21 - GEOL 0820 Ramsey Natural Disasters Spring 2011...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: GEOL 0820 Ramsey Natural Disasters Spring, 2011 LECTURE #21: Flood Monitoring/Mitigation Date: 12 April 2011 I. Monitoring • stream gages o talked about this last week when we looked at hydrographs in lecture and the recitation o system of devices on most large creeks, streams, rivers o operated by the USGS o example: current conditions at the Red River, ND (below) o relatively simple design ¡ not in the river channel but connected to it through several inlet pipes ¡ pipes empty into a well where the water level is the same as the river level at the time ¡ water level is monitored by a float ¡ data are recorded on a local storage device (hard drive) ¡ data also transmitted real time using either short-wave or cell phone networks • use of satellite imagery • example: 1993 Midwest Floods o greatest in recorded history o displacement of jet stream o 150% of normal rainfall over large area of US ¡ heaviest in headwater regions of Missouri and Mississippi Rivers ¡ coupled with lack of typical mid-winter thaw Page 1/5 o...
View Full Document

This note was uploaded on 01/05/2012 for the course GEOL 0820 taught by Professor Ramsay during the Spring '08 term at Pittsburgh.

Page1 / 5

21 - GEOL 0820 Ramsey Natural Disasters Spring 2011...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online