An Empirical Investigation on Hydro-Morphological Process of Surma River: Substantiation from North-East Zone of Bangladesh

Year 2019, Volume: 6 Issue: 1, 83 - 114, 12.04.2019

Md.salamun Rashidin , Sara Javed Dr. Bin Liu Tafsirojjaman Tafsirojjaman

https://doi.org/10.30897/ijegeo.518468

Cited By: 1

Abstract

Objective
of the study is to know the inherent morphological process of the river system
in the Haor areas of sylhet basin. The specific objective is to “validate the
existing conceptual Model of the CEGIS”. This research for the validation of
the CEGIS Model. Primary data was collected through routine measurements of
discharge, sediment concentration, measurements of cross-sections, sediment
concentration measurements. Secondary data was collected on water level,
discharge, velocity and cross-section from the BWDB. Satellite images have been
collected from USGS. A thorough review of the manuals of different numerical
models were carried out. After evaluation of the models HEC-RAS 5.0.3 has been
selected. Validation of the CEGIS conceptual Model was tried using both
conventional way of data analysis as well as from model output. Both the models
have been fine-tuned and simulated to predict the future scenarios with 20%
increase of discharge as well as 20% decrease of discharge at the upstream.
Findings of the study confirms the acceptability of Hypothesis 1, Hypothesis 2
could not be (conclusively) validated. Concluded that, the bankfull water
levels at the downstream decrease, changes in channel dimension, the change of
both the area and the top width shows a scattered pattern and change of average
depth shows a decreasing trend towards downstream direction. (i) Conventional
analysis, Hypotheses 3 may be considered validated (ii) From Model output, it
may be stated that the Hypothesis 3 may be considered as not validated.
Hypotheses 4 and 5 relate to the hypothetical ‘Regime Condition’ of the river.
Its clear that the Surma River is not in ‘Regime Condition’. So the hypothesis
could not be validated through the model output. But ‘Regime Condition’ is a
theoretical condition of a river, the validity of these two hypotheses (4 and
5) can be accepted on Theoretical explanation basis.

Keywords

Hydro-morphological Process;, Model Validation, Sylhet Haor Basin

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