Wednesday, April 24, 2019

Ventura River post-fire sedimentation 2019


Recent delta deposits in Matilija Reservoir, February 24, 2019




The Ventura River watershed is responding to the December 2017 Thomas Fire which burned the majority of the steep mountains in the headwaters.  In 2019, winter storms produced three significant flow events in the Ventura River.  These flows eroded additional sediment from the recently burned mountains and into the creeks and rivers.  Highway 33 above Ojai was closed following each event due to sediment overwhelming culverts and blocking the highway.  These photos of recent sedimentation in the Ventura River watershed were submitted with comments on a recent draft Matilija Dam Removal Sediment Transport Analyses report that is part of the ongoing Matilija Dam Technical Studies.




Matilija Reservoir, recent delta deposits March 11, 2019







Matilija Reservoir, recent delta deposits March 11, 2019
(note bubbles from submerged vegetation)





Matilija Reservoir delta, March 11, 2019
vegetation effects on sediment accretion and erosion
Matilija Reservoir delta, March 11, 2019
vegetation effects on sediment accretion and erosion
Matilija Canyon, Feb 19, 2019
Matilija Canyon, Feb 19, 2019





Sedimentation in North Fork Matilija Creek,
Wheeler Gorge Campground. Jan 29, 2019
Sedimentation at Ventura River Preserve, Nov 24, 2018
 Before: “swimming hole”  15+ ft deep
Sedimentation at Ventura River Preserve,  Feb 19, 2019
After: “swimming hole” previously 15+ ft deep

Sedimentation at Robles Diversion Dam, Feb 24, 2019
The facility was cleaned out at least twice to renew diversion capacity
from the Ventura River into Lake Casitas 


Ventura Rivermouth, January 22, 2019

Tuesday, February 5, 2019

Winter swells and high tides

California saw two large swell events in January 2019, both coinciding with high tide events.





Swells generated in the north Pacific Ocean during winter months seasonally create large waves and surf in Southern California.  The CDIP model (Coastal Data Information Program) illustrates how west swells travel through the Santa Barbara channel with the energy focused on Ventura.

The January 9 swell had 14 ft waves at 15 seconds from a 280 degree westerly direction.  High tide was 5.1 ft at 10:26 am.

The January 18 swell had more energy with 16 ft at 17 seconds from 285 degrees, and 6.1 ft high tide at 6:36 am.

Although the swell dropped during the 6.8 ft "King Tide" on January 20, similar overtopping was observed along the promenade in Ventura.


The following is a collection of photos from these high surf, high tide events.

Ventura's Pierpont community suffered minor flooding with both these events, with wave runup into the streets in areas without dune protection.

Pierpont beach 1-09-2019 (photo: CSUCI)


Pierpont beach 1-09-2019 Pierpont beach 1-09-2019 (photo: CSUCI)

Pierpont beach 1-18-2019 (photo: Shawn Kelly)


The Ventura promenade was overtopped along its length.

Ventura Promenade Aerial 1-18-2019  (photo KGaston)
Ventura Promenade 1-18-2019

Ventura Promenade 1-18-2019
Ventura Promenade aerial view  1-18-2019  (photo KGaston)

Ventura Promenade emergency revetment 1-18-2019
Surfers Point bike path 1-20-2019
6.8' King Tide on this day had similar effect as the larger swell two days before


Surfers Point bike path 1-09-2019
Surfers Point bike path damage after swell 1-09-2019
Surfers Point bike path 1-18-2019  (photo KGaston)
Surfers Point bike path 1-18-2019

Surfers Point aerial -Fairgrounds parking lot 1-19-2019  (photo KGaston)



Surfers Point  1-19-2019 (photo KGaston)

 The Managed Retreat project functioned as designed, with eroded sand exposing the buried cobble berm, and minor overtopping into the foredune area.


Surfers Point Managed Retreat 1-1-09-2019
Surfers Point Managed Retreat 1-1-09-2019
Surfers Point Managed Retreat 1-09-2019

Although the swell and tide were higher on the 18th, driftwood and debris from the Ventura river  reduced wave runup in the managed retreat zone.
Surfers Point Managed Retreat 1-18-2019


Surfers Point Managed Retreat 1-18-2019



   

Thursday, January 31, 2019

Surfers' Point project moves forward


On January 22, 2019, the Ventura County Fair Board unanimously voted in support of the conceptual plan for Phase 2 of the Managed Shoreline Retreat Project.  Many thanks to the board members and all those who took time out of their morning to learn more about the project and show their support!




Concept Plan for Phase 2 of the Surfers' Point Managed Shoreline Retreat Project, Feb 2019



Last year the Fair board voted in support of a successful grant request to the California Ocean Protection Council which will provide the funding to complete final engineering and design in 2019.   Assuming grant funding is secured, this opens the potential for project construction by 2021.




In the meantime, this year's high tides and winter swells continue to damage the bike path, making  progress more critical than ever.



More info:  





Wednesday, January 30, 2019

LightHawk KingTide flight


On January 21-22, Surfrider Foundation partnered with LightHawk to fly over coastal areas around the country and document the King Tide.  Twice a year, King tides occur when the gravitational pull of the moon and the sun are in alignment, causing higher than normal ocean tides. King Tides provide an opportunity to see what normal high tides are going to look like in the near future due to sea level rise.

On the morning of January 21, I joined Ventura City Councilmember Christy Weir, and Alex McIntyre, Ventura City manager for a flight along the Ventura County coast.  Volunteer Pilot Thomas AmRhein expertly handled his Cesna as we covered 30 miles of coast from Port Hueneme to Carpinteria.  The tide was 7.0 ft above mean sea level at 8:40am.  "Normal" high tides are around 5ft to 6 ft for most of the year.

These are some of the photos, arranged from north to south:

Pitas Point overview, LightHawkVentura_1-19-2019

Pitas Point, LightHawkVentura_1-19-2019


Solimar Beach, LightHawkVentura_1-19-2019

Ventura Rivermouth and Surfers' Point, LightHawkVentura_1-19-2019


Pierpoint, Ventura, LightHawkVentura_1-19-2019
Santa Clara rivermouth and Ventura Wastewater Treatment Plant, LightHawkVentura_1-19-2019
Ventura Harbor, Ventura Wastewater Treatment Plant, LightHawkVentura_1-19-2019


McGrath Lake, LightHawkVentura_1-19-2019
Mandalay Power Plant, LightHawkVentura_1-19-2019

Oxnard Shores, LightHawkVentura_1-19-2019

Port of Hueneme, LightHawkVentura_1-19-2019



Many thanks to the good folks at LightHawk for making this flight possible!

LightHawk is the largest environmental flying organization in the country. Founded in 1979, LightHawk engages a network of almost 300 volunteer pilots to provide more than 400 flights each year. Partnering with more than 100 conservation organizations, LightHawk works to help solve pressing river, ocean, land and wildlife problems. Flights enable decision-makers, funders, scientists, media and community members to understand landscapes in a uniquely experiential way, inspiring them to make a difference.

https://www.lighthawk.org


More from Surfrider National:

https://www.surfrider.org/coastal-blog/entry/king-tides-our-future-sea


Thursday, November 1, 2018

Surfers' Point Phase 2 concepts


Planning is moving ahead for Phase 2 of the Managed Shoreline Retreat project at Surfers' Point. The Surfers' Point Managed Shoreline Retreat project is one of the first managed retreat projects to be implemented in California. Developed in response to coastal erosion, it serves as a model of sustainable shoreline management for other similar projects up and down the California coast.

Funding limitations in 2009 necessitated a phased approach to construction, with the first phase completed in July 2011.  Phase 1 included relocation of the bike path and parking lot landward and construction of a man-made cobble berm to stabilize the shoreline.  In 2012 sand dunes were constructed on top of the berm using sand imported from nearby Pierpont beach, and seeded with native dune plants. Dune restoration and maintenance has been supported through ongoing volunteer work days.

High tides of August 2018 damaged the bike path
leaving it vulnerable to coming winter swells.
Phase 2 will address this problem.
Although Phase 1 has demonstrated the effectiveness of the managed retreat approach, only approximately half of the threatened shoreline infrastructure has been relocated. Additionally, several features of the project remain outstanding or require modification as a result of lessons learned.

With the recent award of grant funding, planning is now underway.  The objectives are to:
  • Design refinements for Phase 1 of the Managed Shoreline Retreat project
  • Prepare final site design layout for Phase 2
  • Prepare design alternatives incorporating all integrated features, including civil and coastal engineering, cobble berm, and beach and dune habitat and landscape improvements
  • Complete final plans and specifications to allow for the preparation of bid and contract documents
This work will result in a "shovel ready" project that will be eligible for grant funding to complete construction and implementation.  This project is a perfect candidate for the recent Proposition 68, Parks, Environment, and Water Bond passed by California voters in June 2018. 

The Surfers' Point Working Group met on October 9, 2018.  The consultant team presented initial concept drawings and renditions of the project.  The main concerns with Phase 1 are the parking and stormwater runoff system, as well as fencing and gates, lighting and landscaping.  Some initial options were presented for all of these items.

Design options are also being considered to relocate the remaining bike path and parking lot further inland on Fairgrounds property, out of harms way.  The initial concept presented for this "Phase 2" area involves widening Shoreline Drive to provide space for the relocated parking lot and bike path.  A similar beach restoration strategy as used in Phase 1, a cobble berm and sandy beach/dune area, would be constructed to provide long term protection for the new bike path.

The rendition below provides an aerial perspective of how this might look:

Surfers Point Phase 2 - aerial rendition of initial "Concept A"


In this proposal the City would dedicate Shoreline Drive to the Fairgrounds to provide for relocated parking.    The layout of the parking areas and potential improvements are shown below.


Surfers' Point Managed Shoreline Retreat - Initial conceptual layout "Concept A" for Phase 2, October 2018


Utilizing Shoreline Drive in this manner provides the potential for an increase in parking from what exists today.  Note that these are very preliminary concepts and will change based on input from the working group.

The long-term benefits of this approach include:
  • Incorporating City-owned Shoreline Drive into the Fairgrounds property
  • Relocating the threatened bike path and parking lot
  • Eliminating hazard and liability of the undermined bike path and associated debris 
  • Increased public access, safety, and day-use beach parking
  • Protecting Fairgrounds property from future erosion damage and flood risk
  • Aesthetic improvements to Ventura's most popular beach and recreation area

More on this blog: