Hydraulic conductivity measurements of the spatial variability of a loamy soil

Vauclin, Michel; Elrick, D. E.; Thony, J.L.; Vachaud, G.; Revol, Ph.; Ruelle, Pierre

doi:10.1016/0933-3630(94)90020-5

Cited by 46 publications

(38 citation statements)

References 25 publications

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“…The simulated h c values were obtained from Raats' [1971] steady state theory for 32 points in the field. The hydraulic conductivity parameters K s and a were measured by the Guelph pressure infiltrometer [Vauclin et al, 1994]. The h c values were measured at the same locations du.…”

Section: Resultsmentioning

confidence: 99%

Infiltration from a surface point source and drip irrigation: 1. The midpoint soil water pressure

Revol¹,

Vauclin²,

Vachaud³

et al. 1997

Water Resources Research

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Abstract. Bresler [1978] proposed a procedure for drip irrigation design which is focused on the midpoint soil water pressure hc. We present a practical field test of this approach in order to evaluate the validity of the underlying assumptions. The simulated h c values were obtained from Raats' [1971] steady state theory for 32 points in the field where the hydraulic conductivity parameters K s and a were measured. The h c values were measured at the same locations during microirrigation of a maize crop. Measured hc's appear to be lower than the simulated ones, especially late in the season. The measured spatial variability in h c appeared to be higher than the simulated ones. This could well have been caused by root uptake activity, which is not considered in the analysis, as well as by the large but typical drippers spacing of d = 1.00 m. Thus the tensiometers could have been beyond the practical limit of wetting. Consequences for design and management are important. For design, even if a high h c value is chosen, there is no real guarantee that the wetting would be effective at the midpoint. For irrigation management, tensiometer placement too far from the dripper would lead to overirrigation, so for a large dripper spacing d, the midpoint placement is not judicious. IntroductionIt is well known that drip irrigation efficiency is critically dependent upon the soil's hydraulic properties. Nowadays, with increasing environmental concerns about water use and the recent development of new devices for measuring the soil's hydraulic properties, there is a requirement and opportunity to consider better the soil's properties in designing and operating drip irrigation systems. In this series of two papers we examine how the theory of point source infiltration can help in this task. This first paper deals with the soil water pressure at the point midway between drippers. The second paper IRevol et al.

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Section: Resultsmentioning

confidence: 99%

Infiltration from a surface point source and drip irrigation: 1. The midpoint soil water pressure

Revol¹,

Vauclin²,

Vachaud³

et al. 1997

Water Resources Research

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“…According to Nielsen et al (1973) and Vauclin et al (1994), the saturated hydraulic conductivity is widely affected by the spatial soil variability. Therefore, we can assume that K s values presented in tables (2a) and (2b) are virtually of the same order of magnitude.…”

Section: Infiltramentioning

confidence: 99%

Analysis of Saturation Risk in Sprinkler Irrigation: Case of Cherfech Irrigation Perimeter in Tunisia

Yacoubi¹,

Slatni²,

Zayani³

2018

JAS

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This study is targeted to the assessment of the saturation risk in sprinkler irrigation. For this purpose, in situ field trials were carried out to infer the saturated hydraulic conductivity (K s ) and sorptivity (S) using the disc infiltrometer method. Since the measured values of K s are very close to prescribed application rate, caution is required. In a first step, the pressure head at the wetting front (h f ) and the useful porosity (θ s -θ i ) are assumed to be constant. Thus, the logarithmic derivation of the sorptivity provides a relation between relative variations of S and K s . The ponding time (T s ) is estimated from Green and Ampt (1911) and Philip (1957b) infiltration equations. The risk of saturation is deemed to be inexistent inasmuch as simulated values of T s are greater than the irrigation times practiced in the zone. In a second step, the values of the pressure head at the wetting front and saturated water content were assumed to be variable with soil texture. Simulations of the ponding time were carried out based on Rawls and al. (1981) data. For the recommended sprinkler spacing in the Cherfech perimeter (12 m × 12 m), the simulations show a good agreement between T s values generated from Green and Ampt and Philip equations for K s ranging from 1.5 to 6 mm/h. Moreover, it was established that saturation risk due to a gradual texture variation is virtually inexistent in the conditions prevailing in Cherfech perimeter.

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“…For constant head procedures see Elrick and Reynolds (1992) and Vauclin et al (1994). For falling head procedures see Elrick et al (1995Elrick et al ( , 2002.…”

Section: Detailed Research Investigationsmentioning

confidence: 99%

Measuring Water Transmission Parameters in Vadose Zone Using Ponded Infiltration Techniques

Elrick

Reynolds

2002

Jour. Agri. & Mar. Scie.

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The flow of soil water is characterized by water transmission parameters, field-saturated hydraulic conductivity, matric flux potential and sorptivity. Soil water flow is, in turn, the primary mechanism by which soil contaminants, such as excess plant nutrient, bacteria, viruses, salts, and industrial chemicals are transported. Consequently, knowledge of soil water transmission parameters is essential for understanding, preventing and remediating the contamination of soil water and ground water. This paper describes steady-state and transient methods for obtaining soil water transmission parameters from ponded infiltration under constant head and falling head conditions in surface rings and shallow auger holes. Also discussed are the conditions under which the various methods are most appropriate.

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Hydraulic conductivity measurements of the spatial variability of a loamy soil

Cited by 46 publications

References 25 publications

Infiltration from a surface point source and drip irrigation: 1. The midpoint soil water pressure

Infiltration from a surface point source and drip irrigation: 1. The midpoint soil water pressure

Analysis of Saturation Risk in Sprinkler Irrigation: Case of Cherfech Irrigation Perimeter in Tunisia

Measuring Water Transmission Parameters in Vadose Zone Using Ponded Infiltration Techniques

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