UID:
kobvindex_GFZ20190905152121
Format:
v, 58 Seiten
,
Illustrationen
Series Statement:
CRREL Report 93-3
Content:
Results are presented of a study to determine appropriate methods of flow modification for mitigating ice jam formation in navigable rivers. Based on a review of alternative methods for flow modification, it is concluded that for many rivers, especially large ones, the most appropriate method involves controlled ice-cover formation through the regulation of river flow. Flow discharge and stages would be regulated by controlling the flow releases from reservoirs and flow stages at river dams, such that optimal flow conditions prevail for rapid formation, and subsequent maintenance, of an accumulation ice cover over river reaches in which potentially large amounts of frazil ice may grow. Accumulation covers would be formed of frazil ice pans and floes and, if appropriate, broken ice conveyed from upstream. Existing dams, augmented where needed by navigable ice booms, could serve as retention structures for the development of accumulation covers. A preliminary indication of the feasibility of this method for controlling ice-cover formation on stage-regulated pools of the Ohio River is assessed through the use of a numerical model that simulates ice-cover formation from frazil ice. It is found that this approach holds promise for mitigating jam occurrence, although its implementation necessarily entails management of flow through major portions of the Ohio River. The results of the study are, to a limited extent, generalized to other rivers.
Note:
CONTENTS
Preface
Nomenclature
Introduction
Background
Scope of the study
Control of river ice formation
Control methods
Controlled ice-cover formation for the upper Ohio River
Numerical simulation of ice-cover formation
Flow profile
Water temperature variation
Frazil ice growth
Ice-cover progression
Thermal growth of ice cover
Numerical results
Illustration of simulated ice-:over formation
Ice-cover formation in the Hannibal and Montgomery pools
Generalized results
Conclusions and recommendations
Literature cited
Appendix A: Expression for coefficients
Appendix B: Listing of computer program
In:
CRREL Report, 93-3
Language:
English
Keywords:
Forschungsbericht
URL:
https://apps.dtic.mil/docs/citations/ADA266409
URL:
https://hdl.handle.net/11681/9155
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