Sécheresses des sols en France et changement climatique : Résultats et applications du projet ClimSec

Soubeyroux, Jean‐Michel; Kitova, N.; Blanchard, Michèle; Vidal, Jean‐Philippe; Martin, Éric; Dandin, Philippe

doi:10.4267/2042/47512

Cited by 21 publications

(20 citation statements)

References 12 publications

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“…As for winter, a highly significant decline of soil water content impacts the entire watershed during summer, for both historical and projected period. Decreasing of soil water content can reaches 50% in the downstream part of the catchment which is coherent with the literature at the national scale [86,87]. One would thus expect evapotranspiration fluxes to increase, following the increase of temperature, which would stress soil water content.…”

Section: Discussionsupporting

confidence: 85%

Coevolution of Hydrological Cycle Components under Climate Change: The Case of the Garonne River in France

Grusson

Anctil

Sauvage

et al. 2018

Water

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Climate change is suspected to impact water circulation within the hydrological cycle at catchment scale. A SWAT model approach to assess the evolution of the many hydrological components of the Garonne catchment (Southern France) is deployed in this study. Performance over the calibration period (2000–2010) are satisfactory, with Nash–Sutcliffe ranging from 0.55 to 0.94 or R2 from 0.86 to 0.98. Similar performance values are obtained in validation (1962–2000). Water cycle is first analyzed based on past observed climatic data (1962–2010) to understand its variations and geographical spread. Comparison is then conducted against the different trends obtained from a climate ensemble over 2010–2050. Results show a strong impact on green water, such as a reduction of the soil water content (SWC) and a substantial increase in evapotranspiration (ET) in winter. In summer, however, some part of the watershed faces lower ET fluxes because of a lack of SWC to answer the evapotranspiratory demand, highlighting possible future deficits of green water stocks. Blue water fluxes are found significantly decreasing during summer, when in winter, discharge in the higher part of the watershed is found increasing because of a lower snow stock associated to an increase of liquid precipitation, benefiting surface runoff.

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Section: Discussionsupporting

confidence: 85%

Coevolution of Hydrological Cycle Components under Climate Change: The Case of the Garonne River in France

Grusson

Anctil

Sauvage

et al. 2018

Water

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“…Some common indicators from that family are the Normalised Difference Vegetation Index (NDVI), the Leaf Area Index (LAI) or the Soil Water Storage (SWS) which require more complex data such as spectral reflectance, leaf and ground area, soil type, available water content and more. Finally, the last smaller family of indicators are hydrological indexes, some examples of which are the Streamflow Drought Index (SDI), Standardised Runoff Index (SRI) or the Standardised Soil Water Index (SSWI) -which is used by Météo-France to characterise droughts and applied in the characterisation of soil dryness and climate change in (Soubeyroux et al (2012)) -which require streamflow values, runoff information or soil water data.…”

Section: Drought Indices Used As Covariatesmentioning

confidence: 99%

Predicting Drought and Subsidence Risks in France

Charpentier

James²,

Ali³

2021

Preprint

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Abstract. The economic consequences of drought episodes are increasingly important, although they are often difficult to apprehend in part because of the complexity of the underlying mechanisms. In this article, we will study one of the consequences of drought, namely the risk of subsidence (or more specifically clay shrinkage induced subsidence), for which insurance has been mandatory in France for several decades. Using data obtained from several insurers, representing about a quarter of the household insurance market, over the past twenty years, we propose some statistical models to predict the frequency but also the intensity of these droughts, for insurers, showing that climate change will have probably major economic consequences on this risk. But even if we use more advanced models than standard regression-type models (here random forests to capture non linearity and cross effects), it is still difficult to predict the economic cost of subsidence claims, even if all geophysical and climatic information is available.

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“…In the Mediterranean basin, weather models forecast an increase in summer droughts and increased temperatures. This overall trend would be accompanied by a larger frequency of extreme events such as torrential rain and drought (Soubeyroux et al 2012). These extreme events, their intensity (duration, frequency) and the suddenness with which they arrive are likely to directly affect the soils causing their degradation and consequently the desertification of these areas.…”

Section: Chemical Variablesmentioning

confidence: 99%

“…Increased fire frequency can severely degrade soil quality (Borsali 2013). The degradation of a soil corresponds to the loss or reduction of its functions and is mainly due to a decrease in its productive capacities and its environmental regulation capacity, thus contributing to the biological cycle deregulation (Soubeyroux et al 2012). The deregulation of these cycles can alter the nutrient cycles resulting in ecosystem degradation and indirectly an impact on human well-being.…”

Section: Introductionmentioning

confidence: 99%

Microbial activities and physicochemical properties of coniferous forest soils in two forest areas (arid and semi-arid) of western Algeria

Zouidi¹,

Amine²,

Allam³

et al. 2019

Bosque (Valdivia)

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The Algerian forest, the last bulwark against desertification coming from Sahel, is particularly vulnerable to global change and must be protected from deforestation, which is constantly advancing. Aleppo pine, which covers 880,000 ha, is the predominant species of forests in semi-arid and arid regions. The soils of these regions are generally fragile and vulnerable due to climatic aridity; their degradation today has accentuated the phenomenon of desertification.The objective of this work was to compare the physicochemical and microbiological characteristics of the coniferous forest soils of the semi-arid and arid zones of the Algerian west. In addition to characterization of climates, 16 physical, chemical and microbiological properties were analyzed on soils collected from forest areas characteristic of the two zones: Jebel Sid Ahmed Zeggai forest massif (Saida province) located in the semi-arid zone and the forest massif of jebel Antar (Naama province) located in the arid zone. Our results showed very different soil qualities between the two zones: moisture content, water retention capacity, permeability, porosity and organic carbon content, total nitrogen and organic matter are higher in the semi-arid zone compared with the arid zone, which is characterized by the large presence of total limestone. Biomass and microbial basal respiration are higher in the semi-arid zone. Our results are discussed with regard to the vulnerability of soils to the respective climate of each of the zones and agro-silvo practices potentially involved in the degradation of these soils.

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Sécheresses des sols en France et changement climatique : Résultats et applications du projet ClimSec

Cited by 21 publications

References 12 publications

Coevolution of Hydrological Cycle Components under Climate Change: The Case of the Garonne River in France

Coevolution of Hydrological Cycle Components under Climate Change: The Case of the Garonne River in France

Predicting Drought and Subsidence Risks in France

Microbial activities and physicochemical properties of coniferous forest soils in two forest areas (arid and semi-arid) of western Algeria

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