Development and application of a conceptual hydrologic model to predict soil salinity within modern Tunisian oases

Askri, Brahim; Bouhlila, Rachida; Job, Jean Olivier

doi:10.1016/j.jhydrol.2009.10.022

Cited by 53 publications

(22 citation statements)

References 27 publications

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“…As it is necessary to make experiment to determine the stable storage in root zone (W s ) (Liu and luo 2012), it is difficult to obtain the values of W s for different soils in the study area. Therefore, according to Askri et al (2010), in the equation of estimating ET gw (Liu and luo 2012), W s was replaced with the water storage corresponding to wilting point (W wp ) at which plants will permanently wilt. Table 3 shows the irrigation amounts and dates of three scenarios.…”

Section: Parametersmentioning

confidence: 99%

Simulation of groundwater evaporation and groundwater depth using SWAT in the irrigation district with shallow water table

Liu

Luo

et al. 2015

Environ Earth Sci

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In irrigation districts with shallow water table, groundwater evaporation (ET gw ) and groundwater depth are important variables for the study of water balance. These variables are influenced by natural factors and human activity. In this study, a new method of simulating ET gw was used for SWAT, and the computing and output modules of groundwater depth were established. In addition, based on simulations, we analyzed the influences of irrigation schedules and soil types on ET gw and groundwater depth in the Irrigation Districts along the Lower Reach of Yellow River Basin. The applicabilities of the three methods (Hargreaves, Priestley-Taylor and PenmanMonteith) simulating potential evapotranspiration in SWAT 2000 were evaluated by the measured groundwater evaporation, and Hargreaves was applied in the simulation for irrigation district due to its smallest simulation error. The results presented that the mean groundwater depth decreased with the increase of irrigation amount. However, the changes of soil water storage in root zone and groundwater depth might have more complex effects on the variation of the mean groundwater evaporation. Loamy sand had the smallest annual mean groundwater depth and mean annual ET gw in the study area, while silt loam corresponded to the largest groundwater depth and groundwater evaporation. This study provides a new method for making simulations and analyses of the hydrological cycle in irrigation districts which has a shallow water table.

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Section: Parametersmentioning

confidence: 99%

Simulation of groundwater evaporation and groundwater depth using SWAT in the irrigation district with shallow water table

Liu

Luo

et al. 2015

Environ Earth Sci

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“…Thus, the two stressors are not directly comparable. Nonetheless, in the field salinity usually changes more gradually than soil water content because salt from rising ground water or irrigation accumulates gradually over weeks or months (Askri et al 2010), whereas soil water content may change within a few hours or days (Griffiths et al 2003). Thus, although the experimental design is not ideal to compare the effect of osmotic and matric stress on soil microorganisms, it does reflect the situation in the field.…”

Section: Hypothesismentioning

confidence: 99%

Response of microbial activity and community structure to decreasing soil osmotic and matric potential

2011

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Low soil water content (low matric potential) and salinity (low osmotic potential) occur frequently in soils, particularly in arid and semi-arid regions. Although the effect of low matric or low osmotic potential on soil microorganisms have been studied before, this is the first report which compares the effect of the two stresses on microbial activity and community structure. A sand and a sandy loam, differing in pore size distribution, nutrient content and microbial biomass and community structure, were used. For the osmotic stress experiment, salt (NaCl) was added to achieve osmotic potentials from −0.99 to −13.13 MPa (sand) and from −0.21 to 3.41 MPa (sandy loam) after which the soils were pre-incubated at optimal water content for 10d. For the matric stress experiment, soils were also preincubated at optimal water content for 10d, after which the water content was adjusted to give matric potentials from −0.03 and −1.68 MPa (sand) and from −0.10 to 1.46 MPa (sandy loam). After amendment with 2% (w/w) pea straw (C/N 26), soil respiration was measured over 14d. Osmotic potential decreased with decreasing soil water content, particularly in the sand. Soil respiration decreased with decreasing water potential (osmotic+matric). At a given water potential, respiration decreased to a greater extent in the matric stress experiment than in the osmotic stress experiment. Decreasing osmotic and matric potential reduced microbial biomass (sum of phospholipid fatty acids measured after 14 days) and changed microbial community structure: fungi were less tolerant to decreasing osmotic potential than bacteria, but more tolerant to decreasing water content. It is concluded that low matric potential may be more detrimental than a corresponding low osmotic potential at optimal soil water content. This is likely to be a consequence of the restricted diffusion of substrates and thus a reduced ability of the microbes to synthesise osmolytes to help maintain cell water content. The study also highlighted that it needs to be considered that decreasing soil water content concentrates the salts, hence microorganisms in dry soils are exposed to two stressors.

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“…A total of 11892 water level readings were obtained. (Askri et al, 2010). In our observation site, at least 15 major recharge events were observed, corresponding to: (i) three major rainfall periods occurring in April (10 mm), May (7 mm) and September (37 mm), (ii) the inflow from the surrounding intensively irrigated areas (irrigation is occurring daily in Metouia Oasis) and (iii) the two onsite irrigation events in October and November 2009.…”

Section: Shallow Groundwater Monitoring Systemmentioning

confidence: 87%

A high measurement frequency based assessment of shallow groundwater fluctuations in Metouia Oasis, South Tunisia

Ibrahimi

Miyazaki

Nishimura

2010

Hydrological Research Letters

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Abstract:The Metouia Oasis (South Tunisia) is increasingly being impacted by high soil salinity, leading to yield losses and ultimately to farmland abandon. In this area shallow groundwater rise is considered the major factor responsible for salt accumulation in soils. However, limited data exist on groundwater fluctuations in Metouia Oasis, despite the criticality of such information for accurate soil salinity assessment. In this study, groundwater behavior was monitored at a high measurement frequency. An observation well was installed and equipped with a water level sensor (Diver DI240, Van Essen Instrument) to record the groundwater fluctuation at 30 minute intervals. The results showed that at seasonal basis, groundwater was characterized by a declining phase during spring and summer seasons followed by a rising phase starting from mid-October. Further, the hydrograph was characterized by several rapid water table rises following recharge events followed by extended periods of water table decline. The hourly observations at daily basis displayed strong evidence of diurnal effects on groundwater patterns. The results from this study suggest that consideration should be given to monitoring water table behavior in Metouia Oasis more frequently in order to capture daily and seasonal patterns.

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Development and application of a conceptual hydrologic model to predict soil salinity within modern Tunisian oases

Cited by 53 publications

References 27 publications

Simulation of groundwater evaporation and groundwater depth using SWAT in the irrigation district with shallow water table

Simulation of groundwater evaporation and groundwater depth using SWAT in the irrigation district with shallow water table

Response of microbial activity and community structure to decreasing soil osmotic and matric potential

A high measurement frequency based assessment of shallow groundwater fluctuations in Metouia Oasis, South Tunisia

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