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Title:

SNOWMELT AND LOGGING INFLUENCE ON PIEZOMETRIC LEVELS IN STEEP FORESTED WATERSHEDS IN IDAHO

Accession Number:

00394984

Record Type:

Component

Availability:

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Order URL: http://worldcat.org/isbn/0309037220

Abstract:

This study was designed to evaluate the effects of clear-cut logging on piezometric levels caused by subsurface flow on steep granitic slopes in the mountains of Idaho. Data were collected on control and treated watersheds both before and after logging. Wildfire burned over both study watersheds less than 1 year after logging. Data collection included a complete weather station adjacent to the study watersheds plus two snow lysimeters, a sample grid of 52 snow stakes for measuring snow-water equivalent, and 25 crest gauge piezometers located on the study watersheds. Snowmelt was the primary factor influencing piezometric levels. Instantaneous and mean daily snowmelt rates were poor predictors of peak levels. Average ablation rates from the time of maximum snow accumulation to the time of disappearance of the snowpack were closely correlated with maximum and average piezometric levels. Logging influenced levels by increasing snow accumulation and melt rates and by changing snow distribution. Maximum and average piezometric levels were increased 41 and 68 percent, respectively, by logging. The data suggest that the frequency of occurrence of maximum levels was increased by up to 10 times by the clearcut logging activities.

Supplemental Notes:

Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved. Publication of this paper sponsored by Committee on Engineering Geology.

Monograph Accession #:

01419848

Authors:

Megahan, Walter F

Editors:

Kassabian, Naomi

Pagination:

pp 1-8

Publication Date:

1984

Serial:

Transportation Research Record

Issue Number: 965
Publisher: Transportation Research Board
ISSN: 0361-1981

Conference:

63rd Annual Meeting of the Transportation Research Board

Location: Washington District of Columbia, United States
Date: 1984-1-16 to 1984-1-20

ISBN:

0309037220

Media Type:

Print

Features:

Figures (10) ; Maps (1) ; References (20) ; Tables (1)

Geographic Terms:

Idaho

Old TRIS Terms:

Idaho

Subject Areas:

Bridges and other structures; Geotechnology; Highways; Hydraulics and Hydrology; I42: Soil Mechanics

Files:

TRIS, TRB

Created Date:

Nov 30 1985 12:00AM

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