Predicting Low Flow Thresholds of Halda-Karnafuli Confluence in Bangladesh

A. Akter; A. H. Tanim

doi:10.1007/978-3-319-54612-4_22

Predicting Low Flow Thresholds of Halda-Karnafuli Confluence in Bangladesh

A. Akter, A. H. Tanim

Research output: Chapter in Book/Report/Conference proceeding › Chapter › peer-review

2 Scopus citations

Abstract

Eco-hydraulic modeling for flow assessment has increased in recent years due to complex hydraulic factors that control different life stages of ecological habitat. Both the Halda and Karnafuli Rivers play a vital role in the south-eastern part of Bangladesh. In almost every dry season they experience lower inflow. In this study, a 1D eco-hydraulic model, which is representing a Physical Habitat Simulation System (PHABSIM), and a 2D eco-hydraulic model for inflow regimes (CASiMiR), are applied to selected areas. To study low and minimum flow regimes two key factors, the Weighted Usable Area (WUA) and the Habitat Suitability Index (HSI) were applied. Based on the flow during flood tide and long term flow variability, a flow series was investigated to simulate suitable environmental flow regimes. Both models predicted similar trends in incremental discharge variation during minimum inflow and average minimum inflow operating in the in a range of 25–30.1 m³/s. Although, difficulties arise while acquiring river bed topography data in the 2D eco-hydraulic model set up, reasonable prediction accuracy and geometry of regime could be obtained. However, insufficient bathymetric data necessitated the application of 1D eco-hydraulic simualtion which yielded reasonable performance while taking suitable eco-hydraulic factors into account.

Original language	English
Title of host publication	Springer Water
Publisher	Springer Nature
Pages	303-314
Number of pages	12
DOIs	https://doi.org/10.1007/978-3-319-54612-4_22
State	Published - 2021
Externally published	Yes

Publication series

Name	Springer Water
ISSN (Print)	2364-6934
ISSN (Electronic)	2364-8198

Funding

Acknowledgement This research was supported by funds provided by the Center for River, Harbor & Landslide Research (CRHLSR), Chittagong University of Engineering and Technology (CUET), Bangladesh. The authors gratefully acknowledge the logistic supports provided by Chittagong Port Authority and Bangladesh Water Development Board, Bangladesh. This research was supported by funds provided by the Center for River, Harbor & Landslide Research (CRHLSR), Chittagong University of Engineering and Technology (CUET), Bangladesh. The authors gratefully acknowledge the logistic supports provided by Chittagong Port Authority and Bangladesh Water Development Board, Bangladesh.

Keywords

CASiMiR2D
Karnafuli river
Low flow
PHABSIM
Physical habitat

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10.1007/978-3-319-54612-4_22

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abstract = "Eco-hydraulic modeling for flow assessment has increased in recent years due to complex hydraulic factors that control different life stages of ecological habitat. Both the Halda and Karnafuli Rivers play a vital role in the south-eastern part of Bangladesh. In almost every dry season they experience lower inflow. In this study, a 1D eco-hydraulic model, which is representing a Physical Habitat Simulation System (PHABSIM), and a 2D eco-hydraulic model for inflow regimes (CASiMiR), are applied to selected areas. To study low and minimum flow regimes two key factors, the Weighted Usable Area (WUA) and the Habitat Suitability Index (HSI) were applied. Based on the flow during flood tide and long term flow variability, a flow series was investigated to simulate suitable environmental flow regimes. Both models predicted similar trends in incremental discharge variation during minimum inflow and average minimum inflow operating in the in a range of 25–30.1 m3/s. Although, difficulties arise while acquiring river bed topography data in the 2D eco-hydraulic model set up, reasonable prediction accuracy and geometry of regime could be obtained. However, insufficient bathymetric data necessitated the application of 1D eco-hydraulic simualtion which yielded reasonable performance while taking suitable eco-hydraulic factors into account.",

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AB - Eco-hydraulic modeling for flow assessment has increased in recent years due to complex hydraulic factors that control different life stages of ecological habitat. Both the Halda and Karnafuli Rivers play a vital role in the south-eastern part of Bangladesh. In almost every dry season they experience lower inflow. In this study, a 1D eco-hydraulic model, which is representing a Physical Habitat Simulation System (PHABSIM), and a 2D eco-hydraulic model for inflow regimes (CASiMiR), are applied to selected areas. To study low and minimum flow regimes two key factors, the Weighted Usable Area (WUA) and the Habitat Suitability Index (HSI) were applied. Based on the flow during flood tide and long term flow variability, a flow series was investigated to simulate suitable environmental flow regimes. Both models predicted similar trends in incremental discharge variation during minimum inflow and average minimum inflow operating in the in a range of 25–30.1 m3/s. Although, difficulties arise while acquiring river bed topography data in the 2D eco-hydraulic model set up, reasonable prediction accuracy and geometry of regime could be obtained. However, insufficient bathymetric data necessitated the application of 1D eco-hydraulic simualtion which yielded reasonable performance while taking suitable eco-hydraulic factors into account.

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Predicting Low Flow Thresholds of Halda-Karnafuli Confluence in Bangladesh

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