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“The views, opinions and findings contained in this report are
those of the authors(s) and should not be construed as an
official Department of the Army position, policy or decision,
unless so designated by other official documentation.”
Aubrey Harris, PE
Ashlee Rudolph (USBR)
April 24, 2020
RESTORATION SITE
HYDRAULICS:HABITAT SUITABILITY MODELING OF RIO
GRANDE SILVERY MINNOW
1
File Name
OVERVIEW
In 2020, USACE-SPA entered interagency
agreement with USBR.
• Map Habitat Suitability for the Rio Grande
Silvery Minnow at (8) Habitat Restoration
Sites in the San Acacia Reach.
• Develop repeatable methods to quantify
“habitat effectiveness”.
2
Photo credit: Jennifer Bachus, USBR 2016
• Agency roles for this project
• State of the science
• Project Scope
• Results (in progress) and Figures
• Summary
• Next steps
Ground rules:
• Questions may be submitted any time via chat;
• Time for discussion at the end.
OUTLINE
ORGANIZATIONAL ROLES3
File Name
Bureau of Reclamation: Restoration Site Owner and Builder, Contracts Data
Collection for the MRG, Funds monitoring of Sites, Holder of this Service
Agreement.
Ashlee Rudolph (Project Manager)
• Coordinates collaboration. Any formal comments and feedback regarding
this effort will be delivered to her.
NM Interstate Stream Commission: Restoration Site Owner and builder,
Funds Monitoring of Sites
GSA and Save Our Bosque Task Force: Sub-contractors collecting and
analyzing monitoring data.
US Army Corps of Engineers: Hydrology and hydraulic analysis.
MAPPING HABITAT SUITABILITY
• Habitat Suitability Index: Describes physical
parameters that define “suitable habitat”.
• For RGSM, the literature provides hydraulic
parameters: depth and velocity.
4
File Name
Scruton (2002)(telemetric habitat
mapping for
Atlantic salmon)
ASIR (2019)
• Areal Floodplain Inundation has been used as
a proxy for “suitable RGSM habitat”
o “More Water” is better for the minnow.
o Channelization has negatively effected the
minnow.
• However, “More Water” correlates with RGSM
populations only to a point;
• Also, “More Water” is a challenging
management strategy.
COMPLICATING REALITIES
• The Middle Rio Grande transports and
deposits sediment, effecting inundation
patterns on the floodplain and in the
channel.
• There are temporal components to the
system:
o duration, frequency, rate of recession.
5
File Name
Bauer 2009
0
1000
2000
3000
4000
5000
6000
1-Mar 1-Apr 1-May 1-Jun 1-Jul
Dis
charg
e (
cfs
)
Spring Runoff at Albuquerque, Selected Years
2008 2010 2012
OPPORTUNITIES IN HYDRAULIC & ECOLOGICAL
FUNCTION MODELING • Hydraulic Modeling can provide
information “in between” the monitoring
data collection.
• The resolution of 2-D modeling is
appropriate for mapping “fringe habitat”
and local hydraulics.
• When paired with hydrologic
monitoring:
“More Water” changes to:
o more [low-velocity areas]
o at [discharges more likely to
occur ‘naturally’ in the
system].
• Goals:
o Quantify habitat available at each life
stage of RGSM.
o Determine how habitat changed
following 2019 runoff.
o Integrate in future design analysis.
6
File Name
2-D Model 1-D Model
USACE (tbp-2020)
Geomorphic
• Sediment transport or deposition.
• Affects conveyance on the floodplain and in the channel.
Water
• Hydrology
• (volume, frequency)
• Hydraulics
• (depths, velocities)
Middle Rio
Grande
Habitat
Restoration Sites
7
File Name
• Analysis of 2019 hydrograph,
• Average hydrograph from
2000-2019, and
• Overbanking discharges in
the MRG.
• Comparison of topography
from “As-Built” to “Post-
Runoff” in 2019.
PROJECT SCOPE
SCOPE OVERVIEW -- HYDRAULICS8
File Name
Calibrate
1D/2D
Model
Run Various
Discharge
Simulations
Determine
Area of
Suitable
Habitat per
Discharge
USACE (tbp-2020)
• For each of the (8) habitat restoration sites, create an eco-value
curve for As-Built (AB) and 2019 Post-Runoff (PR) Condition
1
10
100
1000
10000
0 1000 2000 3000 4000 5000 6000 7000 8000
Acre
s
Discharge (cfs)
2-D Area per Discharge, 10-mile Reach in Albuquerque
Surface Area (acres) Total
Velocity (Larvae, Total)
Depth (Larvae, Total)
Combined Velocity and Depth Criteria (Larvae, Total)