Cumulative impacts of interbasin water transfer and salinity intrusion on water security in central Vietnam.

Saltwater intrusion poses a significant threat to freshwater availability in downstream regions globally, leading to economic losses, compromised water supply, reduced agricultural productivity, social instability, and environmental degradation. This study assesses the extent and drivers of salinity intrusion in the downstream areas of the Vu Gia Thu Bon River basin, central Vietnam, with a particular focus on Da Nang City. The analysis considers the impacts of upstream dam operations and inter-basin water transfers on water supply and irrigation, encompassing both direct and indirect damages.

Machine learning-supported quantification and characterization of sediment plastic debris in an Anthropized Mfoundi River in Cameroon: Implications for the incidence of flood events.

The emergence of plastic pollution as a global threat to both terrestrial and aquatic organisms has seen efforts geared toward minimizing its production and monitoring widespread distribution within the ecosystem. Though with distinct characteristics and sources, plastic debris and sediments often interact in the natural environment through a complex relationship, forming "sediment plastic debris" (SPD) which leaks into the riverine system through human actions or elements of nature. Quantifying SPD in riverine environments is therefore essential for understanding the extent of pollution and its ecological impacts.

Long-term assessment of hydropeaking and cumulative impacts on sediment transport, grain size dynamics, channel stability and water resource management.

Hydropeaking refers to rapid and frequent changes in flow discharge and water levels caused by the operation of hydropower dams. This phenomenon is driven by the need to meet fluctuating electricity demands, with water being released or stored to generate power as needed. High energy demand leads to hydropeaking, significantly impacting water resource management in downstream areas.

Environmental pressures on livelihood transformation in the Vietnamese Mekong Delta: Implications and adaptive pathways.

Environmental pressures have significantly impacted agricultural land use in deltas worldwide, leading to transformative changes in livelihoods. The Vietnamese Mekong Delta (VMD) is a vital region for national food security and global agricultural markets but is threatened by climate change, hydropower dams, sand mining, and excessive groundwater extraction. These pressures challenge the VMD's agricultural productivity and sustainability in the Anthropocene era.

Comprehensive assessment of cascading dams-induced hydrological alterations in the lancang-mekong river using machine learning technique.

The development of cascading hydropower dams in river basins has significantly altered natural flow regimes in recent decades. This study investigates hydrological alterations caused by cascading hydropower dams in the Lancang-Mekong River Basin (LMRB) by integrating the Indicators of Hydrologic Alteration (IHA) method with non-regulated flow predicted using the Random Forest (RF) machine learning (ML) technique. The analysis focuses on four hydrological stations: Chiang Saen, Mukdahan, Pakse, and Stung Treng across pre-impact (1961-1991), transition (1992-2008), and post-impact (2009-2021) periods.

Recurrence interval of riverbed sand mining hotspots in the Mekong delta: Potential indications of unsustainable replenishment rates.

Rampant and illegal river sand mining in the Vietnamese Mekong Delta (VMD) has led to substantial sediment losses and bank erosion. However, regulation of this issue remains a significant challenge due to insufficient monitoring and enforcement efforts, partly attributed to limited data and technology. To support an improved monitoring system in the VMD, this study investigates the spatiotemporal changes in sand mining hotspots and their underlying drivers.

An assessment of uncontrolled human interventions on the contemporary sediment budget and morphological alterations of the Vu Gia Thu Bon River basin, central Vietnam.

The Vu Gia Thu Bon (VGTB) River basin is critical for regional development and prosperity in water resources. However, human interventions (e.g.

Quantifying the consequences of unsustainable sand mining and cascade dams on aspects in a tropical river basin.

Human interventions at the river basin scale, such as sand mining and hydropower dam construction, have profoundly affected hydrological and hydraulic alteration regimes, sediment budgets, and morphological changes worldwide. Quantifying the consequences of unsustainable ongoing sand mining and hydropower is crucial for obtaining sediment load data and managing hydrogeomorphology. In this study, comprehensive long-term consecutive four-field monitoring, statistical methods, and hydrological models (SWAT) were applied to quantify the spatiotemporal changes in long-term discharge and sediment load from 1996 to 2020 for the tropical river of the Vu Gia Thu Bon (VGTB) in the central region of Vietnam.

Urban flood numerical modeling and hydraulic performance of a drainage network: A case study in Algiers, Algeria.

Urban sewer system management is challenging due to its higher vulnerability to flooding caused by rapid urbanization and climate change. For local decision-makers, storm water management is essential for urban planning and development. Therefore, the main objective of this study is to develop a numerical model for the sewerage network of the central catchment area of Algiers since it has experienced frequent overflows during the winter season.

Influence of different skew angles of the submerged vane on pressure flushing performance.

Siltation significantly threatens a reservoir's original storage capacity and lifespan. Pressure flushing is an effective measure against siltation through the partial drawdown of the reservoir water level with limited flushed cone volumes in front of the bottom outlet. In this study, a novel configuration with submerged vanes has been proposed and tested experimentally to increase the flushed sediment volume during pressure flushing.

Assessing the effectiveness of nature-based solutions-strengthened urban planning mechanisms in forming flood-resilient cities.

Cities have experienced rapid urbanization-induced harsh climatic events, especially flooding, inevitably resulting in negative and irreversible consequences for urban resilience and endangering residents' lives. Numerous studies have analyzed the effects of anthropogenic practices (land use changes and urbanization) on flood forecasting. However, non-structural mitigation's effectiveness, like Nature-Based Solutions (NBS), has yet to receive adequate attention, particularly in the Middle East and North Africa (MENA) region, which have become increasingly significant and indispensable for operationalizing cities efficiently.

Local flow convergence, bed scour, and aquatic habitat formation during floods around wooden training structures placed on sand-gravel bars.

Riverine ponds, which are formed and sustained through sediment erosion and deposition, are key habitats for enhancing biodiversity in river reaches. The objective of this study was to understand the roles of traditional river-training wooden structures called "seigyu" on the formation of ponds on nonvegetated bars. Here, the spatial and temporal patterns of the flow and bedform coupled with pond formations for several flood events were assessed.

Channel formation during flushing of large shallow reservoirs with different geometries.

Depositional and flow patterns are first described to gain an understanding of the erosion patterns during hydraulic flushing in a reservoir. Considering the importance of this issue, two modes of flushing operation for control of sedimentation were performed in several experiments with different reservoir geometries. In order to investigate the effect of flushing and the effectiveness during free and drawdown flows, ten experiments have been conducted.