Pool Lowering at Lock and Dam 1 Using the Lock Filling and Emptying System, Mississippi River, Minnesota
Abstract
The purpose of this study is to determine what limitations must be placed on the use of the lock culvert system if used as a means of pool drawdown. Guidelines and operation procedures must be developed and documented to provide instruction for lock operators for lock culvert valve operation during an emergency. The hydraulic model study (Ables 1979) found that low pressures exist in the lock culvert during the unsteady flow of lock operations. The steady flow obtained during pool lowering could produce even lower pressures, which might induce cavitation in the culvert filling and emptying system. These conditions must be considered in any potential long-term operation of the lock system for releases other than normal lock operation. A numerical model study of the lock system would provide information for simulations of different head and tailwater conditions. Discharge and pressures for steady-state flows requires model validation with prototype data for similar operating conditions. Information needed for numerical model validation were the upper and lower pool elevations, gate position, and lock culvert soffit pressures downstream of the filling and emptying valves.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 2001
- Accession Number
- ADA392082
Entities
People
- Richard L. Stockstill
- Terry N. Waller
- Timothy L. Fagerburg
Organizations
- Engineer Research and Development Center