Understanding flood seasonality and flood regime shift in the Congo River Basin

Gode Bola; Raphael M.  Tshimanga; Jeff Neal; Mark A. Trigg; Laurence P Hawker; Vincent M. Lukandab Lukanda; Paul D Bates

doi:10.1080/02626667.2022.2083966

Understanding flood seasonality and flood regime shift in the Congo River Basin

Gode Bola^*, Raphael M. Tshimanga, Jeff Neal, Mark A. Trigg, Laurence P Hawker, Vincent M. Lukandab Lukanda, Paul D Bates

^*Corresponding author for this work

Research output: Contribution to journal › Article (Academic Journal) › peer-review

7 Citations (Scopus)

123 Downloads (Pure)

Abstract

In the sparsely investigated region of the Congo Basin (CB), flood seasonality and flood regime shift are established through relative frequency, cluster analysis, directional statistics, and non-overlapping block methods based on block maxima and peak over threshold (POT) series. Two months of significantly rich floods are observed at all gauging stations. The spatial distribution of floods presents three patterns: the north and northwest pattern, south and southeast pattern, and west/east pattern. It is observed that unimodal flood distribution is coherent in the northern and southern parts, as opposed to the bimodal flood distribution observed along the large band of the Equator from west to east of the basin. The time lag of flood indices suggests that the flood regime is not stationary. In addition, the time series show periods of high flooding, with POT frequencies and amplitudes higher during the 1960s and early 1970s than any other time period.

Original language	English
Pages (from-to)	1496-1515
Number of pages	20
Journal	Hydrological Sciences Journal
Volume	67
Issue number	10
Early online date	11 Jul 2022
DOIs	https://doi.org/10.1080/02626667.2022.2083966
Publication status	E-pub ahead of print - 11 Jul 2022

Bibliographical note

Funding Information:
We thank the Royal Society–DFID for their financial support. This study was part of the CRuHM project under the Africa Capacity Building Initiative (grants AQ150005 and FLR\R1\192057).

Publisher Copyright:
© 2022 IAHS.

Keywords

Congo Basin
Directional statistics
Mean day
Regime shift
Seasonality

Access to Document

10.1080/02626667.2022.2083966Licence: CC BY-NC-ND

Full-text PDF (author accepted manuscript)
This is the accepted author manuscript (AAM). The final published version (version of record) is available online via Taylor and Francis at https://doi.org/10.1080/02626667.2022.2083966. Please refer to any applicable terms of use of the publisher.
Accepted author manuscript, 1.45 MBLicence: CC BY-NC
Full-text PDF (final published version)
This is the final published version of the article (version of record). It first appeared online via Taylor and Francis at https://doi.org/10.1080/02626667.2022.2083966. Please refer to any applicable terms of use of the publisher.
Final published version, 14.1 MBLicence: CC BY-NC-ND

Handle.net

Persistent link

Congo River user Hydraulics and Morphology (CRuHM)
Bates, P. D. (Principal Investigator)
1/01/16 → 30/03/22
Project: Research

Cite this

@article{4f385ade2d37451c9e846bc46d128c71,

title = "Understanding flood seasonality and flood regime shift in the Congo River Basin",

abstract = "In the sparsely investigated region of the Congo Basin (CB), flood seasonality and flood regime shift are established through relative frequency, cluster analysis, directional statistics, and non-overlapping block methods based on block maxima and peak over threshold (POT) series. Two months of significantly rich floods are observed at all gauging stations. The spatial distribution of floods presents three patterns: the north and northwest pattern, south and southeast pattern, and west/east pattern. It is observed that unimodal flood distribution is coherent in the northern and southern parts, as opposed to the bimodal flood distribution observed along the large band of the Equator from west to east of the basin. The time lag of flood indices suggests that the flood regime is not stationary. In addition, the time series show periods of high flooding, with POT frequencies and amplitudes higher during the 1960s and early 1970s than any other time period.",

keywords = "Congo Basin, Directional statistics, Mean day, Regime shift, Seasonality",

author = "Gode Bola and Tshimanga, {Raphael M.} and Jeff Neal and Trigg, {Mark A.} and Hawker, {Laurence P} and Lukanda, {Vincent M. Lukandab} and Bates, {Paul D}",

note = "Funding Information: We thank the Royal Society–DFID for their financial support. This study was part of the CRuHM project under the Africa Capacity Building Initiative (grants AQ150005 and FLR\R1\192057). Publisher Copyright: {\textcopyright} 2022 IAHS.",

year = "2022",

month = jul,

day = "11",

doi = "10.1080/02626667.2022.2083966",

language = "English",

volume = "67",

pages = "1496--1515",

journal = "Hydrological Sciences Journal",

issn = "0262-6667",

publisher = "Taylor & Francis Group",

number = "10",

}

TY - JOUR

T1 - Understanding flood seasonality and flood regime shift in the Congo River Basin

AU - Bola, Gode

AU - Tshimanga, Raphael M.

AU - Neal, Jeff

AU - Trigg, Mark A.

AU - Hawker, Laurence P

AU - Lukanda, Vincent M. Lukandab

AU - Bates, Paul D

N1 - Funding Information: We thank the Royal Society–DFID for their financial support. This study was part of the CRuHM project under the Africa Capacity Building Initiative (grants AQ150005 and FLR\R1\192057). Publisher Copyright: © 2022 IAHS.

PY - 2022/7/11

Y1 - 2022/7/11

N2 - In the sparsely investigated region of the Congo Basin (CB), flood seasonality and flood regime shift are established through relative frequency, cluster analysis, directional statistics, and non-overlapping block methods based on block maxima and peak over threshold (POT) series. Two months of significantly rich floods are observed at all gauging stations. The spatial distribution of floods presents three patterns: the north and northwest pattern, south and southeast pattern, and west/east pattern. It is observed that unimodal flood distribution is coherent in the northern and southern parts, as opposed to the bimodal flood distribution observed along the large band of the Equator from west to east of the basin. The time lag of flood indices suggests that the flood regime is not stationary. In addition, the time series show periods of high flooding, with POT frequencies and amplitudes higher during the 1960s and early 1970s than any other time period.

AB - In the sparsely investigated region of the Congo Basin (CB), flood seasonality and flood regime shift are established through relative frequency, cluster analysis, directional statistics, and non-overlapping block methods based on block maxima and peak over threshold (POT) series. Two months of significantly rich floods are observed at all gauging stations. The spatial distribution of floods presents three patterns: the north and northwest pattern, south and southeast pattern, and west/east pattern. It is observed that unimodal flood distribution is coherent in the northern and southern parts, as opposed to the bimodal flood distribution observed along the large band of the Equator from west to east of the basin. The time lag of flood indices suggests that the flood regime is not stationary. In addition, the time series show periods of high flooding, with POT frequencies and amplitudes higher during the 1960s and early 1970s than any other time period.

KW - Congo Basin

KW - Directional statistics

KW - Mean day

KW - Regime shift

KW - Seasonality

U2 - 10.1080/02626667.2022.2083966

DO - 10.1080/02626667.2022.2083966

M3 - Article (Academic Journal)

SN - 0262-6667

VL - 67

SP - 1496

EP - 1515

JO - Hydrological Sciences Journal

JF - Hydrological Sciences Journal

IS - 10

ER -

Understanding flood seasonality and flood regime shift in the Congo River Basin

Abstract

Bibliographical note

Keywords

Access to Document

Handle.net

Fingerprint

Projects

Congo River user Hydraulics and Morphology (CRuHM)

Cite this