Precipitation trends in the Gambia River Basin (Senegal) for the period 1971-2010
Since the 1970s, West African streams experienced profound modifications connected to pluviometric deficit, which have influenced on a strong decrease of water resources. The objective of this study is to analyze trends of precipitation at the six selected stations in the Senegalese part of...
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| Format: | Article |
| Language: | English |
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Serbian Geographical Society
2018-01-01
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| Series: | Glasnik Srpskog Geografskog Društva |
| Subjects: | |
| Online Access: | http://www.doiserbia.nb.rs/img/doi/0350-3593/2018/0350-35931802045F.pdf |
| _version_ | 1818837643105927168 |
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| author | Faye Cheikh |
| author_facet | Faye Cheikh |
| author_sort | Faye Cheikh |
| collection | DOAJ |
| description | Since the 1970s, West African streams experienced profound modifications
connected to pluviometric deficit, which have influenced on a strong decrease
of water resources. The objective of this study is to analyze trends of
precipitation at the six selected stations in the Senegalese part of Gambia
River basin, using graphical and statistical approach. Methodology is
consisted of an analysis of monthly, seasonal and annual variability of
precipitation for the 1971-2010 period, through Non-parametric tests. Study
revealed a strong variability and often a contrasting evolution between
various stations (Kédougou, Simenti, Tambacounda, Kounghel, Nioro and
Goudiry). Between the periods 1971-1990 and 1991-2010, the value U of
Mann-Whitney, had changed from 60 to 40 at Tambacounda, 64 to 59 at Kédougou
and 63 to 51 at Simenti station, which showed non-significant trends in
annual total precipitation for the studied period. Sen’s estimator revealed
significant descending trends on Kédougou station (9.812 mm/year for the
period 1971-1990 and 0.309 mm/year for the period 1991-2010), and Simenti
station too. On the other hand (in the whole article), on the stations of
Tambacounda, Goudiry and Koungheul, the reduction is noticed for the period
1971-1990 (3.658 mm/year on Tambacounda), and an increase is noticed in the
period 1991-2010 (13.21 mm/year on Tambacounda). For the station Nioro, on
other hand, increase is noted in both periods (3.801 mm/year and 8.841
mm/year). The assumption is that these significant trends of precipitation
during the last four decades could be attributed to the climate changes. |
| first_indexed | 2024-12-19T03:25:45Z |
| format | Article |
| id | doaj.art-f609c769698a4bd690a5be1c0e3e6475 |
| institution | Directory Open Access Journal |
| issn | 0350-3593 2406-078X |
| language | English |
| last_indexed | 2024-12-19T03:25:45Z |
| publishDate | 2018-01-01 |
| publisher | Serbian Geographical Society |
| record_format | Article |
| series | Glasnik Srpskog Geografskog Društva |
| spelling | doaj.art-f609c769698a4bd690a5be1c0e3e64752022-12-21T20:37:39ZengSerbian Geographical SocietyGlasnik Srpskog Geografskog Društva0350-35932406-078X2018-01-01982455710.2298/GSGD1802045F0350-35931802045FPrecipitation trends in the Gambia River Basin (Senegal) for the period 1971-2010Faye Cheikh0Assane Seck University of Zlguinchor, U.F.R. Science and Technology, Department of Geography, SenegalSince the 1970s, West African streams experienced profound modifications connected to pluviometric deficit, which have influenced on a strong decrease of water resources. The objective of this study is to analyze trends of precipitation at the six selected stations in the Senegalese part of Gambia River basin, using graphical and statistical approach. Methodology is consisted of an analysis of monthly, seasonal and annual variability of precipitation for the 1971-2010 period, through Non-parametric tests. Study revealed a strong variability and often a contrasting evolution between various stations (Kédougou, Simenti, Tambacounda, Kounghel, Nioro and Goudiry). Between the periods 1971-1990 and 1991-2010, the value U of Mann-Whitney, had changed from 60 to 40 at Tambacounda, 64 to 59 at Kédougou and 63 to 51 at Simenti station, which showed non-significant trends in annual total precipitation for the studied period. Sen’s estimator revealed significant descending trends on Kédougou station (9.812 mm/year for the period 1971-1990 and 0.309 mm/year for the period 1991-2010), and Simenti station too. On the other hand (in the whole article), on the stations of Tambacounda, Goudiry and Koungheul, the reduction is noticed for the period 1971-1990 (3.658 mm/year on Tambacounda), and an increase is noticed in the period 1991-2010 (13.21 mm/year on Tambacounda). For the station Nioro, on other hand, increase is noted in both periods (3.801 mm/year and 8.841 mm/year). The assumption is that these significant trends of precipitation during the last four decades could be attributed to the climate changes.http://www.doiserbia.nb.rs/img/doi/0350-3593/2018/0350-35931802045F.pdfrainfalltrendnon-parametric testsGambia RiverSenegal |
| spellingShingle | Faye Cheikh Precipitation trends in the Gambia River Basin (Senegal) for the period 1971-2010 Glasnik Srpskog Geografskog Društva rainfall trend non-parametric tests Gambia River Senegal |
| title | Precipitation trends in the Gambia River Basin (Senegal) for the period 1971-2010 |
| title_full | Precipitation trends in the Gambia River Basin (Senegal) for the period 1971-2010 |
| title_fullStr | Precipitation trends in the Gambia River Basin (Senegal) for the period 1971-2010 |
| title_full_unstemmed | Precipitation trends in the Gambia River Basin (Senegal) for the period 1971-2010 |
| title_short | Precipitation trends in the Gambia River Basin (Senegal) for the period 1971-2010 |
| title_sort | precipitation trends in the gambia river basin senegal for the period 1971 2010 |
| topic | rainfall trend non-parametric tests Gambia River Senegal |
| url | http://www.doiserbia.nb.rs/img/doi/0350-3593/2018/0350-35931802045F.pdf |
| work_keys_str_mv | AT fayecheikh precipitationtrendsinthegambiariverbasinsenegalfortheperiod19712010 |