Determination of Flow Characteristics of Ohashi River through 3-D Hydrodynamic Model under Simplified and Detailed Bathymetric Conditions

The Ohashi River is a narrow water stream that connects two brackish lakes in Japan. Intermittent saline water intrusion often occurs in Lake Shinji from Lake Nakaumi through Ohashi River. In this study, two approaches were discussed to reproduce the hydrodynamic conditions of a morphologically comp...

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Autores principales:	Muhammad Ali Hafeez, Tetsunori Inoue
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	river bathymetry hydrodynamic modelling saline water intrusion (SWI) Hydraulic engineering TC1-978 Water supply for domestic and industrial purposes TD201-500
Acceso en línea:	https://doaj.org/article/2e1c7d3ff3074fc5b3402b6146a98211
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spelling	oai:doaj.org-article:2e1c7d3ff3074fc5b3402b6146a982112021-11-11T19:56:36ZDetermination of Flow Characteristics of Ohashi River through 3-D Hydrodynamic Model under Simplified and Detailed Bathymetric Conditions10.3390/w132130762073-4441https://doaj.org/article/2e1c7d3ff3074fc5b3402b6146a982112021-11-01T00:00:00Zhttps://www.mdpi.com/2073-4441/13/21/3076https://doaj.org/toc/2073-4441The Ohashi River is a narrow water stream that connects two brackish lakes in Japan. Intermittent saline water intrusion often occurs in Lake Shinji from Lake Nakaumi through Ohashi River. In this study, two approaches were discussed to reproduce the hydrodynamic conditions of a morphologically complex river. In the first approach, the river sinuosity was straightened. The straightening of the river resulted in a higher flow velocity and water flux coefficient due to the reduction in the flow path and the resistance, and this approach was found to be appropriate for the reproduction of the flow velocity. However, the river shape was visually quite different from the actual river morphology. In the second approach, the prime focus was given to the shape and bathymetry to quantitively reproduce the flowrate of the saline water intrusion. This approach resulted in an underestimation of the flow velocity, which was compensated by increasing the cross-sectional area of the river. A slower flow velocity causes up to a 3-h time lag for the water mass to pass through the Ohashi River, which in principle should affect the temporal variations of the water temperature and salinity. Fortunately, as the typical time scale for water temperature and salinity fluctuations in the Ohashi River is a few days, a 3-h time lag did not cause any problems.Muhammad Ali HafeezTetsunori InoueMDPI AGarticleriver bathymetryhydrodynamic modellingsaline water intrusion (SWI)Hydraulic engineeringTC1-978Water supply for domestic and industrial purposesTD201-500ENWater, Vol 13, Iss 3076, p 3076 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	river bathymetry hydrodynamic modelling saline water intrusion (SWI) Hydraulic engineering TC1-978 Water supply for domestic and industrial purposes TD201-500
spellingShingle	river bathymetry hydrodynamic modelling saline water intrusion (SWI) Hydraulic engineering TC1-978 Water supply for domestic and industrial purposes TD201-500 Muhammad Ali Hafeez Tetsunori Inoue Determination of Flow Characteristics of Ohashi River through 3-D Hydrodynamic Model under Simplified and Detailed Bathymetric Conditions
description	The Ohashi River is a narrow water stream that connects two brackish lakes in Japan. Intermittent saline water intrusion often occurs in Lake Shinji from Lake Nakaumi through Ohashi River. In this study, two approaches were discussed to reproduce the hydrodynamic conditions of a morphologically complex river. In the first approach, the river sinuosity was straightened. The straightening of the river resulted in a higher flow velocity and water flux coefficient due to the reduction in the flow path and the resistance, and this approach was found to be appropriate for the reproduction of the flow velocity. However, the river shape was visually quite different from the actual river morphology. In the second approach, the prime focus was given to the shape and bathymetry to quantitively reproduce the flowrate of the saline water intrusion. This approach resulted in an underestimation of the flow velocity, which was compensated by increasing the cross-sectional area of the river. A slower flow velocity causes up to a 3-h time lag for the water mass to pass through the Ohashi River, which in principle should affect the temporal variations of the water temperature and salinity. Fortunately, as the typical time scale for water temperature and salinity fluctuations in the Ohashi River is a few days, a 3-h time lag did not cause any problems.
format	article
author	Muhammad Ali Hafeez Tetsunori Inoue
author_facet	Muhammad Ali Hafeez Tetsunori Inoue
author_sort	Muhammad Ali Hafeez
title	Determination of Flow Characteristics of Ohashi River through 3-D Hydrodynamic Model under Simplified and Detailed Bathymetric Conditions
title_short	Determination of Flow Characteristics of Ohashi River through 3-D Hydrodynamic Model under Simplified and Detailed Bathymetric Conditions
title_full	Determination of Flow Characteristics of Ohashi River through 3-D Hydrodynamic Model under Simplified and Detailed Bathymetric Conditions
title_fullStr	Determination of Flow Characteristics of Ohashi River through 3-D Hydrodynamic Model under Simplified and Detailed Bathymetric Conditions
title_full_unstemmed	Determination of Flow Characteristics of Ohashi River through 3-D Hydrodynamic Model under Simplified and Detailed Bathymetric Conditions
title_sort	determination of flow characteristics of ohashi river through 3-d hydrodynamic model under simplified and detailed bathymetric conditions
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/2e1c7d3ff3074fc5b3402b6146a98211
work_keys_str_mv	AT muhammadalihafeez determinationofflowcharacteristicsofohashiriverthrough3dhydrodynamicmodelundersimplifiedanddetailedbathymetricconditions AT tetsunoriinoue determinationofflowcharacteristicsofohashiriverthrough3dhydrodynamicmodelundersimplifiedanddetailedbathymetricconditions
_version_	1718431339579965440

Determination of Flow Characteristics of Ohashi River through 3-D Hydrodynamic Model under Simplified and Detailed Bathymetric Conditions

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