ERTH 2415 Lecture Notes - Lecture 19: Wind Speed, Flash Flood, Drainage Density
19 Jun 2015
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Document Summary
Lecture 19 floods: floods are mainly divided into two groups: hydro meteorological floods and. A portion flows across the surface into the streams called run offs. These sediments are transported on sub ducting plates. Increasing duration of precipitation would result in infiltration. Increasing amount of precipitation would result in run off. Increasing soil saturation would result in run off. Increasing slope steepness would result in run off: drainage basin area of land that conveys all run offs into a particular body of water. Largest drainage basin in the world : amazon drainage basin, largest in. Higher flooding hazard: discharge volume of water flowing in a stream channel per unit time. Discharge = cross sectional area * flow velocity: load sediments transported by a stream. Increasing sinuosity: floods are an integral part of the flow regime of rivers; occasionally water overflows and inundates the flood plain. Controlling factors: snow-pack conditions thickness and extent, level of liquid water saturation.
