Effects of Spatial Variability of Saturated Hydraulic Conductivity on Hortonian Overland Flow

1996 ◽  
Vol 32 (3) ◽  
pp. 671-678 ◽  
Author(s):  
D. A. Woolhiser ◽  
R. E. Smith ◽  
J.-V. Giraldez
Keyword(s):  
Hydraulic Conductivity ◽  
Spatial Variability ◽  
Overland Flow ◽  
Saturated Hydraulic Conductivity

scholarly journals SPATIAL VARIABILITY OF THE SATURATED HYDRAULIC CONDUCTIVITY OF SOIL IN COCOA FARMING IN RECÔNCAVO BAIANO

2019 ◽  
Vol 32 (3) ◽  
pp. 786-794
Author(s):  
GERLANGE SOARES DA SILVA ◽  
JUCICLÉIA SOARES DA SILVA ◽  
FRANCISCO ADRIANO DE CARVALHO PEREIRA ◽  
RODRIGO ALMEIDA SANTANA ◽  
RAFAEL SILVA FIRMO ◽  
...  
Keyword(s):  
Hydraulic Conductivity ◽  
Spatial Variability ◽  
Irrigation Management ◽  
Gaussian Model ◽  
Constant Load ◽  
Saturated Hydraulic Conductivity ◽  
Limiting Factor ◽  
Site Management ◽  
Data Set ◽  
Different Depths

ABSTRACT Irrigated cocoa cultivation opened the way for production in Coastal Tablelands soils. However, in this region, the cohesive layer formed near the surface can be a limiting factor for production. The knowledge of physical soil water attributes enables the efficient irrigation management of cohesive soils. This study characterized and modeled the spatial variability of saturated hydraulic conductivity (K0) in a Distrocoeso Oxisoil of the Recôncavo Baiano Coastal Tablelands. The soil sampling was performed as undeformed structures from 50 spaced points in an 8.0 to 8.0 m area, at three different depths in the experimental area of the Federal University of Bahia Recôncavo in the Cruz das Almas-BA cultivated with cocoa (‘CCN 51’). In the laboratory, K0 was determined by permeameter method constant load, and the pore size distribution was determined using the voltage table and the soil density (Ds). Data were analyzed using descriptive statistics and geostatistics. On average, the K0 values were 40.41, 26.49, and 37.82 mm-1 h-1 at the depths from 0.0-0.15 m, 0.15-0.30, and 0.30-0.45 m. The Gaussian model was the best fit to the K0 data set. For soil class, the K0 showed a strong spatial dependence due to their relationship with the physical properties of the soil, its use, and handling. Since an important attribute for the delimitation of homogeneous areas for specific site management purposes as well be considered.

Spatial variability of saturated hydraulic conductivity at the hillslope scale: Understanding the role of land management and erosional effect

Geoderma ◽  
2015 ◽  
Vol 243-244 ◽  
pp. 58-68 ◽  
Author(s):  
Athanasios (Thanos) N. Papanicolaou ◽  
Mohamed Elhakeem ◽  
Christopher G. Wilson ◽  
C. Lee Burras ◽  
Larry T. West ◽  
...  
Keyword(s):  
Hydraulic Conductivity ◽  
Spatial Variability ◽  
Land Management ◽  
Saturated Hydraulic Conductivity ◽  
Hillslope Scale

scholarly journals Development and testing of a large, transportable rainfall simulator for plot-scale runoff and parameter estimation

2014 ◽  
Vol 18 (10) ◽  
pp. 4169-4183 ◽  
Author(s):  
T. G. Wilson ◽  
C. Cortis ◽  
N. Montaldo ◽  
J. D. Albertson
Keyword(s):  
Hydraulic Conductivity ◽  
Overland Flow ◽  
Field Tests ◽  
Soil Surface ◽  
Saturated Hydraulic Conductivity ◽  
Water Retention Curve ◽  
Soil Water Retention Curve ◽  
Soil Water Retention ◽  
Variable Intensity ◽  
Rainfall Simulator

Abstract. There is increased interest in the interplay between vegetation conditions and overland flow generation. The literature is unclear on this relationship, and there is little quantitative guidance for modeling efforts. Therefore, experimental efforts are needed, and these call for a lightweight transportable plot-scale (>10 m2) rainfall simulator that can be deployed quickly and quickly redeployed over various vegetation cover conditions. Accordingly, a variable-intensity rainfall simulator and collection system was designed and tested in the laboratory and in the field. The system was tested with three configurations of common pressure washing nozzles producing rainfall intensities of 62, 43, and 32 mm h-1 with uniformity coefficients of 76, 65, and 62%, respectively, over a plot of 15.12 m2. Field tests were carried out on a grassy field with silt–loam soil in Orroli, Sardinia, in July and August 2010, and rainfall, soil moisture, and runoff data were collected. The two-term Philip infiltration model was used to find optimal values for the saturated hydraulic conductivity of the soil surface and bulk soil, soil water retention curve slope, and air entry suction head. Optimized hydraulic conductivity values were similar to both the measured final infiltration rate and literature values for saturated hydraulic conductivity. This inexpensive (less than USD 1000) rainfall simulator can therefore be used to identify field parameters needed for hydrologic modeling.

Recovery of saturated hydraulic conductivity along a forest successional series from abandoned land to mature, evergreen broad-leaved forest in eastern China

Soil Research ◽  
2012 ◽  
Vol 50 (4) ◽  
pp. 257 ◽  
Author(s):  
Shun Lei Peng ◽  
Jian Wu ◽  
Wen Hui You
Keyword(s):  
Hydraulic Conductivity ◽  
Overland Flow ◽  
Eastern China ◽  
Coniferous Forest ◽  
Saturated Hydraulic Conductivity ◽  
Broad Leaved Forest ◽  
Abandoned Land ◽  
Successional Series ◽  
Successional Stages ◽  
Leaved Forest

Saturated hydraulic conductivity (Ks) can be used to indicate changes in soil hydrology resulting from vegetation succession. A constant-head permeameter was used to investigate differences in Ks at five soil depths (10, 20, 40, 60, and 80 cm) along a successional sequence of 155 years in evergreen broad-leaved forest at Tiantong National Forest Park, eastern China. The following six forest successional classes were studied: climax evergreen broad-leaved forest (CE), sub-climax evergreen broad-leaved forest (SE), evergreen broad-leaved mixed coniferous forest (MF), coniferous forest (CF), secondary shrub (SS), and abandoned land (AL). Surface Ks (the geometric mean of Ks at 10 and 20 cm soil depths) significantly increased from AL to CE but declined in CF. The surface Ks value under CE was higher than under other successional stages (CE 271 mm h–1, AL 58 mm h–1, SS 124 mm h–1, CF 90 mm h–1, MF 170 mm h–1, SE 231 mm h–1), and was 4.7 times greater than under AL, 2.2 times greater than under SS, and 3.0 times greater than under CF, but showed no significant difference from SE (P > 0.05). Vertical difference of Ks was detected up to a soil depth of 40 cm along forest successional series. Macroporosity was the main determining factor and played an important role in the process of Ks recovery. The likelihood of overland flow generation was inferred by comparing Ks at soil depths of 10, 20, 40, and 60 cm under the various successional stages at prevailing storm intensities. Overland flow was most likely to occur in the early successional stages. This study suggests that Ks could be restored to climax forest levels along forest successional series, but the recovery time could be as long as 95 years.

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