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原文传递 Evaluation of Dam Decommissioning in an Ice-Affected River: Case Study.

题名：	Evaluation of Dam Decommissioning in an Ice-Affected River: Case Study.
作者：	vuyovich, c. m. white, k. d.
关键词：	thickness, united states, removal, risk, jamming, rivers, villages, bridges, north(direction), structural properties, water, surfaces, profiles, case studies
摘要：	Many dams across the United States are being decommissioned as a result of structural deficiencies or a desire to restore fish passage and to restore the natural stream. On northern rivers, darn removal affects the river ice processes and can result in increased ice jams and ice jams-related flooding. An analysis of the river system prior to darn removal is often necessary to ensure that increased ice jams, flooding, and damages do not result. This case study presents the types of analyses needed to investigate the ice impacts of the potential removal of the Merrimack, Village Darn on the Souhegan River in Merrimack,, New Hampshire. Of particular interest were the potential impacts to the historic Chamberlain Bridge. A HEC-RAS hydraulic model was used to estimate the ice jam thickness and resulting water surface profiles with and without an ice jam in place for both the pre- and post-darn-removal conditions. The results of this analysis indicate that removing the Merrimack Village Darn will not pose significant risk to the Chamberlain Bridge or to the area downstream. / NOTE: Final rept. / Availability Note: Available on CD-ROM and in color paper copy only. Order this product from NTIS by: phone at 1-800-553-NTIS (U.S. customers); (703)605-6000 (other countries); fax at (703)605-6900; and email at orders@ntis.gov. NTIS is located at 5285 Port Royal Road, Springfield, VA, 22161, USA.
总页数：	u0810；45p
报告类型：	科技报告