Improving the Hydro-Morpho Dynamics of A River Confluence by Using Vanes

Ali, Hydar Lafta; Yusuf, Badronnisa; Mohammed, Thamer Ahamed; Shimizu, Yasuyuki; Razak, Mohd Shahrizal Ab; Rehan, Balqis Mohamed

doi:10.3390/resources8010009

Cited by 5 publications

(3 citation statements)

References 50 publications

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“…MFlow 02 solves two-dimensional unsteady flow and riverbed variation and due to its use of an unstructured mesh, is practical for the study of geomorphodynamic evolution of complex bed surfaces including the development of sandbars at river confluences, and the geomorphological impact assessment of piers and vegetation Gamou (2011) ; Nones et al. (2018) ; Nones (2019) ; Ali et al. (2019) ; Shimizu et al.…”

Section: Methodsmentioning

confidence: 99%

Geomorphodynamics, evolution, and ecology of vertical roots

Heidelman

Vural

2023

Front. Plant Sci.

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The roots of some coastal and wetland trees grow peculiar vertical protrusions, the function of which remains unclear. Here, using computational simulations based on first-principles fluid and sedimentation dynamics, we argue that the protrusions work together to create an elevated patch of sediment downstream of the tree, thereby creating its own fertile flood-protected breeding grounds for the seedlings. In our simulations, we vary the vertical root diameter, root spacing and total root area and show that there is an optimal vertical root spacing that depends on root thickness. Next, we quantify and discuss the cooperative effects between adjacent vertical root patches. Lastly, by varying vertical root spacing of a patch of trees, we estimate a maximal vegetation density for which vertical-root production has a beneficial geomorphological response. Our hypothesis suggests that vertical roots, such as the ‘knee roots’ of baldcypress trees, have an important role in shaping riparian geomorphology and community structure.

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Section: Methodsmentioning

confidence: 99%

Geomorphodynamics, evolution, and ecology of vertical roots

Heidelman

Vural

2023

Front. Plant Sci.

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“…Current advance in remote sensing and GIS enables us understand the extent to which river confluences are dynamic, planform characteristics and decadal evolution of the confluence points (Trigg et al 2012;Lewin and Ashworth, 2014;Mount et al 2013). In recent time, many aspects of river confluence like sediment, flow structure, and morpho-dynamics are being focused throughout the world to understand the process and mitigate the possible hazards (Ali et al 2019;Szupiany et al 2019;Sankey et al 2018;Rhoads and Johnson 2018). In the river confluence zone, erosion-accretion is considered a prime focal point.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Morpho-Dynamics through Geospatial Techniques within the Padma-Meghna and Ganges-Jamuna River Confluences, Bangladesh

Gazi

Roy

Mia

et al. 2020

KN J. Cartogr. Geogr. Inf.

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Bangladesh is a low-lying riverine country with the mighty Ganges–Brahmaputra–Meghna (GBM) major river system including their abundant tributaries and distributaries. Land erosion–accretion is a very common phenomenon in this riverine country. This process extensively erodes huge productive landmasses at the river confluence zones every year. The main objective of this study was to understand the confluence morpho-dynamics and identify the vulnerable areas near the Padma–Meghna Confluence (PMC) and Ganges–Jamuna confluence (GJC) due to confluence shifting and erosion–accretion phenomenon of those rivers. The present study utilized multi-temporal Landsat satellite images from 1972 to 2019 approximately ten years of interval. Results showed that the PMC indicated frequent variation in migration trend towards NW from 1972 to 1980, SE from 1980 to 2010, and then reversed towards NW direction from 2010 to 2019. On the other hand, the GJC confluence point moved NW direction (2.37 km) from the year 1972 to 1980, but from 1980 to 2019, the confluence shifted towards the SE direction. Due to the migration dynamics, huge changes happened in width and sand bars area of both confluences. In PMC, confluence width increased remarkably indicating erosive flow during 1972–1980, then progressively shortened up to 2019, indicating accretion. In contrast, GJC shows a significant accretional trend over the 47 years. The sand bar area of the PMC increased about 147.09 km2 throughout the study period. But, GJC shows an opposite scenario where the total sand bar area decreased about 51.02 km2 in the same period. From the vulnerability study of erosion–accretion scenarios, it is predicted that Paturia Ferry Ghat area, Aricha Ferry Ghat area, Arua, Baruria, Dashkin Saljana, Bhadiakola, Masundia, Khanganj and Nyakandi areas near GJC and Chandpur sadar, Srimandi, Sakhua, Bilaspur and char Atra near PMC are highly vulnerable zones. The outputs of the study will enable policy makers to take necessary measures to reduce the erosional severity on both confluence zones and could also provide a basis for proper land management.

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“…On the other hand, coal bottom ash (CBA) is regarded as a potential replacement for sand in concrete mixture. CBA can be used for construction purposes as a sand substitute [8,9] and for industrial purposes as alternative filter media [10] applications, amongst other uses. The amount of recycled aggregate is increasing in the world [11].…”

Section: Introductionmentioning

confidence: 99%

Chloride Induced Reinforcement Corrosion in Mortars Containing Coal Bottom Ash and Coal Fly Ash

Menéndez

Argiz

Sanjuán³

2019

Materials

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Coal bottom ash is normally used as aggregate in mortars and concretes. When it is ground, its characteristics are modified. Therefore, the assessment of its long-term durability must be realized in depth. In this sense, an accelerated chloride ingress test has been performed on reinforced mortars made of Portland cement with different amounts of coal bottom ash (CBA) and/or coal fly ash (CFA). Corrosion potential and corrosion rate were continuously monitored. Cement replacement with bottom and fly ash had beneficial long-term effects regarding chloride penetration resistance. Concerning corrosion performance, by far the most dominant influencing parameter was the ash content. Chloride diffusion coefficient in natural test conditions decreased from 23 × 10−12 m2/s in cements without coal ashes to 4.5 × 10−12 m2/s in cements with 35% by weight of coal ashes. Moreover, the time to steel corrosion initiation went from 102 h to about 500 h, respectively. Therefore, this work presents experimental evidence that confirms the positive effect of both types of coal ashes (CBA and CFA) with regard to the concrete steel corrosion.

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Improving the Hydro-Morpho Dynamics of A River Confluence by Using Vanes

Cited by 5 publications

References 50 publications

Geomorphodynamics, evolution, and ecology of vertical roots

Geomorphodynamics, evolution, and ecology of vertical roots

Assessment of Morpho-Dynamics through Geospatial Techniques within the Padma-Meghna and Ganges-Jamuna River Confluences, Bangladesh

Chloride Induced Reinforcement Corrosion in Mortars Containing Coal Bottom Ash and Coal Fly Ash

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