Spatial-temporal correlation-based analysis of multi-source flood coincidence risks: A case study of the middle and lower Yangtze River basin

Journal of Hydrology Regional Studies, Journal Year: 2025, Volume and Issue: 58, P. 102265 - 102265

Published: March 5, 2025

Language: Английский

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Confluence Effects of Dongting Lake in the Middle Yangtze River: Discontinuous Fluvial Processes and Their Driving Mechanisms

Water Resources Research, Journal Year: 2025, Volume and Issue: 61(2)

Published: Feb. 1, 2025

Abstract Confluence‐induced river discontinuities pose several challenges for flood control, navigation, and maintenance of ecological integrity. River‐connected lakes in lowland regions represent a unique type confluence, fulfilling significant floodplain functions fluvial processes forms main streams, yet they remain insufficiently studied. This study utilized Dongting Lake the Middle Yangtze River as representative case to examine confluence effects lake‐type tributary on stream identify key driving factors. The findings revealed that during equilibrium period, both flow frequency curves sediment‐transport rating exhibited segmentation characteristics due river‐lake system. lake amplified behaviors across spatial scales, which inherently depended combination. Following Three Gorges Reservoir impoundment, alterations led recent abnormal local erosion‐deposition adjustments under sediment subsaturation conditions, whereas upstream reservoir regulation dominated long‐term reduction channel‐forming discharge with channel shrinkage trend downstream confluence. Despite altered water‐sediment regimes, inflow qualitatively remains critical factor influencing discontinuity stream. Our research demonstrated hydrological rather than transport, significantly influence alluvial river. insight enhances our understanding evolutionary mechanisms large rivers complex relationships offers important implications management water resource systems.

Language: Английский

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Pluvial flood modeling for coastal areas under future climate change – A case study for Prince Edward Island, Canada

Journal of Hydrology, Journal Year: 2024, Volume and Issue: 641, P. 131769 - 131769

Published: Aug. 5, 2024

It has been increasingly understood that pluvial flooding poses a substantial risk to numerous communities across the globe. This is especially relevant for Canadian province of Prince Edward Island (PEI), which susceptible compound flood consisting both inland and coastal flooding. Despite various studies, comprehensive model still lacks addresses complex interplay floods. Therefore, this research aims bridge gap in mitigation by developing PEI's communities. The Intensity-Duration-Frequency (IDF) curves under current future climatic conditions were used portray rainfall intensity over study area corresponding 10-year, 25-year, 50-year, 100-year return periods. In addition, hydraulic (HEC-RAS 2D) was drive maps based on two configurations, including detailed major municipalities an island-wide level. validated results showed consistency simulation when compared observations. high-resolution produced can support development adaptation strategies PEI other parts world.

Language: Английский

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Spatial and Temporal Variations’ Characteristics of Extreme Precipitation and Temperature in Jialing River Basin—Implications of Atmospheric Large-Scale Circulation Patterns

Water, Journal Year: 2024, Volume and Issue: 16(17), P. 2504 - 2504

Published: Sept. 3, 2024

In recent years, extreme climate events have shown to be occurring more frequently. As a highly populated area in central China, the Jialing River Basin (JRB) should deeply explored for its patterns and associations with climatic factors. this study, based on daily precipitation atmospheric temperature datasets from 29 meteorological stations JRB vicinity 1960 2020, 10 indices (6 4 indices) were calculated. The spatial temporal variations of analyzed using Mann–Kendall analysis, explore correlation between circulation linear nonlinear perspectives via Pearson analysis wavelet coherence (WTC), respectively. Results revealed that among six selected indices, Continuous Dry Days (CDD) Wetness (CWD) showed decreasing trend, tended shorter calendar time, while other four an increasing intensity rainfall frequent. except TN10p, which significant three number low-temperature days decreased significantly, duration high increased, basin was warming continuously. Spatially, variation is obvious, mostly located western northern regions, southern northeastern makes regionalized. Linearly, most index, show trend significance obvious. Except Southern Oscillation Index (SOI), correlations Arctic (AO) has strongest CDD. Nonlinearly, NINO3.4, Pacific Decadal (PDO), SOI are not main dominating changes TN90p, average (SDII), maximum amount (RX1day), 5 (Rx5day) clearly associated patterns. This also confirms tend single relationship, but governed by complex response mechanisms. study aims help relevant decision-making authorities cope frequent JRB, provides reference predicting flood, drought waterlogging risks.

Language: Английский

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Estimating a Coastal Compound Flood Standard for the Taehwa River Basin

Korean Society of Hazard Mitigation, Journal Year: 2024, Volume and Issue: 24(4), P. 217 - 230

Published: Aug. 30, 2024

The risk of coastal compound flood, caused by the interaction rainfall and tides, has been increasing with sea level rise changes in due to climate change. However, there is no costal flood study that considers tides Korea. Therefore, this applied concept Taehwa river basin estimate standard for basin. result revealed occurred when intensity was greater than 22.42 mm/hr tide 0.71 m. In addition, found typhoon plays a role analyzing distribution meteorological oceanographic factors during events. Our results can be used develop disaster management plans prepare flood.

Language: Английский

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