Reply [to “Comment on ‘Influence of three-parameter conversion methods between van Genuchten and Brooks-Corey Functions on soil hydraulic properties and water-balance predictions’ by Qingli Ma et al.”]

2001 ◽  
Vol 37 (3) ◽  
pp. 853-855 ◽  
Author(s):  
Qingli Ma ◽  
James E. Hook ◽  
Laj R. Ahuja
Keyword(s):  
Water Balance ◽  
Hydraulic Properties ◽  
Soil Hydraulic Properties ◽  
Parameter Conversion ◽  
Soil Hydraulic

Simulating infiltration and the water balance in cropping systems with APSIM-SWIM

Soil Research ◽  
2002 ◽  
Vol 40 (2) ◽  
pp. 221 ◽  
Author(s):  
R. D. Connolly ◽  
M. Bell ◽  
N. Huth ◽  
D. M. Freebairn ◽  
G. Thomas
Keyword(s):  
Water Balance ◽  
Soil Water ◽  
Hydraulic Properties ◽  
Cropping Systems ◽  
Soil Condition ◽  
Crop Growth ◽  
Soil Hydraulic Properties ◽  
Crop Models ◽  
Soil Hydraulic ◽  
Parameter Values

We test APSIM-SWIM's ability to simulate infiltration and interactions between the soil water balance and grain crop growth using soil hydraulic properties derived from independent, point measurements. APSIMSWIM is a continuous soil-crop model that simulates infiltration, surface crusting, and soil condition in more detail than most other soil-crop models. Runoff, soil water, and crop growth information measured at sites in southern Queensland was used to test the model. Parameter values were derived directly from soil hydraulic properties measured using rainfall simulators, disc permeameters and ponded rings, and pressure plate apparatus. In general, APSIM-SWIM simulated infiltration, runoff, soil water and the water balance, and yield as accurately and reliably as other soil crop models, indicating the model is suitable for evaluating effects of infiltration and soil-water relations on crop growth. Increased model detail did not hinder application, instead improving parameter transferability and utility, but improved methods of characterising crusting, soil hydraulic conductivity, and macroporosity under field conditions would improve ease of application, prediction accuracy, and reliability of the model. Model utility and accuracy would benefit from improved representation of temporal variation in soil condition, including effects of tillage and consolidation on soil condition and bypass flow in cracks. infiltration, crop models, APSIM, water balance, soil structure.

Obtaining soil hydraulic properties for water balance and leaching models from survey data. 2. Hydraulic conductivity

1999 ◽  
Vol 50 (7) ◽  
pp. 1259 ◽  
Author(s):  
K. R. J. Smettem ◽  
K. L. Bristow
Keyword(s):  
Hydraulic Conductivity ◽  
Water Balance ◽  
Survey Data ◽  
Hydraulic Properties ◽  
Regional Scale ◽  
Saturated Hydraulic Conductivity ◽  
Soil Survey ◽  
Attractive Alternative ◽  
Soil Hydraulic Properties ◽  
Soil Hydraulic

Regional scale application of water and solute transport models is often limited by the lack of available data describing soil hydraulic properties and their variability. Direct measurement over large areas is expensive and time consuming. Physico-empirical models derived from soil survey data are therefore an attractive alternative. If the Marshall method of estimating the saturated hydraulic conductivity is simplified to depend primarily on the maximum pore radius, given by the bubbling pressure, then it is equivalent to the Campbell model of saturated hydraulic conductivity which relies entirely on an estimate of the bubbling pressure obtained from particle size data. We apply this simplified physico-empirical model to estimate the ‘matrix’, or textural saturated hydraulic conductivity, K m, using estimates of the bubbling pressure derived entirely from clay content data that are readily available in soil surveys. Model estimates are compared with in situ measurements on surface soils obtained using a disc permeameter with a negative pressure head at the supply surface of 40 mm. Results appear to be satisfactory for broad-scale water balance and leaching risk models that require specification of a matching point for the unsaturated hydraulic conductivity function and for modelling applications requiring generalised application of results from experimental sites.

scholarly journals A Comparative Investigation of Various Pedotransfer Functions and Their Impact on Hydrological Simulations

Water ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 1401
Author(s):  
Hadis Mohajerani ◽  
Sonja Teschemacher ◽  
Markus C. Casper
Keyword(s):  
Hydraulic Conductivity ◽  
Water Balance ◽  
Hydraulic Properties ◽  
Hydrological Model ◽  
Pedotransfer Functions ◽  
Balance Model ◽  
Baseline Scenario ◽  
Calibration Data ◽  
Soil Hydraulic Properties ◽  
Soil Hydraulic

Soil hydraulic properties, which are basically saturated and unsaturated hydraulic conductivity and water retention characteristics, remarkably control the main hydrological processes in catchments. Thus, adequate parameterization of soils is one of the most important tasks in physically based catchment modeling. To estimate these properties, the choice of the PTFs in a hydrological model is often made without taking the runoff characteristics of the catchment into consideration. Therefore, this study introduces a methodology to analyze the sensitivity of a catchment water balance model to the choice of the PTF. To do so, we define 11 scenarios including different combinations of PTFs to estimate the van Genuchten parameters and saturated hydraulic conductivity. We use a calibrated/validated hydrological model (WaSiM-ETH) as a baseline scenario. By altering the underlying PTFs, the effects on the hydraulic properties are quantified. Moreover, we analyze the resulting changes in the spatial/temporal variation of the total runoff and in particular, the runoff components at the catchment outlet. Results reveal that the water distribution in the hydrologic system varies considerably amongst different PTFs, and the water balance components are highly sensitive to the spatial structure of soil hydraulic properties. It is recommended that models be tested by careful consideration of PTFs and orienting the soil parameterization more towards representing a plausible hydrological behavior rather than focusing on matching the calibration data.

Effects of Estimating Soil Hydraulic Properties and Root Growth Factor on Soil Water Balance and Crop Production

2009 ◽  
Vol 101 (3) ◽  
pp. 572-583 ◽  
Author(s):  
Liwang Ma ◽  
Gerrit Hoogenboom ◽  
S. A. Saseendran ◽  
P. N. S. Bartling ◽  
Lajpat R. Ahuja ◽  
...  
Keyword(s):  
Growth Factor ◽  
Water Balance ◽  
Root Growth ◽  
Soil Water ◽  
Crop Production ◽  
Hydraulic Properties ◽  
Soil Water Balance ◽  
Soil Hydraulic Properties ◽  
Soil Hydraulic

A modified upward infiltration method for characterizing soil hydraulic properties

2002 ◽  
Vol 66 (1) ◽  
pp. 57 ◽  
Author(s):  
M. H. Young ◽  
A. Karagunduz ◽  
J. Šimůnek ◽  
K. D. Pennell
Keyword(s):  
Hydraulic Properties ◽  
Soil Hydraulic Properties ◽  
Soil Hydraulic ◽  
Infiltration Method
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