科学素养与生活应用·英语30篇（4）

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山涧溪流为何在降雨峰值后加速：汇流延迟与地形响应

Mountain streams rarely peak at the same time as local rainfall due to travel time delays.
Water moves slowly through soil, rock fractures, and forest litter before reaching stream channels.
Steep slopes accelerate surface runoff, but subsurface flow dominates initial response phases.
Peak stream velocity occurs hours later when accumulated groundwater surges into channels.
Geographic Information Systems model terrain curvature to predict where and when flow peaks occur.
Sensors embedded in streambeds record pressure changes linked to rising water volume and speed.
Forests reduce peak flow intensity by absorbing rainwater and releasing it gradually.
Urbanization replaces permeable ground with pavement, shortening delay times and increasing flood risk.
Hydrologists combine radar rainfall data with elevation maps to improve flash flood warnings.
Understanding this timing helps design better reservoir release schedules during storms.