A 50-year analysis of hydrological trends and processes in a Mediterranean catchment
<p>The Réal Collobrier hydrological observatory in south-eastern France, managed by Irstea since 1966, constitutes a benchmark site for regional hydro-climatology. Because of the dense network of stream gauges and rain gauges available, this site provides a unique opportunity to evaluate long-...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2019-06-01
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| Series: | Hydrology and Earth System Sciences |
| Online Access: | https://www.hydrol-earth-syst-sci.net/23/2699/2019/hess-23-2699-2019.pdf |
| _version_ | 1828872106351263744 |
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| author | N. Folton E. Martin P. Arnaud P. L'Hermite M. Tolsa |
| author_facet | N. Folton E. Martin P. Arnaud P. L'Hermite M. Tolsa |
| author_sort | N. Folton |
| collection | DOAJ |
| description | <p>The Réal Collobrier hydrological observatory in south-eastern France,
managed by Irstea since 1966, constitutes a benchmark site for regional
hydro-climatology. Because of the dense network of stream gauges and
rain gauges available, this site provides a unique opportunity to evaluate
long-term hydro-meteorological Mediterranean trends. The main catchment (70 km<span class="inline-formula"><sup>2</sup></span>) and its sub-catchments are located in the Massif des Maures of south-eastern France, close to the Mediterranean coast. The vegetation is
composed of forest mainly calcified on crystalline soils (maquis of heath,
cork-oak, maritime pine and chestnut). Direct human influence has been
negligible over the past 50 years. The land use and land cover has remained
almost unchanged, with the notable exception of a wildfire in 1990 that
impacted a small sub-catchment. Therefore changes in the hydrological
response of the catchments are caused by changes in climate and/or physical
conditions. This study investigates changes in observational data using up
to 50-year daily series of precipitation and streamflow. The analysis used
several climate indices describing distinct modes of variability, at
inter-annual and seasonal timescales. Trends were assessed by the
Mann–Kendall method. The analysis also used hydrological indices describing
drought events based on daily data for a description of low flows, in
particular in terms of timing and severity. The analysis shows that there is
a marked tendency towards a decrease in the water resources of the Réal
Collobrier catchment in response to climate trends, with a consistent
increase in drought severity and duration. But the changes are variable
among the sub-catchments.</p> |
| first_indexed | 2024-12-13T06:46:57Z |
| format | Article |
| id | doaj.art-c23b136aae8d4084b9d8bfcf2c513355 |
| institution | Directory Open Access Journal |
| issn | 1027-5606 1607-7938 |
| language | English |
| last_indexed | 2024-12-13T06:46:57Z |
| publishDate | 2019-06-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Hydrology and Earth System Sciences |
| spelling | doaj.art-c23b136aae8d4084b9d8bfcf2c5133552022-12-21T23:56:15ZengCopernicus PublicationsHydrology and Earth System Sciences1027-56061607-79382019-06-01232699271410.5194/hess-23-2699-2019A 50-year analysis of hydrological trends and processes in a Mediterranean catchmentN. FoltonE. MartinP. ArnaudP. L'HermiteM. Tolsa<p>The Réal Collobrier hydrological observatory in south-eastern France, managed by Irstea since 1966, constitutes a benchmark site for regional hydro-climatology. Because of the dense network of stream gauges and rain gauges available, this site provides a unique opportunity to evaluate long-term hydro-meteorological Mediterranean trends. The main catchment (70 km<span class="inline-formula"><sup>2</sup></span>) and its sub-catchments are located in the Massif des Maures of south-eastern France, close to the Mediterranean coast. The vegetation is composed of forest mainly calcified on crystalline soils (maquis of heath, cork-oak, maritime pine and chestnut). Direct human influence has been negligible over the past 50 years. The land use and land cover has remained almost unchanged, with the notable exception of a wildfire in 1990 that impacted a small sub-catchment. Therefore changes in the hydrological response of the catchments are caused by changes in climate and/or physical conditions. This study investigates changes in observational data using up to 50-year daily series of precipitation and streamflow. The analysis used several climate indices describing distinct modes of variability, at inter-annual and seasonal timescales. Trends were assessed by the Mann–Kendall method. The analysis also used hydrological indices describing drought events based on daily data for a description of low flows, in particular in terms of timing and severity. The analysis shows that there is a marked tendency towards a decrease in the water resources of the Réal Collobrier catchment in response to climate trends, with a consistent increase in drought severity and duration. But the changes are variable among the sub-catchments.</p>https://www.hydrol-earth-syst-sci.net/23/2699/2019/hess-23-2699-2019.pdf |
| spellingShingle | N. Folton E. Martin P. Arnaud P. L'Hermite M. Tolsa A 50-year analysis of hydrological trends and processes in a Mediterranean catchment Hydrology and Earth System Sciences |
| title | A 50-year analysis of hydrological trends and processes in a Mediterranean catchment |
| title_full | A 50-year analysis of hydrological trends and processes in a Mediterranean catchment |
| title_fullStr | A 50-year analysis of hydrological trends and processes in a Mediterranean catchment |
| title_full_unstemmed | A 50-year analysis of hydrological trends and processes in a Mediterranean catchment |
| title_short | A 50-year analysis of hydrological trends and processes in a Mediterranean catchment |
| title_sort | 50 year analysis of hydrological trends and processes in a mediterranean catchment |
| url | https://www.hydrol-earth-syst-sci.net/23/2699/2019/hess-23-2699-2019.pdf |
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