Multi-Source Dynamic Graph Learning for Compound-Flood Forecasting in Managed Coastal Systems

• URL: http://arxiv.org/abs/2608.01775v1
• Date: Mon, 03 Aug 2026 06:48:32 GMT
• Title: Multi-Source Dynamic Graph Learning for Compound-Flood Forecasting in Managed Coastal Systems
• Abstract summary: Compound flooding in managed coastal systems is influenced by hydrological conditions and water-management activity observed across multiple monitoring stations.<n>Current forecasting models can capture temporal dependencies with low average errors, but global error metrics may conceal poor reproduction of prolonged high-water plateaus.<n>This work proposes an anchored forecasting framework that incorporates cross-site information through state- and lead-dependent bounded residual corrections.
• Score: 14.68802969969726
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Compound flooding in managed coastal systems is influenced by hydrological conditions and water-management activity observed across multiple monitoring stations. Current forecasting models can capture temporal dependencies with low average errors, but global error metrics may conceal poor reproduction of prolonged high-water plateaus that are relevant to flood early warning. Because hydrometeorological and operational signals are distributed across heterogeneous gages, single-site records do not fully represent high-water dynamics. Nevertheless, unconstrained fusion of cross-site signals can degrade the stability of local temporal forecasts. This work proposes an anchored forecasting framework that incorporates cross-site information through state- and lead-dependent bounded residual corrections. A multi-source regime representation constructed from hydrometeorological and operational observations adaptively calibrates inter-site relationships and correction scales, enabling targeted cross-site adjustment while preserving the local temporal forecast as a stable anchor. Beyond conventional global error statistics, we evaluate event-scale high-water characteristics through the temporal alignment of forecasted and observed high-water processes. Experiments demonstrate that selectively integrating multi-station dynamic conditions improves the prediction reliability of sustained high-water plateaus while maintaining high accuracy during routine hydrological conditions, supporting flood early warning and water-management decision support.

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