Improved Operations of Mohawk River Movable Dams

Transcription

1 Improved Operations of Mohawk River Movable Dams Kenneth Avery 1, Emily Herbst 1, Michael Thiemann 2, Joe Savoie 3 1 Bergmann Associates; 2 Riverside Technology, inc; 3 New York State Canal Corporation

2 Advanced Forecasting for the New York State Canal System Series of Presentations 1. A Collaborative Approach 2. Collaborative Hydraulic Model Development and Onsite Testing 3. Improved Operations of Mohawk River Movable Dams 4. Inundation Mapping and Data Dissemination

3 Outline Description of movable dams Seasonal operations of movable dams Flood event operations of movable dams Flood Warning Operations System (FWOS) Testing of movable dam gate lifting procedures Historic flood event modeling to test gate lifting procedures Implications of modeling results on lifting procedures

4 New York State Erie Canal Overview 524 miles long Mohawk River 10 Movable Dams(1918) Canalized the river

5 Purpose of Movable Dams Allows the Canal Corp. to seasonally use the Mohawk River as a navigable channel for the Canal system 10 movable dams provide a total of 105 feet of lift Natural River Bed Profile Canalized River Bed Profile

6 Movable Dam

7 Movable Dam Operation Superstructure Mule Upright Upper Gate Upstream Pool Lower Gate Downstream Pool

8 Movable Dam Operation Winter to Navigation Season (1) LOWER UPRIGHTS (2) LOWER LOWER GATES (3) LOWER UPPER GATES

9 Movable Dam Operation Navigation Season Operations +/-2 ft Navigation Range RAISE UPPER GATE(S) LOWER GATES AND UPRIGHTS REMAIN IN PLACE THROUGHOUT THE NAVIGATION SEASON

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11 When do Operations of the Movable Dams Occur? Seasonal Winter shutdown of the Canal (start of non-navigation season) Spring opening of the Canal (start of navigation season) Flood Events Currently when > 10 year recurrence interval flood is predicted to occur at one of three Northeast River Forecast Center (NERFC) gages in the basin. Future when out of bank flooding is projected to occur upstream of any of the movable dams.

12 Adverse Effects of Movable Dams During Flood Events Prior to the gate and hoist strengthening, completed in 2016, only the upper gates were raised Not raising the lower gates has the potential to cause: Debris Accumulation Flooding of municipalities Damage to: Highway infrastructure Canal infrastructure Public outcry

13 Movable Dam 5: Rotterdam Junction LOCK 9 MOVABLE DAM 5 Constructed 1914 Rehabilitated 1998,2006

14 Movable Dam 5: Rotterdam Junction LOCK 9 MOVABLE DAM 5 Constructed 1914 Rehabilitated 1998,2006

15 Tropical Storm Lee (50 YR Event): Sept 2011

16 Tropical Storm Lee (50 YR Event): Sept 2011

17 Flood Warning Operations System (FWOS) Ability to: Test Canal Corp. operation procedures Uses hindsight and foresight technology

18 Benefits to FWOS Can be used more accurately than current Northeast River Forecast Center (NERFC) predictions within 24 hours of a predicted storm event More precise operation timelines

19 How It s Done An unsteady simulation is run with historical and predicted data A continuously learning model FWOS uses four trigger criteria to determine whether the Movable Dams should be removed or not

20 How It s Done (cont.) Gate lifting times were observed during the 2015 winter shutdown operations Model tested against three large storm events: Hurricane Irene (2011) Tropical Storm Lee (2011) Tropical Storm Andrea (2013)

21 4 Triggers that Decide Whether to Remove MDs NYSCC Staff Safety Criteria Catwalk Upstream Pool Downstream Pool

22 4 Triggers that Decide Whether to Remove MDs Lower Gate Lifting Criteria HW TW Difference

23 4 Triggers that Decide Whether to Remove MDs HW TW Difference

24 4 Triggers that Decide Whether to Remove MDs Upright Lifting Criteria HW TW Difference

25 4 Triggers that Decide Whether to Remove MDs Upright Lifting Criteria HW TW Difference

26 4 Triggers that Decide Whether to Remove MDs Critical Infrastructure Criteria Upstream Pool Downstream Pool

27 4 Triggers that Decide Whether to Remove MDs Upstream Pool

28 Testing & Procedures 48 Hours Before Trigger NERFC Prediction Notice to Mariners 24 Hours Before Trigger FWOS Prediction Mobilization Safety Meeting Movable Dam Removal TRIGGER EXCEEDANCE

29 Conclusion The last 3 large storm events the Mohawk River has experienced have been tested using FWOS During all 3 simulations, flooding and damaged infrastructure could have been reduced if the Movable Dams were removed prior to the event

30 our people and our passion in every project Contact Information: Kenneth Avery, PE, CFM, D. WRE Emily Herbst, EIT