mark a. gonzalez national riparian service team
DESCRIPTION
Three Novellas: Past, Present and Future Conditions of the San Pedro Riparian National Conservation Area. Mark A. Gonzalez National Riparian Service Team. Outline. Past, Present and Future Conditions of the San Pedro Riparian System - PowerPoint PPT PresentationTRANSCRIPT
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THREE NOVELLAS: PAST, PRESENT AND FUTURE CONDITIONS OF THE
SAN PEDRO RIPARIAN NATIONAL CONSERVATION AREA
Mark A. GonzalezNational Riparian Service Team
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Past, Present and Future Conditionsof the San Pedro Riparian System
Novella 1: Once Upon a Time – Holocene history of the SPRNCA
Novella 2: Flower Power – Everything you needed to know about plants but were afraid to ask
Novella 3: Making a Better Sponge – Processes that store and release water along the San Pedro River
OUTLINE
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Project Area
San Pedro Riparian National Conservation Area
International border to St. David
SPRNCA boundary
INTRODUCTION
(from Hereford 1993)
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NOVELLA I: ONCE UPON A TIME –
HOLOCENE HISTORY OF THE SPRNCA
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HOLOCENE SETTING
Piedmont/Fan
Inner Valley
Basin Fill
Basement Rock
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HOLOCENE SETTING
Inner ValleyPre-entrenchment Landforms
EntrenchmentLandforms
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HOLOCENE SETTING
Weik Ranch Mbr. 6500-4300 yrs BP (Qwk)
Hargis Ranch Mbr. 3500-2000 yrs BP (Qha)
McCool Ranch Mbr. 2000 BP to AD 1880 (Qmc)
Little Ice Age (AD 1450-1850) paleosol
QwkQhaQmc-B
Qmc-AQmc-A
Qmc-B
Teviston alluvium (Qtv)
7500 yrs BP4000 yrs BP
2600 yrs BP
1900 yrs BP
Historic
Sources: Haynes 1987; Hereford 1993; Waters and Haynes 2001
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HOLOCENE SETTING: MCCOOL RANCH PALEOSOL
1 mi SSummers
WellsGarden Wash
¼ mi N of Casa de
San PedroBoquillas
Wash
¼ mi S of
Boquillas Wash
Qtv
Qmc
Qtv
Qmc
Qtv
Qmc
Qtv
Qmc
Qtv
Qmc
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Physical ConditionsLittle Ice Age (AD 1450-1880)Low-energy environmentShallow depth to water tableHigh organic-matter content (esp. from paleo-cienega)
Water storage and release patterns
HOLOCENE SETTING: MCCOOL RANCH PALEOSOL
Qtv
Qmc
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Biological ConditionsWidespread cienega formationHerbaceous dominated communities
PRE-ENTRENCHMENT CONDITIONS
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Timing (1880s-1910s +/-, Hereford 1993)Downstream initiation (1882, Contention area)Upstream migration (1908 – Hereford Bridge)Spread into and up tributary drainages
PERIOD OF ENTRENCHMENT
Post-entrenchment channel: Deep
San Pedro River
Pre-entrenchment channel: Shallow
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t1 Stable channelt2 Downcutting
t3 Wideningt4 Aggradation
CHANNEL EVOLUTIONARY SEQUENCE
t2
t3
t1 stable t3 widening
t4 aggradationt2 downcutting
t1
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SUMMARY
QwkQhaQmc-B
Qmc-AQmc-A
Qmc-B
Sources: Haynes 1987; Hereford 1993; Waters and Haynes 2001
Stream valleys evolved naturally throughout the Holocene Period in response to climatic fluctuations.
Aggradation (valley filling) coincident with wet/cool periods and high water tables
Channel incision and sediment removal coincident with dry/warm periods
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t1 Stable channelt2 Downcutting
t3 Wideningt4 Aggradation
SUMMARY
t2
t3
t1 stable t3 widening
t4 aggradationt2 downcutting
t1
Channel Evolutionary Sequence: SPR in ‘infancy’
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NOVELLA II:FLOWER POWER --
EVERYTHING YOU EVER WANTED TO KNOW ABOUT
PLANTS BUT WERE AFRAID TO ASK
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PAST –PLANT COMMUNITIES
Terrace Floodplain/CienegaChannel +
Perennial Flow• Obligate wetland
plants: Hardstem and threesquare bulrush; flatsedge; cattail,
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PAST –PLANT COMMUNITIES
Terrace Floodplain/CienegaChannel
Perennial (water-table < 20 ft depth)• FACW plants:
Sacaton; bunchgrass/shrub; mesquite (+/- dependent on fire regime)
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PRESENT – PLANT COMMUNITIES
Holocene Terraces
TerraceFloodplain
Channel
Perennial Reaches
Obligate, and facultative wetland species: hardstem and threesquare bulrush; cattail; spikerush; horsetail, and seepwillow
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PRESENT – PLANT COMMUNITIES
Holocene Terraces
TerraceFloodplain
Channel
Intermittent Reaches
Johnsongrass, Bermudagrass, seepwillow, and minor occurrences of hydric herbaceous species
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PRESENT – PLANT COMMUNITIES
Holocene Terraces
TerraceFloodplain
Channel
Perennial ReachesFremont cottonwood / Goodding’s willow; Baccharis,
with lesser amounts of netleaf hackberry, mulberry, grama grasses
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PRESENT – PLANT COMMUNITIES
Holocene Terraces
TerraceFloodplain
Channel
Intermittent ReachesFremont cottonwood / Goodding’s willow; xeric woody shrub (AZ ash and walnut, hackberry) with tamarisk/; baccharis and herbaceous understory
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PRESENT – PLANT COMMUNITIES
Holocene Terraces
TerraceFloodplain
Channel
Perennial ReachesSacaton – Mesquite continuum
Sacaton dominated with frequent fire
Mesquite dominated with fire suppression
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PRESENT – PLANT COMMUNITIES
Holocene Terraces
TerraceFloodplain
Channel
Intermittent ReachesIncrease in woody shrubs and decrease in herbaceous plants
Facultative plants more common than hydric plants
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Plants in and near the riparian zone ‘stratify’ themselves by:Depth to waterPermanence / seasonality of water (i.e., Perennial
vs. Intermittent flow)
SUMMARY
Holocene Terraces
Terrace
Floodplain
Channel
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NOVELLA III:MAKING A BETTER
SPONGE – STORING AND RELEASING WATER
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WATER STORAGE: BANKS
(I)(IV)
(III)(II)
(I)
I Standard FormII Ponded FormIII Tributary Fan FormIV Adjustment Form
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WATER STORAGE: BANKS
When stage (water level) is high in the channel, water is forced (pushed by hydrostatic pressure) into the banks and stored in the floodplain alluvium.
When stage falls in the channel, the hydraulic gradient is reversed and water flows out of the banks and into the channel to supply baseflow between high-flow events
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WATER STORAGE: BANKS
Ponded water moves out of channel and into banks during high stage.
Stored water also moves down valley with the hydraulic gradient.
(I)(IV)
(III)(II)
(I)
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Floodplain recharge has greater surface area than channel-bank recharge alone. This permits more water to enter alluvial aquifer in short time.
WATER STORAGE: FLOODPLAIN
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WATER STORAGE: FLOODPLAIN ROUGHNESS
To increase floodplain infiltration, Floodplain vegetation must decrease water velocity
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Grazing closure in 1988 (< 25 years ago) has allowed riparian vegetation to establish and grow.
VEGETATION RESPONSE
View from Hereford Bridge: (left) circa mid-1980s (BLM); (right) 10 years later (photos by D. Krueper, BLM)
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WATER STORAGE: TRAPPED SEDIMENT
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WATER STORAGE:
TRAPPED SEDIMENT
AND ORGANIC
MATTER
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1 2 3 4 5
Pou
nds
H2O
in 1
00 P
ound
s of
Soi
l
40
80
120
160
200 195 lbs H2O
140 lbs H2O
100 lbs H2O
55 lbsH2O
33 lbsH2O
Percent Organic Matter
Water Holding Capacity
of Soil
OrganicMatter
(modified from Carpenter)
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LOSS OF WATER STORAGE
kmMiles
0 0.5
0.5
1.51
1
4200 ft
4100 ft
Inner ValleyPre-entrenchment alluvium
West East
V.E. = 100X
Available water volume in SPRNCA pre-entrenchment alluvial aquifer (WVa) composed of silt loam:WVa = (448 acres/mile X 40 miles) X 20 ft thickness X 1.7”/ft ÷ (12”/ft)WVa = 50,000 acre-feet
Pre-entrenchment alluvial aquifer (with 3’ thick cienega soil on 3600 acres (1/5 of riparian area) and MODEST 5% organic matter):
WVa = 50,000 acre-ft + (16,000 gallons X 5 X 3’ X 3600 acres) ÷ (325,851 gals./acre-ft)
WVa = 50,000 acre-ft + 2650 acre-ft = 52,650 acre-ft
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LOSS IN WATER STORAGE
kmMiles
0 0.5
0.5
1.51
1
4200 ft
4100 ft
Inner ValleyWest East
V.E. = 100X
Available water volume in SPRNCA for post-entrenchment alluvial aquifer (WVa) composed of sand:
WVa = (128 acres/mile X 40 miles) X 10 ft thickness X 0.9”/ft ÷ (12”/ft)
WVa = 3840 acre-feet
Post-entrenchment alluvium
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CONTROLS ON PERENNIAL
FLOW
Hwy 92
Hwy 90
Hwy 82
4 Cottonwood
1 Palominas
2 Hereford-Kolbe
3 Hunter
5 Lewis Spr.
6 Escapule
8 Boquillas
7 Charleston
9 Fairbank10 Depot11 Tombstone
12 Smrs-Cnt’n
13 St David
14 Escalante
Babocomari R.
St David
Reaches 9-10 Predominantly Intermittent
Reaches 1-8 Predominantly Perennial
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1
2
34
5
67
89101112
1314 Reaches 1-4 Perennial:
Underlain by restrictive silt-clay layers
Reaches 5-8 Perennial: Gaining reaches with water
upwelling on the east side of the silt-clay restrictive layer
Reaches 9-14 Intermittent: Bedrock controlled or smaller
basin contributionsUSA AZMEX SN
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WestEast7500
2000
4000
6000
Ele
vatio
n, ft
abo
ve s
ea le
vel
3 miles
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South
4000
3000
Pal
omin
as
Her
efor
d
Cot
tonw
ood
Lew
is S
prin
g
Cha
rlest
on g
age
Boq
uilla
s
Fairb
ank
3 Miles
North
Ele
vatio
n (ft
am
sl)
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SUMMARY: CHANGE IN WATER STORAGE
kmMiles
0 0.5
0.5
1.51
1
4200 ft
4100 ft
Inner ValleyWest East
V.E. = 100X
Pre-entrenchment estimated available water storage: 50,000 acre-ft
Post-entrenchment estimated available water storage: 4000 acre-ft
Post-entrenchment alluvium
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Bigger sponges store more water--Sponges get bigger as: Vegetation covers riparian area Vegetation slows stream velocity and
enhances infiltration Vegetation / organic matter is trapped in
sediment
Bottom Line: More vegetation = more water storage
SUMMARY
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Bigger sponges store more water--Sponges get bigger as: Sediment accumulates and aggrades on
floodplain Floodplain widens Floodplains are inundated Tributary mouth fans (and beaver) pond water
Bottom line: More deposition = more water storage
SUMMARY
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Continued improvement in riparian conditions is dependent upon seasonal timing of streamflow, adequate runoff volume and sediment load, and unrestrained floods. Factors that reduce runoff volume, increase salinity, change runoff seasonality, or reduce sediment loads are detrimental to the riparian community (Hereford, 1993).
Protection of both the flow and the sediment regime of this river are crucial to its survival.
SUMMARY