Hidrodinâmica Em Solos Típicos Dos Tabuleiros Costeiros No Recôncavo Da Bahia

Santos, Maria Magali Mota; Pereira, Fernanda Aparecida Castro; Souza, Luciano da Silva; Santos, Emanuela Barbosa; Silveira, Felipe Gomes Frederico da

doi:10.15809/irriga.2019v24n4p770-780

Cited by 3 publications

(2 citation statements)

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“…The study of physical-water processes that occur in the soil, such as water infiltration, requires the estimation of its hydrodynamic parameters [1][2][3]. For this purpose, semi-physical methods have been used over the years, such as the Beerkan and Beerkan Estimation of Soil Transfer (BEST).…”

Section: Introductionmentioning

confidence: 99%

Estimation of the Hydrodynamic Parameters of Soils Subjected to Water Scarcity: Application of BEST and Introduction of a Specific Methodology

Holanda

Oliveira

Soares

2021

JEAI

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Propose a specific method (Junction Between Arya and Heitman and Haverkamp - JAHH), similar to BEST, to obtain the hydrodynamic parameters of soils in Pernambuco, Brazil. Sample: Department of Civil Engineering, Polytechnic School of Pernambuco – POLI, between March 2019 and February 2021. For this, BEST and JAHH were used to obtain the hydrodynamic characteristics of the collected materials, and the results of both methods were compared with simulations performed in Hydrus-1D. Sorptivity and Ks, acquired using both methods, presented differences reached 68.38% regarding Ks. The characteristic radius of the pores (λm) and capillary length (λc) obtained with BEST are not coherent, and this can be explained because during the evaluation of one sandy soil, λm values were the highest and λc were the lowest, when the opposite was expected. The use of JAHH to estimate soil parameters could generate more coherent estimates than BEST-slope, even though both of them have presented results of the same proportion, such as sorptivity and saturated hydraulic conductivity, for exemple. Therefore, the proposed method presented more pertinent results when compared to BEST regarding the studied soils.

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Section: Introductionmentioning

confidence: 99%

Estimation of the Hydrodynamic Parameters of Soils Subjected to Water Scarcity: Application of BEST and Introduction of a Specific Methodology

Holanda

Oliveira

Soares

2021

JEAI

View full text Add to dashboard Cite

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“…To reduce the uncertainties of the parameter estimates, fixed values of r = 0 and l = 0.5 were used. Ks values were determined based on studies carried out with soils like the one used in this study (Santos 2018;Silva 2019). r was fixed at this value because, in all simulations, its value converged to zero, and the used value of Ks (15.0, 7.2 and 3.0 for 0-15, 15-30 and 30-45 cm soil depth, respectively) corresponds to measurements performed in soils from the region.…”

Section: Obtaining a Set Of Vgm Parametersmentioning

confidence: 99%

Stochastic assessment of soil water balance components: development and application in a hardsetting soil scenario

Santos¹

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Soil hydraulic properties (SHP) are commonly determined in soil samples with replicas. Whether these replicas are taken at a same location to represent a specific point or at several locations to represent a larger area, results should be merged into a final dataset to be used in modelling. For this dataset to be representative, standard errors and correlation matrix must be considered in the merging process. We present a method to perform this merging and give an example using stochastic realizations of van Genuchten-Mualem (VGM) parameters generated by Cholesky decomposition to merge the SHP and associated statistics into a merged parameter set. To do so, we used VGM parameters obtained at sample-scale in three replicas from a Brazilian savanna soil through inverse modelling of laboratory evaporation experiments. The effectiveness and representativeness of the proposed methodology were evaluated by observing the frequency distribution of different levels of output, comparing individual and merged sample properties. The outputs include VGM parameters, retention and conductivity characteristics, and water balance components stochastically predicted by a hydrological model. The performed stochastic merging correctly represented the variability of the combined replicas, especially with respect to hydrological model outputs of soil water balance components. Using the mean hydraulic property parameter values to deterministically predict water balance components may yield values that are substantially different from the mean values of stochastic realizations. This suggests that the deterministic prediction using mean parameter values in vadose zone hydrological modelling may result in unrepresentative outputs.

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Soil Penetration Resistance and Sugarcane Rooting Under Subsuperficial Drip Irrigation Levels

et al. 2022

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Knowledge of the soil water regime in a dynamic equilibrium condition (steady state) of the emitter–soil–plant system is essential to evaluate the adopted irrigation management, aiming to maximize the water use efficiency in irrigation. Thus, our objective was to determine the integrated effect of four irrigation levels on the soil moisture (θv) distribution pattern, mechanical soil penetration resistance (PR), and sugarcane rooting. Irrigation levels were established based on the percentage of reference evapotranspiration (ETo), as follows: 40% (W1), 70% (W2), 100% (W3), and 130% (W4) of ETo. From the soil moisture profile and PR versus θv regression models, PR profiles for each irrigation level were estimated. At the end of the crop cycle, trenches were opened to assess sugarcane root system. According to the results, the water dynamic in the soil profile resulted in a soil-wetting pattern that did not match the sugarcane rooting profile. For treatments W3 and W4 the wetting pattern indicated water loss through deep percolation. For all treatments and considering the entire soil profile, the PR values ranged from < 2 to 10 MPa. Also, the roots were superficially spread and limited to the first 0.35 m in depth for all irrigation depths applied. Although the soil wetting by irrigation reduced the strength of the cohesive layer, this reduction was insufficient to allow the deepening of plant roots. The su garcane root development was limited to the region of the soil profile defined by a PR value approximately equal to 2.0 MPa.

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Hidrodinâmica Em Solos Típicos Dos Tabuleiros Costeiros No Recôncavo Da Bahia

Cited by 3 publications

References 0 publications

Estimation of the Hydrodynamic Parameters of Soils Subjected to Water Scarcity: Application of BEST and Introduction of a Specific Methodology

Estimation of the Hydrodynamic Parameters of Soils Subjected to Water Scarcity: Application of BEST and Introduction of a Specific Methodology

Stochastic assessment of soil water balance components: development and application in a hardsetting soil scenario

Soil Penetration Resistance and Sugarcane Rooting Under Subsuperficial Drip Irrigation Levels

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