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Water 2019, 11(1), 156; https://doi.org/10.3390/w11010156

Hydrology of the Sirba River: Updating and Analysis of Discharge Time Series

1
DIATI, Politecnico di Torino, 10129 Torino, Italy
2
DIST, Politecnico di Torino & Università di Torino, 10129 Torino, Italy
*
Author to whom correspondence should be addressed.
Received: 6 December 2018 / Revised: 12 January 2019 / Accepted: 14 January 2019 / Published: 16 January 2019
(This article belongs to the Special Issue Hydrological Impacts of Climate Change and Land Use/Land Cover Change)
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Abstract

The Sahelian regions are affected by an increasing number of catastrophic floods in recent years as a consequence of climate and land use/land cover changes. River flow data is key to understanding river behavior and develop flood mitigation and prevention strategies. The present study provides a revision and an update of the existing discharge dataset of the Sirba River with the aim of enhancing the reliability of these data. The revision also includes the recalibration of the Garbey Kourou rating curves. The analysis of the revised discharge time series strengthens the previous findings, evidencing a positive trend in flood frequency and intensity over the entire analyzed period of 1956–2018. This positive trend is more pronounced for the last 40 years due to a significant underestimation of the rating curves used. A relevant finding is a new changepoint in the time series, detected for 2008, which represents the beginning of the period in which the highest flood magnitudes were registered. The effect of land use/land cover changes and climate changes on the water resource is depicted using flow duration curves. This research produces a revised and more reliable discharge time series that will be a new starting point for future hydrological analyses. View Full-Text
Keywords: Middle Niger River Basin; Sirba River; Sahel; floods; discharge time series; rating curves Middle Niger River Basin; Sirba River; Sahel; floods; discharge time series; rating curves
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Tamagnone, P.; Massazza, G.; Pezzoli, A.; Rosso, M. Hydrology of the Sirba River: Updating and Analysis of Discharge Time Series. Water 2019, 11, 156.

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