Volume 17, Issue 2, July 2016, Pages 531–547
Jean-Marie Tshitenge Mbuebue1, Albert Mbata Muliwavyo2, Vincent Lukanda Mwamba3, Edmond Phuku Phuati4, Albert Kazadi Mukenga Bantu5, and Franck Tondozi Keto6
1 Department of Physics, University of Kinshasa, B.P. 190 Kinshasa XI, RD Congo
2 Department of Physics, University of Kinshasa, B.P. 190 Kinshasa XI, RD Congo
3 Department of Physics, University of Kinshasa, B.P. 190 Kinshasa XI, RD Congo
4 Department of Physics, University of Kinshasa, B.P. 190 Kinshasa XI, RD Congo
5 Department of Physics, University of Kinshasa, B.P. 190 Kinshasa XI, RD Congo
6 Department of Physics, University of Kinshasa, B.P. 190 Kinshasa XI, RD Congo
Original language: English
Copyright © 2016 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
The present study was undertaken with the aim of contributing to the characterization of the nonstationary variability of the hydrological regime of the Kasai River using the wavelet analysis for 1940-1999. The rainfalls and discharge over Kasai Basin have marked fluctuations with a perceptible downward trend and some shift around 1950, 1960, 1970, 1983 and 1994. The results show that rainfalls over Kasai basin and the discharge at Ilebo station patterns exhibit a strong annual oscillation and some intermittent oscillations in 2-8 years (1950-1975, 1983-1995) and 8-16 years (1970-1999) time scales. The wavelet coherence analysis reveals a weak possible connection between hydrological variables (rainfalls, discharge) and climate indices relative to sea surface temperature and atmospheric circulation over Atlantic tropical, Indian and Pacific Oceans (coherence less than 0.55).
Author Keywords: wavelet transform, coherence analysis, rainfall, discharge, climate indices.
Jean-Marie Tshitenge Mbuebue1, Albert Mbata Muliwavyo2, Vincent Lukanda Mwamba3, Edmond Phuku Phuati4, Albert Kazadi Mukenga Bantu5, and Franck Tondozi Keto6
1 Department of Physics, University of Kinshasa, B.P. 190 Kinshasa XI, RD Congo
2 Department of Physics, University of Kinshasa, B.P. 190 Kinshasa XI, RD Congo
3 Department of Physics, University of Kinshasa, B.P. 190 Kinshasa XI, RD Congo
4 Department of Physics, University of Kinshasa, B.P. 190 Kinshasa XI, RD Congo
5 Department of Physics, University of Kinshasa, B.P. 190 Kinshasa XI, RD Congo
6 Department of Physics, University of Kinshasa, B.P. 190 Kinshasa XI, RD Congo
Original language: English
Copyright © 2016 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
The present study was undertaken with the aim of contributing to the characterization of the nonstationary variability of the hydrological regime of the Kasai River using the wavelet analysis for 1940-1999. The rainfalls and discharge over Kasai Basin have marked fluctuations with a perceptible downward trend and some shift around 1950, 1960, 1970, 1983 and 1994. The results show that rainfalls over Kasai basin and the discharge at Ilebo station patterns exhibit a strong annual oscillation and some intermittent oscillations in 2-8 years (1950-1975, 1983-1995) and 8-16 years (1970-1999) time scales. The wavelet coherence analysis reveals a weak possible connection between hydrological variables (rainfalls, discharge) and climate indices relative to sea surface temperature and atmospheric circulation over Atlantic tropical, Indian and Pacific Oceans (coherence less than 0.55).
Author Keywords: wavelet transform, coherence analysis, rainfall, discharge, climate indices.
How to Cite this Article
Jean-Marie Tshitenge Mbuebue, Albert Mbata Muliwavyo, Vincent Lukanda Mwamba, Edmond Phuku Phuati, Albert Kazadi Mukenga Bantu, and Franck Tondozi Keto, “Time-scale characteristics of Kasai river hydrological regime variability for 1940-1999,” International Journal of Innovation and Applied Studies, vol. 17, no. 2, pp. 531–547, July 2016.
