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Experiences of restoring physical habitat with an artificial

River Restoration Conference Presentation 2015
by

Jennifer Cox

on 18 May 2015

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Transcript of Experiences of restoring physical habitat with an artificial

CASE STUDY CONTEXT
EXPERIENCES OF RESTORING PHYSICAL HABITAT WITH AN ARTIFICIAL RIFFLE
Jennifer R. Cox and Dr Philip J. Soar
MONITORING
IMPACT POST-FLOODING
EXPERIENCES
Shopham Bridge Habitat Enhancement Scheme
Overview:

Catchment: 350 km²

Pressures: Erodible catchment
High sediment input Channel Modification

Groups: Arun and Rother Rivers Trust
Wild Trout Trust

Funded: Catchment Restoration Fund

Feature: Artificial Riffle
November 2013
January 2015
August 2013
July 2013
BASELINE SURVEY
September 2013
CONSTRUCTION

FLOODING

December 2013-March 2014
August 2014
March 2014
Monitoring of Physical Habitat

Repeat in-channel surveys of velocity & depth using a Sontek RiverSurveyor S5 ADCP
August 2013
August 2014
Velocity

Physical Habitat

Elevation Change

Velocity

Physical Habitat

IMMEDIATE IMPACT
Elevation Change

Weighted Usable Volume for:

Brown Trout
Chub
Dace
Roach

Life Stages:

Adult
Juvenile
Grayling
Perch
Pike
Bream

Fry
Spawning
Fry
Dace
Roach
Weighted Usable Volume:


Mostly Maintained

Some increases following flooding

Comparison of moderate flow data

Another high flow event?
Summary
1. Resilient features



2. Value of rapid high resolution data monitoring



3. Use of baseline data at a range of flows, bankfull discharge recurrence interval of 1-2 years...

Need for advanced planning!
Full transcript