Structured Application of the Two-Point Method for the Estimation of Infiltration Parameters in Surface Irrigation

Estimation of infiltration parameters is very difficult in furrow irrigation while they have very important effect in design and evaluation of surface irrigation systems. There are different methods for estimating infiltration parameters based on mathematical models such as SIPAR_ID model. SIPAR_ID model uses inverse solution to estimation of infiltration parameters and manning roughness. The objective of this study is to evaluate these models to estimate infiltration parameters in furrow irrigation. The study consisted of field experiments and numerical simulation. Field experiments were conducted in Zarand district of Iran in April 2012. Infiltration parameters and Manning roughness values were estimated with SIPAR_ID software. The estimated values were put into the WinSRFR software, and then the advance trajectory, flow depths in the upstream, and irrigation performance were simulated on each test furrow. The results showed that the simulated values with the WinSRFR software were in excellent agreement with the measured data. Therefore, the infiltration parameters and manning roughness estimated with SIPAR_ID software were reliable. Also that adequate and efficient irrigation can be obtained using closed-end furrows through a proper selection of inflow discharge and cutoff time.DOI: http://dx.doi.org/10.3126/ijls.v9i5.12700

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Estimation of Infiltration Parameters and the Irrigation Coefficients with the Surface Irrigation Advance Distance

PLoS ONE ◽

10.1371/journal.pone.0101274 ◽

2014 ◽

Vol 9 (7) ◽

pp. e101274

Author(s):

Zhou Beibei ◽

Wang Quanjiu ◽

Tan Shuai

Keyword(s):

Surface Irrigation ◽

Infiltration Parameters

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Investigating the midpoint of a two‐point method for predicting advance and infiltration in surface irrigation *

Irrigation and Drainage ◽

10.1002/ird.2618 ◽

2021 ◽

Author(s):

Amir Panahi ◽

Amin Seyedzadeh ◽

Eisa Maroufpoor

Keyword(s):

Point Method ◽

Surface Irrigation

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Scanning Electron Microscopy of Dried and Acid Treated Shells of Difflugia

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s042482010007268x ◽

1973 ◽

Vol 31 ◽

pp. 448-449

Author(s):

Barry S. Eckert ◽

S. M. McGee-Russell

Keyword(s):

Electron Microscopy ◽

Scanning Electron Microscopy ◽

Critical Point ◽

Point Method ◽

External Structure ◽

Cell Locomotion ◽

Single Opening ◽

Scanning Electron

Difflugia lobostoma is a shelled amoeba. The shell is an external structure of considerable mass which presents the animal with special restrictions in cell locomotion which are met by the development of active pseudopodial lobopodia containing, apparently, an organized system of thick and thin microfilaments (Eckert and McGee-Russell, 1972). The shell is constructed of sand grains picked up from the environment, and cemented into place with a secretion. There is a single opening through which lobopods extend. The organization of the shell was studied by scanning electron microscopy (SEM).Intact shells or animals with shells were dried by the critical point method of Anderson (1966) or air dried, after primary fixation in glutaraldehyde.

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