Analysis of hydrological changes and flood increase in Niamey based on the PERSIANN-CDR satellite rainfall estimate and hydrological simulations over the 1983–2013 period
A dramatic increase in the frequency and intensity of floods due to the Niger River in the city of Niamey (Niger) has been observed in the last decade. Previous studies highlighted the role of the land use changes on the flood increase since 1970s. In the last decade, observations have raised the...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2015-06-01
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| Series: | Proceedings of the International Association of Hydrological Sciences |
| Online Access: | https://www.proc-iahs.net/370/117/2015/piahs-370-117-2015.pdf |
| _version_ | 1818443381662023680 |
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| author | C. Casse M. Gosset |
| author_facet | C. Casse M. Gosset |
| author_sort | C. Casse |
| collection | DOAJ |
| description | A dramatic increase in the frequency and intensity of floods due to the Niger
River in the city of Niamey (Niger) has been observed in the last decade.
Previous studies highlighted the role of the land use changes on the flood
increase since 1970s. In the last decade, observations have raised the issue
of a possible increase in extreme rainfall in the Sahel, which may have
caused the recent and extreme floods in Niamey in 2010, 2012 and 2013. The
study focuses on the 125 000 km<sup>2</sup> basin between Ansongo and Niamey.
This is the drainage area of the monsoon rainfall that leads to the rapid
flow rise occurring between June and October. To understand the possible role
of rainfall in flood intensification, satellite rainfall estimate is
attractive in a region where the operational gauge network is sparse. This
paper analyses the evolution of the Niger hydrograph in Niamey based on
discharge observations, hydrological modelling and the satellite product
PERSIANN-CDR, over the 1983–2013 period. PERSIANN-CDR is first compared with
four other rainfall products. The salient features of the observed changes,
i.e. a marked change in the mean decadal hydrograph, is well mimicked by the
simulations, implying that rainfall is the first driver to the observed
changes. The increase of flooded years over the period is also well
reproduced but with some uncertainties in the exact number of flood days per
year. |
| first_indexed | 2024-12-14T18:59:08Z |
| format | Article |
| id | doaj.art-68543f0f4cab40cd92e8ad31239627e8 |
| institution | Directory Open Access Journal |
| issn | 2199-8981 2199-899X |
| language | English |
| last_indexed | 2024-12-14T18:59:08Z |
| publishDate | 2015-06-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Proceedings of the International Association of Hydrological Sciences |
| spelling | doaj.art-68543f0f4cab40cd92e8ad31239627e82022-12-21T22:51:00ZengCopernicus PublicationsProceedings of the International Association of Hydrological Sciences2199-89812199-899X2015-06-0137011712310.5194/piahs-370-117-2015Analysis of hydrological changes and flood increase in Niamey based on the PERSIANN-CDR satellite rainfall estimate and hydrological simulations over the 1983–2013 periodC. Casse0M. Gosset1Géoscience Environnement Toulouse, Toulouse, FranceGéoscience Environnement Toulouse, Toulouse, FranceA dramatic increase in the frequency and intensity of floods due to the Niger River in the city of Niamey (Niger) has been observed in the last decade. Previous studies highlighted the role of the land use changes on the flood increase since 1970s. In the last decade, observations have raised the issue of a possible increase in extreme rainfall in the Sahel, which may have caused the recent and extreme floods in Niamey in 2010, 2012 and 2013. The study focuses on the 125 000 km<sup>2</sup> basin between Ansongo and Niamey. This is the drainage area of the monsoon rainfall that leads to the rapid flow rise occurring between June and October. To understand the possible role of rainfall in flood intensification, satellite rainfall estimate is attractive in a region where the operational gauge network is sparse. This paper analyses the evolution of the Niger hydrograph in Niamey based on discharge observations, hydrological modelling and the satellite product PERSIANN-CDR, over the 1983–2013 period. PERSIANN-CDR is first compared with four other rainfall products. The salient features of the observed changes, i.e. a marked change in the mean decadal hydrograph, is well mimicked by the simulations, implying that rainfall is the first driver to the observed changes. The increase of flooded years over the period is also well reproduced but with some uncertainties in the exact number of flood days per year.https://www.proc-iahs.net/370/117/2015/piahs-370-117-2015.pdf |
| spellingShingle | C. Casse M. Gosset Analysis of hydrological changes and flood increase in Niamey based on the PERSIANN-CDR satellite rainfall estimate and hydrological simulations over the 1983–2013 period Proceedings of the International Association of Hydrological Sciences |
| title | Analysis of hydrological changes and flood increase in Niamey based on the PERSIANN-CDR satellite rainfall estimate and hydrological simulations over the 1983–2013 period |
| title_full | Analysis of hydrological changes and flood increase in Niamey based on the PERSIANN-CDR satellite rainfall estimate and hydrological simulations over the 1983–2013 period |
| title_fullStr | Analysis of hydrological changes and flood increase in Niamey based on the PERSIANN-CDR satellite rainfall estimate and hydrological simulations over the 1983–2013 period |
| title_full_unstemmed | Analysis of hydrological changes and flood increase in Niamey based on the PERSIANN-CDR satellite rainfall estimate and hydrological simulations over the 1983–2013 period |
| title_short | Analysis of hydrological changes and flood increase in Niamey based on the PERSIANN-CDR satellite rainfall estimate and hydrological simulations over the 1983–2013 period |
| title_sort | analysis of hydrological changes and flood increase in niamey based on the persiann cdr satellite rainfall estimate and hydrological simulations over the 1983 2013 period |
| url | https://www.proc-iahs.net/370/117/2015/piahs-370-117-2015.pdf |
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