Water mass balance in the case of vertical infiltration

Water movement in the unsaturated zone is an important hydrological process. Richard’s equation is windily used to describe both soil water infiltration and soil water absorption. Various methods have been developed to solve Richard’s equation. Wang et al. (2003) have developed an algebraic model for the description of soil water infiltration, based on Parlange’s solution of Richard’s equation and on soil retention curve and hydraulic conductivity equation given by Brooks and Corey. Their model utilizes experimental measurements of the cumulative infiltration volume and the wetting front distance as functions of time in order to describe soil water infiltration. The objective of this paper is to test the accuracy of the Wang et al. algebraic model for the one-dimensional (vertical) soil water infiltration. A vertical infiltration experiment was conducted on a sandy soil, for the measurement of the cumulative infiltration volume and the wetting front distance. Soil water content was determined at selected times and positions, using gamma ray absorption. Additionally the hydraulic conductivity K(θ) and the soil retention curve Ψ(θ) were determined. The algebraic model developed by Wang et al., was found simple to use since the required data are the cumulative infiltration (F), the wetting front distance (zf) and the initial and saturated soil water content (θi and θs respectively). The results show a fair agreement between calculated and measured values on soil water content profiles, hydraulic conductivity and on the water mass balance.

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Wetting Body Characteristics and Infiltration Model of Film Hole Irrigation

Water ◽

10.3390/w12051226 ◽

2020 ◽

Vol 12 (5) ◽

pp. 1226

Author(s):

Fei-long Jie ◽

Liang-jun Fei ◽

Yun Zhong ◽

Li-hua Liu ◽

Shou-xuan Kang

Keyword(s):

Water Content ◽

Soil Water ◽

Soil Water Content ◽

Geometric Mean ◽

Silt Loam ◽

Wetting Front ◽

Equivalent Radius ◽

Volume Model ◽

Cumulative Infiltration ◽

Irrigation Volume

Film hole irrigation is a relatively low cost and high efficiency irrigation method, which can significantly improve the efficiency of agricultural water use. In order to establish the quantitative model of film hole irrigation between cumulative infiltration and the wetting body and the irrigation volume model of crops, the infiltration process and wetting body characteristics of four different soils (Xi’an silt loam, silt, silt loam and loam) were studied in laboratory experiments and numerical HYDRUS simulation experiments. The relationship between cumulative infiltration and wetting body radius was established using a mathematical method, and a crop irrigation volume model was proposed based on the root distribution and the required water content of different crops. The experimental results showed that the shape of the wetting body of film hole irrigation is approximately half of the rotating ellipsoid, and the curve shape of the wetting front can be expressed using an elliptic equation. From the center of the film hole to the surface of the wetting front, the soil water content of the wetting body gradually decreases, and the change rate of water content gradually increases, reaching its maximum value near the wetting front. Furthermore, the distribution of water content in the wetting body can be accurately expressed using an elliptic curve equation. The cumulative infiltration of film hole irrigation is proportional to the third power of the equivalent radius of the wetting body, and the equivalent radius is equal to the geometric mean of the horizontal and vertical migration distances of the wetting front. In addition, based on the distribution of crop roots and the demand of crop roots on soil water content, the irrigation model of crops was established. This study provides a theoretical basis for the calculation of the irrigation volume for film hole irrigation under the condition of experiment, and has a guiding significance for the field experiment and application of film hole irrigation in different crops in future.

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DETERMINAÇÃO EXPERIMENTAL DA DIMENSÃO FRACTAL DO MOVIMENTO DA ÁGUA NO SOLO EM FLUXOS HORIZONTAIS

Irriga ◽

10.15809/irriga.1998v3n2p48-55 ◽

1998 ◽

Vol 3 (2) ◽

pp. 48-55

Author(s):

Edivania Dos Santos ◽

Irae Amaral Guerrini

Keyword(s):

Water Content ◽

Soil Water ◽

Soil Water Content ◽

Water Pressure ◽

Full Range ◽

Weibull Model ◽

Water Infiltration ◽

Soil Water Infiltration ◽

De Se

DETERMINAÇÃO EXPERIMENTAL DA DIMENSÃO FRACTAL DO MOVIMENTO DA ÁGUA NO SOLO EM FLUXOS HORIZONTAIS Edivânia dos Santos Departamento de Engenharia Rural - FCA - UNESPCaixa Postal 237 – CEP 18603-970 – Botucatu – SP Ivan Amaral GuerriniDepartamento de Física e Biofísica - IB – UNESP - Botucatu 1 RESUMO Em busca de novas tecnologias para produção agrícola, muitos esforços tem sido feitos no intuito de se conhecer importantes fenômenos da natureza como os que envolvem água, solo e planta.O movimento da água no solo como um processo de difusão pode ser visualizado também como um fenômeno fractal, associando o expoente n da equação x = l . t n ao expoente de Hurst e caracterizando o fenômeno como Movimento Browniano fracionário.Este trabalho estudou a relação da posição em relação ao tempo para todo o espectro de umidade do solo durante o fenômeno de infiltração da água no solo, em colunas horizontais, em laboratório, com pressão de entrada da água ao nível zero, utilizando a equação acima .Para a medição da umidade utilizou-se a técnica da atenuação da radiação gama, sendo que os ajustes dos dados de umidade em função do tempo foram feitos pelo modelo Weibull. UNITERMOS : Fractal, água no solo, infiltração. SANTOS dos, E., GUERRINI, I. A. Experimental determination of the fractal dimension of the soil-water content in the horizontal flux. 2 ABSTRACT Searching for new tecnologies for agricultural production many efforts has been made to know important phenomena in nature involve water, soil and plant.The moviment soil-water how as a diffusion process can be visualized, as a fractal phenomenon, associating the exponente n of equation x = l . t n to the Hurst exponent and caracterizing the phenomenon as a Bronwnian Fractional Motion.This paper studied the relation betwen the position and the time, for the full range water contents during soil-water infiltration, in horizontal columns, in the laboratory with water pressure entrance, utilizing the above equation. To measure soil water content the radiation gamma attenuation, was utilized the water content transients were fitted by the Weibull model. KEI-WORDS: Fractal, soil-water and infiltration.

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Comparative study of the impact of two mechanical perforation densities on the behavior of a sandy soil

Progress in Agricultural Engineering Sciences ◽

10.1556/progress.8.2012.2 ◽

2012 ◽

Vol 8 (1) ◽

pp. 37-48

Author(s):

S. Chehaibi ◽

K. Abrougui ◽

F. Haouala

Keyword(s):

Soil Water ◽

Sandy Soil ◽

Water Infiltration ◽

Cone Penetration ◽

Initial State ◽

Soil Water Infiltration ◽

Good Improvement ◽

The Impact ◽

Positive Effect ◽

Resistance To Penetration

The effects of mechanical perforation densities by extracting soil cores through an aerator Vertidrain with a working width of 1.6 m and equipped with hollow tines spaced of 65 mm, were studied on a sandy soil of a grassy sward in the Golf Course El Kantaoui in Sousse (Tunisia). The mechanical aeration was performed at two densities: 250 and 350 holes/m2. The cone penetration resistance and soil water infiltration were measured. These parameters were performed at initial state before aeration (E0) and then on the 10th, 20th and 30th day after aeration. These results showed that perforation density of 350 holes/m2 had a positive effect on the soil by reducing its cone resistance to penetration compared to the initial state (Rp = 14.8 daN/cm2). At 5 cm depth the decrease in resistance to penetration was 34% and 43% on the 10th and 20th day after aeration, respectively. However, on the 30th day after aeration the soil resistance to penetration tended to grow and its value compared to the initial state decreased only by 21 and 26%, respectively, at 5 and 15 cm of depth only by 10% and 9% with 250 holes/m2 density. The soil water infiltration made a good improvement after aeration compared to the initial state. This parameter increased from 4.8 cm/h to 8.3, 10.9 and 13.1 cm/h with 250 holes/m2 density and to 10, 12.9 and 14.8 cm/h with 350 holes/m2 density on the 10th, 20th and 30th day following the aeration.

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Soil water infiltration after oilseed crop introduction into a Pacific Northwest winter wheat–fallow rotation

Journal of Soil and Water Conservation ◽

10.2489/jswc.2020.00165 ◽

2020 ◽

Vol 75 (6) ◽

pp. 739-745

Author(s):

J.D. Williams ◽

C. Reardon ◽

S.B. Wuest ◽

D.S. Long

Keyword(s):

Winter Wheat ◽

Soil Water ◽

Pacific Northwest ◽

Water Infiltration ◽

Oilseed Crop ◽

Soil Water Infiltration

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Effects of White Grubs on Soil Water Infiltration

Neotropical Entomology ◽

10.1007/s13744-015-0273-x ◽

2015 ◽

Vol 44 (2) ◽

pp. 134-139 ◽

Cited By ~ 2

Author(s):

A A Romero-López ◽

E Rodríguez-Palacios ◽

E Alarcón-Gutiérrez ◽

D Geissert ◽

I Barois

Keyword(s):

Soil Water ◽

Water Infiltration ◽

White Grubs ◽

Soil Water Infiltration

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Observation and modeling on irregular purple soil water infiltration process

Journal of Mountain Science ◽

10.1007/s11629-015-3737-x ◽

2017 ◽

Vol 14 (6) ◽

pp. 1076-1085 ◽

Cited By ~ 3

Author(s):

Dong-bing Cheng ◽

Lin-yao Dong ◽

Feng Qian ◽

Bei Sun

Keyword(s):

Soil Water ◽

Water Infiltration ◽

Purple Soil ◽

Infiltration Process ◽

Soil Water Infiltration

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Effects of hillslope position on soil water infiltration and preferential flow in tropical forest in southwest China

Journal of Environmental Management ◽

10.1016/j.jenvman.2021.113672 ◽

2021 ◽

Vol 299 ◽

pp. 113672

Author(s):

Chunfeng Chen ◽

Xin Zou ◽

Ashutosh Kumar Singh ◽

Xiai Zhu ◽

Wanjun Zhang ◽

...

Keyword(s):

Tropical Forest ◽

Soil Water ◽

Preferential Flow ◽

Southwest China ◽

Water Infiltration ◽

Soil Water Infiltration

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Effects of textural layering on water regimes in sandy soils in a desert-oasis ecotone, Northwestern China

10.5194/egusphere-egu21-9324 ◽

2021 ◽

Author(s):

Chengpeng Sun ◽

Wenzhi Zhao ◽

Hu Liu ◽

Yongyong Zhang ◽

Hong Zhou

Keyword(s):

Water Content ◽

Soil Water ◽

Soil Water Content ◽

Water Infiltration ◽

Northwestern China ◽

Soil Profiles ◽

Burial Depth ◽

Layered Soils ◽

Water Regimes ◽

Desert Oasis

Textural layering of soil plays an important role in distributing and regulating resources for plants in many semiarid and arid landscapes. However, the spatial patterns of textural layering and the potential effects on soil hydrology and water regimes are poorly understood, especially in arid sandy soil environments like the desert-oasis ecotones in northwestern China. This work aims to determine the distribution of textural layered soils, analyze the effects of different soil-textural configurations on water regimes, and evaluate which factors affect soil water infiltration and retention characteristics in such a desert-oasis ecotone. We measured soil water content and mineral composition in 87 soil profiles distributed along 3 transects in the study area. Constant-head infiltration experiments were conducted at 9 of the soil profiles with different texture configurations. The results showed that textural layered soils were patchily but extensively distributed throughout the study area (with a combined surface area percentage of about 84%). Soil water content in the profiles ranged from 0.002 to 0.27 g/cm3 during the investigation period, and significantly and positively correlated with the thickness of a medium-textured (silt or silt loam) layer (P < 0.001). The occurrence of a medium-textured layer increased field capacity (FC) and wilting point (WP), and decreased available water-holding capacity in soil profiles. Burial depth of the medium-textured layer had no clear effects on water retention properties, but the layer thickness tended to. In textural layered soils, smaller water infiltration rate and cumulative infiltration, and shallower depths of wetting fronts were detected, compared with homogeneous sand profiles. The thickness and burial depth of medium-textured layers had obvious effects on infiltration, but the magnitude of the effects depended on soil texture configuration. The revealed patterns of soil textural layering and the potential effects on water regimes may provide new insight into the sustainable management of rainfed vegetation in the desert-oasis ecotones of arid northwestern China and other regions with similar environments around the world.

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Effect of Nano-Carbon on Water Holding Capacity in a Sandy Soil of the Loess Plateau

Earth Sciences Research Journal ◽

10.15446/esrj.v21n4.66104 ◽

2017 ◽

Vol 21 (4) ◽

pp. 189-195 ◽

Cited By ~ 2

Author(s):

Beibei Zhou ◽

Xiaopeng Chen

Keyword(s):

Water Content ◽

Soil Water ◽

Loess Plateau ◽

Sandy Soil ◽

Water Retention ◽

Soil Mixture ◽

Cumulative Infiltration ◽

Nano Carbon ◽

Water Contents ◽

Soil Water Contents

The poor water retention capacity of sandy soils commonly aggregate soil erosion and ecological environment on the Chinese Loess Plateau. Due to its strong capacity for absorption and large specific surface area, the use of nanocarbon made of coconut shell as a soil amendment that could improve water retention was investigated. Soil column experiments were conducted in which a layer of nanocarbon mixed well with the soil was formed at a depth of 20 cm below the soil surface. Four different nanocarbon contents by weight (0%, 0.1%, 0.5%, and 1%) and five thicknesses of the nanocarbon- soil mixture layer ranging from 1 to 5 cm were considered. Cumulative infiltration and soil water content distributions were determined when water was added to soil columns. Soil Water Characteristic Curves (SWCC) were obtained using the centrifuge method. The principal results showed that the infiltration rate and cumulative infiltration increased with the increases of nanocarbon contents, to the thicknesses of the nano carbon-soil mixture layer. Soil water contents that below the soil-nano carbon layer decreased sharply. Both the Brooks-Corey and van Genuchten models could describe well the SWCC of the disturbed sandy soil with various nano carbon contents. Both the saturated water content (θs), residual water content (θr) and empirical parameter (α) increased with increasing nano carbon content, while the pore-size distribution parameter (n) decreased. The available soil water contents were efficiently increased with the increase in nanocarbon contents.

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