Review of the Probable Maximum Flood (PMF) Snowmelt Analysis for Success Dam

This report reviews the initial snowpack distribution assumed to be in place and available for melt in the probable maximum flood (PMF) analysis of Success Dam conducted by the Corps of Engineers. This project reviewed two aspects of the initial snow distribution: the snow-covered area (SCA) distrib...

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Bibliographic Details
Main Author: Daly, Steven F
Other Authors: ENGINEER RESEARCH AND DEVELOPMENT CENTER HANOVER NH COLD REGIONS RESEARCH AND ENGINEERING LAB
Format: Text
Language:English
Published: 2015
Subjects:
Hydrology
Limnology and Potamology
Snow
Ice and Permafrost
Civil Engineering
*DAMS
*FLOODING
*SNOW COVER
DISTRIBUTION
MELTS
MODELS
REMOTE DETECTION
RUNOFF
SATELLITE IMAGERY
SCENARIOS
TEMPERATURE
TOPOGRAPHY
WATERSHEDS
MODIS TERRA SNOW COVER DAILY L3 GLOBAL 500 M GRID
*PMF(PROBABLE MAXIMUM FLOOD)
SNOW MELT
SNOW MODELING
SCA(SNOW-COVERED AREAS)
SWE(SNOW-WATER EQUIVALENT)
*SUCCESS DAM WATERSHED
AIR TEMPERATURE
Ice
permafrost
Online Access:http://www.dtic.mil/docs/citations/ADA624268
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA624268
Description
Summary:This report reviews the initial snowpack distribution assumed to be in place and available for melt in the probable maximum flood (PMF) analysis of Success Dam conducted by the Corps of Engineers. This project reviewed two aspects of the initial snow distribution: the snow-covered area (SCA) distribution and the snow water equivalent (SWE) distribution. We analyzed satellite imagery to determine the daily SCA of the Success Dam watershed from 2000 to 2014. This analysis was based on time-domain filtering of NASA's daily snow product. The SCA of the Success Dam watershed is highly dynamic with large day-to-day variations. The maximum 95th percentile SCA for each elevation band was selected to describe the initial snow cover in place at the start of the PMF analysis. We next reviewed the initial SWE distribution. Above 5000 ft, the initial SWE distribution was greater than the snowmelt that occurred during the PMF and was therefore heat transfer limited. In this region the snowmelt runoff during the PMF was insensitive to the amount of SWE. Below 5000 ft, the snowmelt was limited by the initial SWE. Runoff from this region is sensitive to the amount of initial SWE. The original document contains color images.

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