UID:
kobvindex_GFZ20191009151313
Umfang:
vi, 39 Seiten
,
Illustrationen
Serie:
CRREL Report 76-31
Inhalt:
Sections in the Connecticut River where ice jam potential is high were identified through the use of low-altitude black and white photographs taken during low-flow, ice-free conditions. The hydraulics and mechanics of ice jam initiation were investigated in the river reach where these sections were identified. Certain areas were found in the river that had a high susceptibility to ice clogging, but this high potential decreased with increasing discharge because of the improved surface conveyance of the ice through the reach. The stability of ice floes was established along the channel, but the floes generally became unstable as the flow increased. This was calculated by using a Froude number criterion. Grounding locations for ice became evident when the critical Froude number was zero for a given thickness and water depth. No single factor was determined to be responsible for initiating the ice jams in the Connecticut River at Windsor. Apparently there existed a multitude of interacting conditions: surface constrictions, possible high backwater conditions from the Brattleboro Dam, a solid ice cover in the backwater of the Brattleboro Dam that prevented ice transport from the Windsor area, deep pools followed by shallow depth sections upstream of bridge piers, a greater ice thickness accumulation of fragmented floes than would result if a uniform cover could be established in the same reach, and the diurnal fluctuation of river stage casued by the release of water at Wilder Dam.
Anmerkung:
CONTENTS
Abstract
Preface
Summary
Conversion factors: U.S. customary to metric units of measurement
Introduction
Testsite
Aerial photography
Channel morphology — Interpretation of aerial photographs
Ground surveys
Hydraulic analysis
Analysis of ice jam locations
Winter field observations
Conclusions
Literature cited
Appendix: Locations and plots of cross sections from Sumner Falls to Chase Island, Connecticut River
In:
CRREL Report, 76-31
Sprache:
Englisch
Schlagwort(e):
Forschungsbericht
URL:
https://hdl.handle.net/11681/9535
