Avaliação da condutividade hidráulica em dois usos do solo na região central do Brasil

Soto, Miguel Angel Alfaro; Kiang, Chang Hung

doi:10.5327/z2176-947820180169

Cited by 5 publications

(4 citation statements)

References 6 publications

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“…We have also found that in areas with more intense cultivation, as in the municipalities of Quixeré and Limoeiro do Norte, hydraulic conductivity values were lower than in non-cultivated soils, making infiltration and aquifer recharge more difficult. These results are aligned with the findings of Soto and Kiang (2018).…”

Section: Slope and Surface Runoff Of Soilssupporting

confidence: 90%

Groundwater vulnerability to agrochemical contamination

Soares

Silva

Filho

et al. 2020

Rev. Bras. Ciênc. Ambient. (Online)

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This research aimed at evaluating groundwater vulnerability to agrochemical contamination. To that end, we developed an index called Hydric Vulnerability and Agrochemical Contamination Index (HVACI), which integrates a geographic information system and fuzzy logic to measure catchment vulnerability to agrochemical contamination. Our case study investigates two sub-basins, the Baixo Jaguaribe and the Médio Jaguaribe, in the state of Ceará, Brazil. We built a logical relationship matrix involving economic and environmental information as a tool to enhance public managers' decision-making capabilities. Evaluation was based on four categories of vulnerability — high, medium-high, medium-low, and low —, and we found that the joint area of the Baixo Jaguaribe and Médio Jaguaribe sub-basins presented the following levels of risk contamination: 80.3% of the area had low vulnerability, 3.5% had medium-low vulnerability, 3.0% had medium-high vulnerability, and 13.2% had high vulnerability. Geographically, the municipalities with high vulnerability to contamination by pesticides were Aracati, Icapuí, Limoeiro do Norte, Tabuleiro do Norte, and Quixeré. Therefore, HVACI is an important tool for directing environmental management efforts toward areas identified as highly vulnerable to agrochemical contamination.

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Section: Slope and Surface Runoff Of Soilssupporting

confidence: 90%

Groundwater vulnerability to agrochemical contamination

Soares

Silva

Filho

et al. 2020

Rev. Bras. Ciênc. Ambient. (Online)

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“…This method does not have many difficulties in its execution and results in more homogeneous values. Unfortunatelly, the concentric ring method offers overestimated values of k sat , due to the imposed hydraulic head 30 .…”

Section: Methodsmentioning

confidence: 99%

Statistical evaluation of testing conditions on the saturated hydraulic conductivity of Brazilian lateritic soils using artificial intelligence approaches

Souza

Pereira

Mendes

et al. 2022

Sci Rep

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The saturated hydraulic conductivity, ksat, is a crucial variable to describe the hydromechanical behavior of soils. The value of ksat of lateritic soils that are typically found in tropical regions is highly affected by the soil’s structure, void ratio, and fine particle aggregation. As a result, the determination of ksat in the field or in the laboratory is complex and involves greater variability, depending on the type of test and on the spatial location of sampling. This paper presents a study of ksat values of lateritic soils, analyzing them using Statistic, Multilayer Perceptron Artificial Neural Networks (ANN) and Decision Trees (CHAID). This study aims to support decision-making regarding the type of test and depth chosen for sampling in laterite soils and understanding the factors influencing the permeability of such soils. An extensive literature review on the ksat values of lateritic soils was performed, providing data for the establishment of a database comprise of 722 registries. According to agronomic and geotechnical soil classifications, the Brazilian lateritic soils presents a “moderate” hydraulic conductivity. A significant variation of permeability values along the depth was identified, particularly for depths between 0.1 and 0.2 m. Regarding the importance of testing variables, the ANN indicated a high dependency on the type of test. The decision tree divided field test and laboratory test automatically, inferring the relevance of the type of test to the determination of ksat.

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“…The proposed apparatus is also intended for the study of erosion processes, therefore requiring runoff generation. However, the saturated hydraulic conductivity of typical soils in the region is relatively high [46][47][48]. Therefore, runoff is generated only during high intensity events.…”

Section: Methodsmentioning

confidence: 99%

Development of a Rainfall and Runoff Simulator for Performing Hydrological and Geotechnical Tests

et al. 2021

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Laboratory apparatuses for the analysis of infiltration and runoff enable studies under controlled environments and at reduced costs. Unfortunately, the design and construction of such systems are complex and face difficulties associated with the scale factor. This paper presents the design, construction, and evaluation of a portable rainfall and runoff simulator. The apparatus allows the evaluation of unsaturated soils with and without vegetation cover, under a wide range of simulation scenarios. The apparatus also enables the control of the intensity, size, and uniformity of simulated raindrops for variable surface slope, specimen thickness, and length conditions. The monitoring of the volumetric water content and matric suction and a rigorous computation of water balance are ensured. The obtained results indicate that the automated rainfall generator produces raindrops with Christiansen uniformity coefficients higher than 70%, and with an adequate distribution of raindrop sizes under a range of rainfall intensities between 86.0 and 220.0 mm h−1. The ideal rainfall generator conditions were established for a relatively small area equal to or lower than 1.0 m2 and considering rainfall events with return periods of 10 to 100 years.

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Avaliação da condutividade hidráulica em dois usos do solo na região central do Brasil

Cited by 5 publications

References 6 publications

Groundwater vulnerability to agrochemical contamination

Groundwater vulnerability to agrochemical contamination

Statistical evaluation of testing conditions on the saturated hydraulic conductivity of Brazilian lateritic soils using artificial intelligence approaches

Development of a Rainfall and Runoff Simulator for Performing Hydrological and Geotechnical Tests

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