Impacts of small hill dams on agricultural development of hilly land in the Jendouba region of northwestern Tunisia

Khlifi, Slaheddine; Ameur, Mehrez; Mtimet, Nadhem; Ghazouani, Nejla; Belhadj, Naoufel

doi:10.1016/j.agwat.2009.08.010

Cited by 17 publications

(14 citation statements)

References 7 publications

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“…Agricultural hilly watersheds are common in many parts of the world [Zhang et al, 2004;Mishra et al, 2008;Khlifi et al, 2010;Maeda et al, 2010]. They experience agricultural intensification, because hilly topographies allow water-harvesting techniques that compensate for rainfall shortage [Mekki et al, 2006;Saha et al, 2007].…”

Section: Introductionmentioning

confidence: 99%

Accounting for vegetation height and wind direction to correct eddy covariance measurements of energy fluxes over hilly crop fields

et al. 2015

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As agricultural hilly watersheds are widespread throughout the world, there is a strong need for reliable estimates of land surface fluxes, especially evapotranspiration, over crop fields on hilly slopes. In order to obtain reliable estimates from eddy covariance (EC) measurements in such conditions, the current study aimed at proposing adequate planar fit tilt corrections that account for the combined effects of topography, wind direction, and vegetation height on airflow inclinations. EC measurements were collected within an agricultural hilly watershed in northeastern Tunisia, throughout the growth cycles of cereals, legumes, and pasture. The wind had two dominant directions that induced upslope and downslope winds. For upslope winds, the airflows were parallel to the slopes and slightly came closer to the horizontal plane when vegetation grew. For downslope winds, over fields located in the lee of the rim top, the airflows were almost horizontal over bare soil and came closer to the topographical slope when vegetation grew. We therefore adjusted the planar fit tilt correction on EC measurements according to vegetation height and by discriminating between upslope and downslope winds. This adjusted tilt correction improved the energy balance closure in most cases, and the obtained energy balance closures were similar to that reported in the literature for flat conditions. We conclude that EC data collected within crop fields on hilly slopes can be used for monitoring land surface fluxes, provided planar fit tilt corrections are applied in an appropriate manner.

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Section: Introductionmentioning

confidence: 99%

Accounting for vegetation height and wind direction to correct eddy covariance measurements of energy fluxes over hilly crop fields

et al. 2015

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“…Irrigation is a solution to protect farmers from water shortages, the water being provided by rivers and/or groundwater where the hydrogeological conditions are suitable, or from reservoirs elsewhere. Irrigation dams have been used for a thousand years in the Mediterranean area (Albergel et al, 2004) and have proved to be efficient in providing irrigation water in semi-arid regions, with a positive impact on the economic activity of the countries concerned (Khlifi et al, 2010). Although irrigation dams can be large, most of them are associated with reservoirs with small storage capacity located on farms, and therefore usually not connected to the main rivers, but connected to small brooks.…”

Section: Introductionmentioning

confidence: 99%

Small farm dams: impact on river flows and sustainability in a context of climate change

Habets

Philippe

Martin³

et al. 2014

Hydrol. Earth Syst. Sci.

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Abstract. The repetition of droughts in France has led to a growing demand for irrigation water and consequently to an increase in requests for the construction of small farm dams. Although such dams are small, their accumulation in a basin affects river flows, because the water collected in these small farm dams is used for irrigation and thus does not contribute to river flow. In order to gain more insight into their impact on the annual and monthly discharges, especially during dry years, a small farm dam model was built and connected to a hydrometeorological model. Several scenarios with different volume capacities, filling catchment sizes and filling periods were tested for such dams. The results were analysed in a small basin in western France, where the pressure for building such dams is high, and then extended to the entire country. It was found that, due to the hydrometeorological conditions (mainly low precipitation compared to other regions in France), the development of small farm dams in north-western France would result in greater decreases in river flows and less efficient filling of small farm dams than in other regions. Therefore, such dams might not be as efficient as expected in supplying water to farmers when needed. Moreover, the ability to fill small farm dams is projected to decrease in a context of climate change, despite the uncertainty on the evolution of precipitation, thus worsening the situation.

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“…Similarly, Khlifi et al (2010) demonstrated the positive impact of small dams on the economy and well being of communities in the Jendouba region, northeast of Tunisia. Among the main benefits were the significant increase in irrigated areas, the expansion of cereal crops and foraging vegetables in the summer.…”

Section: Dams Around the Worldmentioning

confidence: 92%

Environmental Impacts of Dams Around the World

Navia¹,

Amaya²

2019

J. Eng. Appl. Sci.

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A review of scientific literature, specifically in English, was carried out to identify the main impacts generated by the construction of large dams in Europe, Asia, Africa, Oceania and the Americas. In addition, a comparison was made between the impacts found in ex-ante studies and those found in ex-post investigations and significant differences were detected between the impacts identified in the studies before and after the construction of the projects. Thus, the interest in ecological and socioeconomic impacts, especially negative ones, predominates in the two types of studies, in contrast to the small number of investigations where the benefits of dams are evident. Finally, there are common impacts seen in almost all hydroelectric projects around the world such as the loss of economic sustenance, fertile land, jobs and physical displacement of people, among others.

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Impacts of small hill dams on agricultural development of hilly land in the Jendouba region of northwestern Tunisia

Cited by 17 publications

References 7 publications

Accounting for vegetation height and wind direction to correct eddy covariance measurements of energy fluxes over hilly crop fields

Accounting for vegetation height and wind direction to correct eddy covariance measurements of energy fluxes over hilly crop fields

Small farm dams: impact on river flows and sustainability in a context of climate change

Environmental Impacts of Dams Around the World

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