Lecture notes in civil engineering, Год журнала: 2024, Номер unknown, С. 91 - 103
Опубликована: Янв. 1, 2024
Язык: Английский
Water, Год журнала: 2023, Номер 15(9), С. 1793 - 1793
Опубликована: Май 7, 2023
Illegal sand mining has been identified as a significant cause of harm to riverbanks, it leads excessive removal from rivers and negatively impacts river shorelines. This investigation aimed identify instances shoreline erosion accretion at illegal sites along the Chambal River. These were selected based on report submitted by Director National Sanctuary (NCS) Green Tribunal (NGT) India. The digital analysis system (DSAS v5.1) was used during elapsed period 1990 2020. Three statistical parameters in DSAS—the change envelope (SCE), endpoint rate (EPR), net movement (NSM)—quantify rates changes form patterns. To carry out this study, Landsat imagery data (T.M., ETM+, OLI) Sentinel-2A/MSI 2020 analyze accretion. normalized difference water index (NDWI) modified (MNDWI) detect riverbanks satellite images. results indicated that observed all sites, with highest 1.26 m/year Sewarpali site. On other hand, Chandilpura site, 0.63 m/year. We shorelines unmined sites. Erosion are recorded −0.18 0.19 m/year, respectively, which minor compared study’s findings effects will be helpful sustainable management conservation ecosystems. can also help develop implement policies protect ecosystems long-term mining.
Язык: Английский
Процитировано
31
Scientific Reports, Год журнала: 2023, Номер 13(1)
Опубликована: Июнь 28, 2023
The present work experimentally analyses the flow behaviour near T-shaped spur dike field with no seepage, 5%, and 10% downward seepage. Experiments were aimed at analysing channel morphology different discharges. According to results, seepage movement causes significant modification in channels bed elevation development of scour depth. maximum depth is observed edge first facing flow. rate scouring also increases effect Due distribution shifted bed. However, boundary attained some velocity, significantly enhancing sediment transport rate. wake zone between dikes saw very low-velocity magnitudes positive negative values. This reveals secondary current generation inside loop cross-stream circulation. With an increment percentage, Reynold shear stress, turbulent kinetic energy magnitude rise close channel's boundary.
Язык: Английский
Процитировано
12
Physics of Fluids, Год журнала: 2023, Номер 35(6)
Опубликована: Июнь 1, 2023
Channel dredging has become a common phenomenon across several fluvial systems. Pits dredged in the riverbank can influence downstream turbulence and affect bank slope central channel morphodynamics. Erodible bed experiments were conducted laboratory flume having cross section with three different slopes, i.e., 25°, 31°, 40° without mining pit. Flow over near toe was most affected by pit excavation at upstream. Turbulence levels amplified within flow toe. The logarithmic scaling range of higher-order fluctuations is greater for case. complex interaction simultaneous processes like migration, sliding failure erosion, erosion studied multiple length scales time scales. A wavelet correlation analysis used to calculate celerity bedform migration along flow. Statistical bedforms smaller (up 15 mm scales) significantly higher due interaction. study reveals that instream notable effects on inherent nature statistics, especially toe, as well multiscale morphological structures.
Язык: Английский
Процитировано
10
International Journal of Civil Engineering, Год журнала: 2023, Номер 22(1), С. 75 - 85
Опубликована: Авг. 30, 2023
Язык: Английский
Процитировано
9
Scientific Reports, Год журнала: 2024, Номер 14(1)
Опубликована: Май 16, 2024
The present work investigates the combined effects of upstream sediment mining pit and vegetation on riverbank using emergent rigid beyond toe flow structure morphological changes due to fluvial erosion. A steep gradient streamwise velocity other turbulence parameters such as Reynolds shear stress (RSS), transverse RSS, turbulent kinetic energy (TKE) at interface vegetated unvegetated part test segment was observed. cross-sectional analysis showed that increased main channel, sandpit even near-bed with a similar trend in its longitudinal variation center line channel. abrupt RSS location berm induces instability erodes riverbank. combination led TKE locations. complete erosion both cases riverbank, i.e., without or an pit. installed stems helped decrease profile observed minimal over length segment. However, channel amplified (in no-pit case) beginning segment, which eroded bed by about 67% thickness. Also, cases, caused increase 7.66% study helps establish hypothesis negating bank location, performed well maintaining profile.
Язык: Английский
Процитировано
3
ISH Journal of Hydraulic Engineering, Год журнала: 2025, Номер unknown, С. 1 - 14
Опубликована: Янв. 9, 2025
Turbulence is a chaotic flow phenomenon that requires immediate attention in fluvial hydraulics. Its pivotal factors influence river processes, including sediment transport, riverbed morphology, hydraulic structures, flood risk assessment, habitat. This study presents comprehensive bibliometric review of turbulence modelling hydraulics, focusing on sustainable management practices. Employing mixed-method approach, systematic literature following PRISMA guidelines, analysis using VOS-viewer, and qualitative assessment selected studies. The analysis, based 364 documents from the Scopus, reveals prominent journal sources, research themes, active countries field. Our findings highlight 'sediment transport' as influential keyword, indicating its role hydraulics research. 21 provides insights into performance applicability models, RANS, LES, hybrid approaches, scenarios. While RANS particularly k–ε k–ω variants, remain widely used, LES shows promise for complex structures phenomena. identifies gaps, limited adoption RANS-LES models need improved closures secondary prediction. unravels prevailing trends, recognise significant contributors, evaluate basic concepts management.
Язык: Английский
Процитировано
0
Scientific Reports, Год журнала: 2025, Номер 15(1)
Опубликована: Март 26, 2025
Unregulated sediment dredging near riverbanks considerably increases the risk of bank failures. This study examines how proximity mining pits influences riverbank stability by conducting controlled laboratory flume experiments on three slopes: 25°, 31°, and 40°. The analysis considers scenarios—upstream pit, instream no-pit conditions while evaluating key hydraulic parameters, including mean streamwise velocity, Reynolds shear stress (RSS), turbulent kinetic energy (TKE). These measurements provide insights into flow dynamics, turbulence characteristics, morphological changes. results indicate that steeper slopes experience higher erosion risks. 40° slope exhibits velocity up to 35% TKE peaks reaching 40% above baseline levels when a pit is in close proximity, leading severe toe scouring detachment. In contrast, 25° maintains equilibrium, limiting 15% experiencing minimal turbulence-induced erosion, making it most stable configuration for reducing mining-related impacts. 31° slope, corresponding angle repose, strikes balance between mobility but requires localized reinforcements mitigate erosion. findings highlight need well-regulated practices targeted stabilization strategies reduce growing
Язык: Английский
Процитировано
0
Water Science, Год журнала: 2024, Номер 38(1), С. 172 - 191
Опубликована: Фев. 29, 2024
The successful stabilization of riverbanks and the construction sustainable foundations, extensive knowledge scour process accurate assessment depth around spur dikes are required. This study focuses on optimizing dike shape to manage flow turbulence effectively minimize local while considering impact downward seepage. investigation was conducted within an experimental flume featuring a mobile bed under clear water regime provision for concentrated three distinct shapes (T, L, rectangular) different seepage velocities (VS1 VS2) no-seepage condition. current also illustrates changes in morphology, temporal evolution longitudinal profile with without results reveal that intensifies motion sediment particles, more leads escalated particle detachment, resulting deeper depressions. T-shaped exhibited lowest depths compared other shapes, both negative velocity RSS magnitude observed at near channels where maximum achieved. phenomenon is closely linked horseshoe vortices' formation generation. These factors play pivotal role detachment particles from base structure.
Язык: Английский
Процитировано
3
Ecohydrology, Год журнала: 2024, Номер 17(5)
Опубликована: Апрель 29, 2024
Abstract Sediment dredging has been an ever‐growing issue, especially in developing nations with high demand for concrete filler material. River systems are adversely affected by sediment mining, resulting decreased stability of the riverbed and riverbanks. Nature‐based solutions riverbank erosion have a research topic that led to proposal vegetation on However, little is known about extent required negate devastating effects mining because dense severely affects flow structure becomes waste trap. This experimental study uses sparsely dense, flexible, bladed annulment against existing pit. Near‐bed turbulence transport increased test section presence The increase near‐bed streamwise transverse Reynolds shear stresses helped us understand movement lateral directions. morphology showed at beginning segment. entire cross‐section was levelled end section, aggradation downstream In contrast, vegetated case, initial profile bank almost unchanged same discharge upstream sand sparse overperformed intended negation effects. establishes would perform better maintaining channel morphology, which otherwise faced rate main while giving protection
Язык: Английский
Процитировано
2
Hydrology, Год журнала: 2024, Номер 11(9), С. 139 - 139
Опубликована: Сен. 4, 2024
This study presents a comprehensive bibliometric analysis of research on bank erosion and control measures, utilizing the Scopus database VOSviewer software. Key terms such as “bank”, “erosion”, “control”, “protection” frequently appear in literature, underscoring their importance studies riverbank erosion. Since 2000, scientific production has steadily increased, particularly disciplines Environmental Sciences Earth Planetary Sciences, driven by growing concerns about climate change sustainable water resource management. Countries with substantial resources, United States China, lead studies, reflecting commitment to addressing this global issue. In parallel, evaluation mitigation practices Colombia revealed that, although effective techniques gabion walls riparian vegetation exist, 40% respondents do not implement specific measures. lack implementation is attributed insufficient knowledge, limited misconceptions effectiveness these techniques. The findings highlight need promote proven enhance professional training. Future should focus developing more accurate predictive models, integrating interdisciplinary approaches, assessing impacts Addressing barriers applying at local level improving access resources knowledge are critical steps reducing ensuring
Язык: Английский
Процитировано
2