Estimating the Peak Outflow and Maximum Erosion Rate during the Breach of Embankment Dam DOI Open Access

Mahmoud T. Ghonim,

Ashraf Jatwary,

M Mowafy

et al.

Water, Journal Year: 2024, Volume and Issue: 16(3), P. 399 - 399

Published: Jan. 25, 2024

Understanding and modeling a dam breaching process is an essential investigation, because it aims to minimize the flood’s hazards, its impact on people structures, using suitable mitigation plans. In current study, three-dimensional numerical carried out FLOW-3D HYDRO program investigate of various factors, including grain size materials, crest width, inflow discharge, tail water depth breach process, particularly peak outflow, erosion rate. The results show that changing material from fine sand medium coarse leads increase in outflow discharge by 16.0% maximum rate 20.0%. Furthermore, increasing width 40% decrease 3.0% rates 4.50%. Moreover, 25.0% increases 23.0% 21.0%. Finally, 50.0% decreasing 4.50% 43.0%. study findings are considered high importance for design operation control. can be applied optimum determination improving stability.

Language: Английский

Synergy of Remote Sensing and Geospatial Technologies to Advance Sustainable Development Goals for Future Coastal Urbanization and Environmental Challenges in a Riverine Megacity DOI Creative Commons
Minza Mumtaz,

Syed Humayoun Jahanzaib,

Waqar Hussain

et al.

ISPRS International Journal of Geo-Information, Journal Year: 2025, Volume and Issue: 14(1), P. 30 - 30

Published: Jan. 14, 2025

Riverine coastal megacities, particularly in semi-arid South Asian regions, face escalating environmental challenges due to rapid urbanization and climate change. While previous studies have examined urban growth patterns or impacts independently, there remains a critical gap understanding the integrated of land use/land cover (LULC) changes on both ecosystem vulnerability sustainable development achievements. This study addresses this through an innovative integration multitemporal Landsat imagery (5, 7, 8), SRTM-DEM, historical use maps, population data using MOLUSCE plugin with cellular automata–artificial neural networks (CA-ANN) modelling monitor LULC over three decades (1990–2020) project future for 2025, 2030, 2035, supporting Sustainable Development Goals (SDGs) Karachi, southern Pakistan, one world’s most populous megacities. The framework integrates analysis SDG metrics, achieving overall accuracy greater than 97%, user producer accuracies above 77% Kappa coefficient approaching 1, demonstrating high level agreement. Results revealed significant expansion from 13.4% 23.7% total area between 1990 2020, concurrent reductions vegetation cover, water bodies, wetlands. Erosion along riverbank has caused Malir River’s decrease 17.19 5.07 km2 by highlighting key factor contributing flooding during monsoon season. Flood risk projections indicate that urbanized areas will be affected, 66.65% potentially inundated 2035. study’s contribution lies quantifying achievements, showing varied progress: 26% 9 (Industry, Innovation, Infrastructure), 18% 11 (Sustainable Cities Communities), 13% 13 (Climate Action), 16% 8 (Decent Work Economic Growth). However, declining bodies pose 15 (Life Land) 6 (Clean Water Sanitation), 11%, respectively. approach provides valuable insights planners, offering novel adaptive planning strategies advancing practices similar stressed megacity regions.

Language: Английский

Citations

2
Urbanization alters the diversity, assembly, and complexity in microbial communities of a subtropical river system DOI
Teng Zhao, Yuting Deng,

Ling Zhou

et al.

Hydrobiologia, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 23, 2025

Language: Английский

Citations

0
Urbanization alters the diversity, assembly and complexity in microbial generalist and specialist community of a subtropical river system DOI Creative Commons
Teng Zhao, Yuting Deng,

Ling Zhou

et al.

Research Square (Research Square), Journal Year: 2024, Volume and Issue: unknown

Published: June 17, 2024

Abstract Urbanization-induced environmental changes are becoming a major threat to river systems. However, little is known about how urbanization affects aquatic microbial communities despite their critical role in maintaining ecological processes and nutrient cycling. Here, we investigated assembly of habitat generalists specialists different stages subtropical rivers. The results highlight that nitrogen compounds can influence the composition community. Proteobacteria Bacteroidetes, as well Cyanobacteria were identified dominant phyla Both total diversity species richness significantly higher than specialists, while beta was low-level rivers (LUS) high-level (HUS). For generalist, heterogeneous selection most important process for HUS winter, but dispersal limitation, drift other nondominated mainly establishment LUS whether summer or winter. Similarly, stochastic main HUS, In winter LUS, more complex network found stronger complexity robustness co-occurrence compared HUS. Overall, these suggest play key shaping urbanization-induced homogenization communities. insights gained from this study may be helpful understanding mechanisms.

Language: Английский

Citations

1
On mapping urban community resilience: Land use vulnerability, coping and adaptive strategies in Ghana DOI Creative Commons
Abdul-Salam Ibrahim, Vincent Z. Kuuire, Thembela Kepe

et al.

Journal of Environmental Management, Journal Year: 2024, Volume and Issue: 370, P. 122426 - 122426

Published: Sept. 8, 2024

Language: Английский

Citations

1
Estimating the Peak Outflow and Maximum Erosion Rate during the Breach of Embankment Dam DOI Open Access

Mahmoud T. Ghonim,

Ashraf Jatwary,

M Mowafy

et al.

Water, Journal Year: 2024, Volume and Issue: 16(3), P. 399 - 399

Published: Jan. 25, 2024

Understanding and modeling a dam breaching process is an essential investigation, because it aims to minimize the flood’s hazards, its impact on people structures, using suitable mitigation plans. In current study, three-dimensional numerical carried out FLOW-3D HYDRO program investigate of various factors, including grain size materials, crest width, inflow discharge, tail water depth breach process, particularly peak outflow, erosion rate. The results show that changing material from fine sand medium coarse leads increase in outflow discharge by 16.0% maximum rate 20.0%. Furthermore, increasing width 40% decrease 3.0% rates 4.50%. Moreover, 25.0% increases 23.0% 21.0%. Finally, 50.0% decreasing 4.50% 43.0%. study findings are considered high importance for design operation control. can be applied optimum determination improving stability.

Language: Английский

Citations

0