Geomechanical Hazards related to River Hydraulics and Remedial Measures: Selected Case Studies in India

Dutta, Joydeep; Basack, Sudip; Goswami, Ghritartha; Kiron, Bini

doi:10.37394/232013.2021.16.20

Cited by 3 publications

(3 citation statements)

References 11 publications

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“…It is therefore evident that shallower sections of the river channel are characterized by high sand deposition and accumulation. This finding agrees with that by Dutta et al (2021), who found that narrow and deep sections of the river channel are characterized by high speed of the river current since they act as constrictions, a factor that promotes erosion processes as opposed to deposition. Increase in depth of a river channel is usually coupled with increasing slope angle, a factor that discourages deposition.…”

Section: River Channel Depth and Sand Abundancesupporting

confidence: 92%

“…According to Chilikova-Lubomirova (2020), low river channel angles characterizing the convex banks encourage deposition of sand since it facilitates slow movement of water. On the other hand, Dutta et al (2021) pointed out that concave banks are characterized by active erosion, a factor that discourages deposition and accumulation of sand since the slope angles on such banks are high.…”

Section: The Role Of Slope Angles On Sand Abundancementioning

confidence: 99%

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Active morphological factors determining the locations of sand mines in dry-river channels

Muiruri

Obando

Mahiri

2023

EUR J SUSTAIN DEV RES

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In Kenya, most of the construction sand is derived from dry riverbeds. Due to rampant nature in which sand mining is carried out in these rivers, adverse environmental and social effects have been reported. In order to ensure sustainable sand mining activities, this study assessed active morphological factors determining sand abundance in the seasonal river Tyaa in Kitui, Kenya. The study adopted quantitative research design. Purposive sampling was used to select river Tyaa due to uncontrolled sand mining that was taking place there. Systematic sampling at 20 meter intervals was used while collecting data at the stretches of the river channel, thus constituting 2,000 meters in total. Data on independent variables, namely the river channel’s width, depth, slope angles, bank position, weathering status, vegetation status, and erosion status was collected using physical measurements and logic guided observation. Binary logistic regression analysis was used to analyze the data, giving marginal effects and respective p-values. The study established four statistically significant factors responsible for sand abundance in the dry river channel’s namely depth (p=0.001), width (p=0.001), slope angles (p=0.001) and bank position (p=0.001). The study concluded that these factors should be observed while siting sand mines along dry river channels to mitigate adverse environmental effects. The study recommended that National Environmental Management Authority of Kenya should apply the findings of this study in the establishment of the locations of sand mines and monitoring of the mining process in line with the existing guidelines and regulations.

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Section: River Channel Depth and Sand Abundancesupporting

confidence: 92%

Section: The Role Of Slope Angles On Sand Abundancementioning

confidence: 99%

Active morphological factors determining the locations of sand mines in dry-river channels

Muiruri

Obando

Mahiri

2023

EUR J SUSTAIN DEV RES

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“…The increasing population in coastal localities worldwide demands enhancement of freshwater extraction in those regions initiating saltwater interface to advance towards the aquifers, producing saline water intrusion [3]. Such intrusion not only contaminates coastal fresh groundwater resources remarkably making it unsuitable for consumption for domestic, irrigation, and industry usages, but also alters the geotechnical and geohydraulic properties of the aquifer materials affecting their flow characteristics, influencing the pumping and other engineering activities [4][5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Flow Characteristics through Granular Soil Influenced by Saline Water Intrusion: A Laboratory Investigation

et al. 2022

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The coastal geoenvironment initiates saline water intrusion into the freshwater aquifers, producing a geohydraulic problem. Such intrusion not only contaminates the fresh groundwater resources, making them unsuitable for human use, but also alters the hydraulic conductivity of the aquifer materials, which affects the coastal groundwater flow, influencing the water resources planning and management. Past investigations reveal that the groundwater flow can be linear or nonlinear depending upon the hydraulic gradient. Thus, the coefficients of nonlinear hydraulic conductivities are affected by saltwater intrusion. The present study focuses on an in-depth laboratory investigation into the influence of saltwater submergence on the nonlinear flow characteristics through granular soil. The fine sand samples have been submerged under saline water of specified concentrations for a specific duration, and the alteration in their nonlinear geohydraulic properties has been studied. It is observed that the flow characteristics through fine sand are significantly affected by the period of submergence and saline concentration. Appropriate analyses of the test results are performed to interpret the experimental data, and relevant conclusions are drawn therefrom. The novelty of this study is an in-depth analysis of nonlinear flow characterization affected by saline water intrusion. Doi: 10.28991/CEJ-2022-08-05-02 Full Text: PDF

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Assessing the Impacts of Land Use and Land Cover Changes on the Water Quality of River Hooghly, West Bengal, India: A Case Study

et al. 2023

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Rivers are crucial components of human civilization, as they provide water for domestic, agricultural, and industrial use. Additionally, they transport domestic and industrial waste to the sea. The Ganga River is a major river in India, originating from Gangotri in the north, flowing through five provinces, and discharging into the Bay of Bengal. This study examined the impact of land use and land cover changes (LULC) on water quality along the River Hooghly in India. The research involved collecting water samples from different locations and analyzing them in the laboratory to estimate various parameters. The findings indicate that the expansion of built-up and agricultural lands is causing a reduction in tree cover and water bodies, leading to deteriorating water quality. The study highlights the need for sustainable land use practices and improved water management to preserve the river’s ecosystem and maintain water quality. Specifically, the study identified localities in the vicinity of Dakshineshwar, Shibpur, and Garden Reach as particularly vulnerable to water quality deterioration due to LULC changes and population growth. The study’s results provide valuable insights for policymakers and stakeholders in implementing strategies to address the challenges posed by land use changes and population growth.

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Geomechanical Hazards related to River Hydraulics and Remedial Measures: Selected Case Studies in India

Cited by 3 publications

References 11 publications

Active morphological factors determining the locations of sand mines in dry-river channels

Active morphological factors determining the locations of sand mines in dry-river channels

Flow Characteristics through Granular Soil Influenced by Saline Water Intrusion: A Laboratory Investigation

Assessing the Impacts of Land Use and Land Cover Changes on the Water Quality of River Hooghly, West Bengal, India: A Case Study

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