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Title: Case study: Hydraulic modeling of runoff processes in Ghanaian inland valleys
Authors: Unami, Koichi  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0001-6910-1094 (unconfirmed)
Kawachi, Toshihiko
Kranjac-Berisavljevic, Gordana
Abagale, Felix Kofi
Maeda, Shigeya
Takeuchi, Junichiro  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0002-1299-6154 (unconfirmed)
Author's alias: 宇波, 耕一
Keywords: Africa
Floods
Ghana
Hydraulic models
Runoff
Shallow water
Issue Date: Jul-2009
Publisher: American Society of Civil Engineers
Journal title: Journal of Hydraulic Engineering
Volume: 135
Issue: 7
Start page: 539
End page: 553
Abstract: The inland valleys of West Africa are strategic in terms of food security and poverty alleviation, but scientific studies on hydrologic processes happening in these environments have not been well documented. Modeling approaches presented in this paper are an attempt to better comprehend hydraulic phenomena occurring in inland valleys. An inland valley situated in the Northern Region of Ghana is set as the study site. The inland valley comprises well-drained uplands and hydromorphic valley bottoms. There are several earthen dams across the valley bottoms, which are at the same time seasonal wetlands cultivated to rice during the rainy season. A finite volume model for the shallow water equations is developed to numerically simulate surface runoff flows in the valley bottoms during flood events. Innovation is necessitated to handle a series of different hydraulic phenomena. Flux-splitting and data reconstruction techniques are used to achieve stable computation in the complex topography of the valley bottoms. Standard problems of oblique hydraulic jump and dam break flows are used to test the accuracy of the numerical model. The Manning's roughness coefficient is determined from calibration in another Ghanaian watershed located in the Eastern Region. Using actually observed time series data of rainfall intensity, surface flows during the rainfall events are simulated in the computational domain representing the valley bottoms of the study area. Observed data of water levels in the dams are compared to predictions, and discrepancies between them are examined from the hydrological point of view. In the case of a hypothetical flood event, cascading collapses of the dams and flooding of cultivated fields are reproduced.
Rights: c 2009 ASCE. 許諾条件により本文は2009-10-01に公開.
This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。
URI: http://hdl.handle.net/2433/84831
DOI(Published Version): 10.1061/(ASCE)HY.1943-7900.0000041
Appears in Collections:Journal Articles

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