Effect of the initial soil moisture content on the spatial distribution of the water retention

Merdun, Hasan; Meral, Ramazan; Demirkiran, Ali Rıza

doi:10.1134/s1064229308100128

Cited by 25 publications

(17 citation statements)

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“…In natural soils, preferential flow is also reported to occur when initial soil water content is in a range below a critical soil water threshold (Doerr & Thomas, ; Hardie et al . , ; Hardie, Lisson, Doyle, & Cotching, ; Merdun, Meral, & Demirkiran, ).…”

Section: Resultsmentioning

confidence: 99%

“…In this study, it is more likely that the less θ 0 in intraaggregate pores results in a reduction of lateral flow from inter-aggregates pores into intra-aggregate pores, which in return promotes the occurrence of preferential flow in inter-aggregate pores. In natural soils, preferential flow is also reported to occur when initial soil water content is in a range below a critical soil water threshold (Doerr & Thomas, 2000;Hardie et al, 2011;Hardie, Lisson, Doyle, & Cotching, 2013;Merdun, Meral, & Demirkiran, 2008).…”

Section: Possible Reason For Different Flow Types and Implicationmentioning

confidence: 99%

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Hydrologic response of engineered media in living roofs and bioretention to large rainfalls: experiments and modeling

Liu

Fassman‐Beck

2016

Hydrological Processes

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The hydrologic response of engineered media plays an important role in determining a stormwater control measure's ability to reduce runoff volume, flow rate, timing, and pollutant loads. Five engineered media, typical of living roof and bioretention stormwater control measures, were investigated in laboratory column experiments for their hydrologic responses to steady, large inflow rates. The inflow, medium water content response, and outflow were all measured. The water flow mechanism (uniform flow vs. preferential flow) was investigated by analyzing medium water content response in terms of timing, magnitude, and sequence with depth. Modeling the hydrologic process was conducted in the HYDRUS‐1D software, applying the Richards equation for uniform flow modeling, and a mobile–immobile model for preferential flow modeling. Uniform flow existed in most cases, including all initially dry living roof media with bimodal pore size distributions and one bioretention medium with unimodal pore size distribution. The Richards equation can predict the outflow hydrograph reasonably well for uniform flow conditions when medium hydraulic properties are adequately represented by appropriate functions. Preferential flow was found in two media with bimodal pore size distributions. The occurrence of preferential flow is more likely due to the interaction between the bimodal pore structure and the initial water content rather than the large inflow rate.

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Section: Resultsmentioning

confidence: 99%

Section: Possible Reason For Different Flow Types and Implicationmentioning

confidence: 99%

Hydrologic response of engineered media in living roofs and bioretention to large rainfalls: experiments and modeling

Liu

Fassman‐Beck

2016

Hydrological Processes

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“…Hanson et al (2004) found that deep percolation occurred during dry seasons. Merdun et al (2008) reported that preferential flow was more evident when soil was initially dry. This finding may have been the result of using samples collected at a specific time of the year or because the authors included soils with different soil textures, organic carbon contents, and pH as well as different plant species (Benito Rueda et al, 2016).…”

Section: Soil Water Flow With Preferential Flow Paths In Field Dye-trmentioning

confidence: 99%

Interaction Between Plant Roots and Soil Water Flow in Response to Preferential Flow Paths in Northern China

et al. 2016

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Preferential flow is expected to provide preferential channels for plant root growth and variations in soil water flow, but few studies were conducted to imply the impacts of these changes, particularly for preferential flow in stony soils. This study aimed to characterize soil water flow and plant root distribution in response to preferential flow paths and quantitatively describe the relation between plant root distribution and soil water flow. Field dye‐tracing experiments centered on experimental plants were conducted to determine the root length density and soil water flow process. Laboratory analyses were performed to characterize changes in the relative concentration of the accumulated effluent and the degree of interaction between plant roots and soil water flow. The amount of fine plant roots with preferential flow paths decreased with increasing soil depth for all experimental plots. The largest plant roots were recorded in the upper soil layers to a depth of 20 cm. The relative concentration of the accumulated effluent increased with time and decreased with soil depth under saturated soil conditions, whereas a distinct early turning point for the relative concentration of the accumulated effluent was observed in the 0–20‐cm soil columns, and the relative concentration of the accumulated effluent initially decreased and then increased with time under unsaturated soil conditions. This study provides quantitative information with which to characterize the interaction between plant roots and soil water flow in response to preferential flow paths in soil–plant–water systems. Copyright © 2016 John Wiley & Sons, Ltd.

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“…Drainage flow is strongly influenced by initial soil moisture, as shown by Merdun et al (2008) in experimental plots with clay soil in Turkey. In this trial on the LGT lysimeter, initial soil moisture was about 67% of saturation level.…”

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confidence: 97%

Runoff from soils under different management and simulated rainfall regimes in southern Brazil

Kaufmann

Pinheiro

Castro

et al. 2014

Hydrological Sciences Journal

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Surface runoff and drainage were evaluated for southern Brazilian soils subjected to different rainfall intensities and management practices. Soils received up to four applications of simulated rainfall in sequences with one application per day. Seven lysimeters, each of 1 m 3 volume, were used to measure drainage volume, with measurement of initial and final water content, times at which surface runoff and lysimeter drainage began, and the volume rates of flow. At the end of the second test, soils were subjected to two levels of disturbance (denoted by low and high soil movement) by opening furrows. These cultivation treatments altered the times at which lysimeter surface runoff and drainage were initiated, the rates of surface runoff, the final infiltration and internal drainage, and the components of the water balance throughout the series of trials. Mean times at which surface runoff was initiated in lysimeters subjected to greater soil disturbance were longer than those with little soil disturbance. Final infiltration rates were greater in lysimeters with little soil disturbance. It was also found that lysimeter surface runoff generation was influenced by the state of development of maize grown in the lysimeter.Ruissellement sur des sols soumis à différents modes de gestion et régimes de pluie simulée dans le Brésil méridional Résumé Le ruissellement et le drainage ont été évalués pour des sols du Brésil méridional, soumis à différentes intensités de pluie et pratiques de gestion. Les sols ont reçu jusqu'à quatre applications de pluie simulée de suite, avec une application par jour. Sept lysimètres, chacun d'un volume de 1 m 3 , ont été utilisés pour mesurer le volume de drainage, avec une mesure des teneurs en eau initiale et finale, des instants auxquels le ruissellement et le drainage du lysimètre ont commencé, et des taux volumétriques d'écoulement. A la fin du deuxième test, les sols ont été soumis à deux niveaux de perturbation (désignés par modifications fortes et faibles), en ouvrant des sillons. Ces traitements culturaux ont modifié les moments de démarrage du ruissellement de surface et de drainage des lysimètres, les taux de ruissellement de surface, l'infiltration et le drainage interne finaux, et les composantes du bilan en eau tout au long de la série d'essais. Les temps moyens de début de ruissellement dans les lysimètres ayant subi de fortes modifications ont été plus grands que dans ceux peu modifiés. Les taux finaux d'infiltration s étaient plus élevées dans les lysimètres avec des modifications faibles du sol. Il a également été constaté que la genèse du ruissellement était influencée par le stade de développement du maïs cultivé dans les lysimètres.

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Effect of the initial soil moisture content on the spatial distribution of the water retention

Cited by 25 publications

References 17 publications

Hydrologic response of engineered media in living roofs and bioretention to large rainfalls: experiments and modeling

Hydrologic response of engineered media in living roofs and bioretention to large rainfalls: experiments and modeling

Interaction Between Plant Roots and Soil Water Flow in Response to Preferential Flow Paths in Northern China

Runoff from soils under different management and simulated rainfall regimes in southern Brazil

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