San Dieguito Lagoon Inlet Dynamics and Maintenance

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Presentation transcript:

San Dieguito Lagoon Inlet Dynamics and Maintenance Coastal Environments La Jolla, CA www.coastalenvironments.com 3 June 2004 CE Ref. No. 04-07

Lagoon Inlet Lagoon Inlet Dynamics Lagoon monitoring program 1993 Flood Inlet sedimentation Inlet behavior Inlet Maintenance Plan Initial and Periodic Maintenance Excavation, public access and safety Effect of artificial inlet opening on adjacent beaches Video – Excavation Operation (Sep 2000)

Surveys and Measurements

1993 San Dieguito River Discharge

Established Transects

Transects of Interest

Traverse TR2 Located at the Inlet Area

Traverse TR7 Located at West Channel

Traverse TR10 Located East Railway Bridge

Traverse TR11 Located East Railway Bridge

Cross-Sections Changes Jan Jan Sep 1993 1994

Areas 1, 2 and 3

Sedimentation Rates Areas 1, 2 and 3 6000

Weak Outflow – Inlet 1992

Flood of 1993 causing Strong Flow – Inlet 1993

Stable Inlet – 1994

Excavation Plan Initial excavation Periodic dredging At start of project Estimated by 45,000 yd3 Periodic dredging Every 8 months 16,000 yd3

Initial Excavation

Periodic Excavation

Estimated Excavated Volumes

Opening San Dieguito Lagoon Number Open Date Close Date 1 23 Sep 2000 21 Nov 2001 2 4 Oct 2002 4 Nov 2002 3 5 Sep 2003 Still open

Beach Response to SEP 2003 Artificial Inlet Opening Profile Located Just South of Inlet Control Profile Located 2,000 ft South of Inlet

Excavation Operation – Sep 2000 Video of the Inlet Opening can be viewed on the previous Web page from within the June 2004 Presentations section