Improved soil moisture balance methodology for recharge estimation

Rushton, K. R.; Eilers, V. H. M.; Carter, Richard

doi:10.1016/j.jhydrol.2005.06.022

Cited by 125 publications

(98 citation statements)

References 20 publications

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“…Irrigation water salinity affects the ETa, depends on the soil physical characteristics', soil moisture and crop canopy [RUSHTON et al 2006]. Crop evapotranspiration for middle season growth stage was higher than the other growth stage which agreed with [ER--RAKI et al 2010] remote sensing estimates of ETc that compare very satisfactorily with ground measurements, since the soil evaporation and plant water stress are negligible, and wheat water requirement was higher in the vegetative and mid-season stage and shows decreasing trend toward the maturity stage [GAURAV et al 2010].…”

Section: Discussionmentioning

confidence: 99%

Wheat water use and yield under different salinity of irrigation water

Abedinpour

2017

Journal of Water and Land Development

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A field experiment was conducted for determination of crop coefficient (KC) and water stress coefficient (Ks) for wheat crop under different salinity levels, during 2015-2016. Complete randomized block design of five treatments were considered, i.e., 0.51 dS·m -1 (fresh water, FW) as a control treatment and other four saline water treatments (4, 6, 8 and 10 dS·m -1 ), for S 1 , S 2 , S 3 and S 4 with three replications. The results revealed that the water consumed by plants during the different crop growth stages follows the order of FW > S 1 > S 2 > S 3 > S 4 salinity levels. According to the obtained results, the calculated values of KC significantly differed from values released by FAO paper No 56 for the crops. The Ks values clearly differ from one stage to another because the salt accumulation in the root zone causes to reduction of total soil water potential (Ψ t ), therefore, the average values of water stress coefficient (Ks) follows this order; FW(1.0) = S 1 (1.0) > S 2 (1.0) > S 3 (0.93) > S 4 (0.82). Precise data of crop coefficient, which is required for regional scale irrigation management is lacking in developing countries. Thus, the estimated values of crop coefficient under different variables are essential to achieve the best management practice (BMP) in agriculture.

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Section: Discussionmentioning

confidence: 99%

Wheat water use and yield under different salinity of irrigation water

Abedinpour

2017

Journal of Water and Land Development

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“…The XAJ's three-layer soil moisture fluctuations are represented by the SMDs in the unit of metre. SMD is an important soil moisture indicator in hydrology, which shows the amount of water to be added to a soil profile to bring it to the field capacity (Calder et al, 1983;Rushton et al, 2006). The SMD can be expressed as the following formula (Srivastava et al, 2013b).…”

Section: Xaj Hydrological Modelmentioning

confidence: 99%

Misrepresentation and amendment of soil moisture in conceptual hydrological modelling

Zhuo

Han

2016

Journal of Hydrology

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Although many conceptual models are very effective in simulating river runoff, their soil moisture schemes are generally not realistic in comparison with the reality (i.e., getting the right answers for the wrong reasons). This study reveals two significant misrepresentations in those models through a case study using the Xinanjiang model which is representative of many well-known conceptual hydrological models. The first is the setting of the upper limit of its soil moisture at the field capacity, due to the 'holding excess runoff' concept (i.e., runoff begins on repletion of its storage to the field capacity). The second is neglect of capillary rise of water movement. A new scheme is therefore proposed to overcome those two issues. The amended model is as effective as its original form in flow modelling, but represents more logically realistic soil water processes. The purpose of the study is to enable the hydrological model to get the right answers for the right reasons. Therefore, the new model structure has a better capability in potentially assimilating soil moisture observations to enhance its real-time flood

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“…Many authors have used the original Thornthwaite and Mather's model (Alley, 1984), while others have shown that this procedure can also be applied to smaller time scale (Eaton, 1995;Swanson, 1996), modifying the original model in an effort to improve certain components of the water balance. Steenhuis and Van Der Molen (1986) and Rushton et al (2006) presented a study of the Thornthwaite's method at a daily scale.…”

Section: Introductionmentioning

confidence: 99%

General procedure to initialize the cyclic soil water balance by the Thornthwaite and Mather method

Neto¹,

Lier²,

Metselaar

et al. 2010

Sci. agric. (Piracicaba, Braz.)

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The original Thornthwaite and Mather method, proposed in 1955 to calculate a climatic monthly cyclic soil water balance, is frequently used as an iterative procedure due to its low input requirements and coherent estimates of water balance components. Using long term data sets to establish a characteristic water balance of a location, the initial soil water storage is generally assumed to be at field capacity at the end of the last month of the wet season, unless the climate is (semi-) arid when the soil water storage is lower than the soil water holding capacity. To close the water balance, several iterations might be necessary, which can be troublesome in many situations. For (semi-) arid climates with one dry season, Mendonça derived in 1958 an equation to quantify the soil water storage monthly at the end of the last month of the wet season, which avoids iteration procedures and closes the balance in one calculation. The cyclic daily water balance application is needed to obtain more accurate water balance output estimates. In this note, an equation to express the water storage for the case of the occurrence of more than one dry season per year is presented as a generalization of Mendonça's equation, also avoiding iteration procedures. Key words: actual and reference evapotranspiration, deficit and excess water Critério geral para iniciar o balanço hídrico pelo método de Thornthwaite e MatherRESUMO: O método original de Thornthwaite e Mather, proposto em 1955 para calcular o balanço hídrico semanal, é utilizado com freqüência devido à baixa exigência de dados de entrada e da obtenção de estimativas coerentes dos parâmetros do balanço. Como valor inicial para o início dos cálculos, geralmente assume-se que o armazenamento de água encontra-se na capacidade de campo ao fim do último mês da estação chuvosa. Ele será menor que a capacidade de campo em casos de climas áridos e semi-áridos. Para fechar o balanço, muitos ciclos iterativos podem ser necessários, o que pode ser complicado em muitas situações. Para climas áridos e semi-áridos com apenas uma estação seca, Mendonça desenvolveu em 1958 uma equação para quantificar o armazenamento no último mês da estação chuvosa, que permite fechar o balanço em um ciclo apenas. O balanço hídrico diário torna-se necessário para se obter estimativa de saídas mais precisas. Nessa nota, é apresentada uma rotina para expressar o armazenamento de água para o caso da ocorrência de mais de uma estação seca, uma situação que é bastante relevante quando é feito o balanço em escala diária, em regiões áridas e semi-áridas. Palavras-chave: evapotranspiração real e de referência, deficiência e excedente hídrico

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Improved soil moisture balance methodology for recharge estimation

Cited by 125 publications

References 20 publications

Wheat water use and yield under different salinity of irrigation water

Wheat water use and yield under different salinity of irrigation water

Misrepresentation and amendment of soil moisture in conceptual hydrological modelling

General procedure to initialize the cyclic soil water balance by the Thornthwaite and Mather method

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