de données distribuées complète pour le modèle. Cela a pu être réalisé en se concentrant sur les processus dominants et la catena organisant le paysage dans le contexte environnemental étudié. Nous avons utilisé le modèle WASA (Water Ava...

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Advances of Modeling Water Flow in Variably Saturated Soils with SWAP

Cited by 269 publications

References 51 publications

Soil–aquifer phenomena affecting groundwater under vertisols: a review

Soil–aquifer phenomena affecting groundwater under vertisols: a review

On the use of surrogate-based modeling for the numerical analysis of Low Impact Development techniques

An experiment to gauge an ungauged catchment: rapid data assessment and eco-hydrological modelling in a data-scarce rural catchment

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