Measuring erosion and sediment yields on slopes and in ...
Transcript of Measuring erosion and sediment yields on slopes and in ...
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Baoyuan LIU, Yaxian HU
Northwest A&F University
Beijing Normal University
Measuring erosion and sediment yields
on slopes and in small catchments
2021-07-09
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About us
Dr. Baoyuan Liu
Leading expert of soil erosion research in China
Founder of the Chinese Soil Loss Equation (CSLE)
Parameterize the gradient factor of steep slopes
Dr. Yaxian Hu
Soil erosion processes and carbon cycling
Settling and transport behavior of eroded sediment
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Useful books
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Content
1. Introduction
2. How to measure water erosion?
3. How to measure wind erosion?
4. How to control soil erosion?
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1. Introduction
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Nyle Brady and Ray Weil
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In earth science, soil erosion is the action of surface
processes (such as water flow or wind) that remove soil,
rock, or dissolved material from one location on the
Earth's crust, and then transport it to another location.
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Soil Erosion
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Water erosion
Liquid water is the most common agent of erosion. Rainwater, rivers, and the ocean
continually erode rock, sand, and soil. The pounding waves of the Atlantic Ocean eroded
the foundations of this home in the Outer Banks, North Carolina.
Photograph by Richard Barnes, National Geographic8
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Wind erosion
Wind is a powerful force of erosion. This thick cloud drifting over the Atlantic Ocean is a
beautiful example of wind erosion—dust from the Sahara Desert being transported by
wind to northern South America.
Image courtesy NASA, by Jeff Schmaltz, MODIS Rapid Response
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Natural Resources Conservation Service
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Adopted from Goswin Heckrath
Tillage erosion
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Glacial erosion
Ice, usually in the form of glaciers or ice sheets, is a large-scale agent of erosion. Here,
eroded rubble (called moraine) collects in front of the path of a glacier.11
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Chemical erosion
Chemical erosion describes the process of rocks changing their chemical composition as they
erode. Chemical erosion contributed to the beautiful Stone Forest in Yunnan, China, for
example. Here, rainwater interacts with the limestone rocks in a process ca
Photograph by Keith Ladzinski, National Geographic12
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Geological vs. Accelerated erosion
Geological/Natural erosion Accelerated erosion
Photograph by Mrs. Emma Love
Photograph by Pete McBride, National Geographic Photograph by Yaxian Hu
13National Geographic
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Soil erosion in
northeastern China
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Soil erosion in Tibetan Plateau
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Therefore,
To effectively control soil erosion, we need to
◼ 1) identify the most susceptible regions, season or more
specific conditions (soil type, coverage, tillage, etc.) .
◼ 2) establish and apply soil conservation measures.
◼ 3) use modeling to predict soil erosion risk in the future.
All this starts with by measuring and recording.
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2. How to measure water erosion?
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2.1 Soil erosion measurements at different scales
1) Micro-plot (splash)◼ Ewald Wollny in 1882, 80 cm 80 cm
2) Typical bounded plot (rectangular)◼ M.F. Miller in 1917, 6 ft72.6 ft = 0.01 acre (40.46m2)
◼ In China: 5 m 20 m = 100m2
3) Field scale◼ Sampson, A. W. Utah, 1912, 10 acre (4 hm2)
◼ Zizhou in China, 1963, 1.72 hm2
4) Small catchment◼ 40000-250000 acres (in the US)
◼ < 50 km2 (in China)
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1) Micro-plot
--- Splash
1) Micro-plot (splash)
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Dish
◼ Round shape
◼ 0.21mm-0.25mm
◼ clean
1) Micro-plot (splash)--- Ellison splash dish
Diameter: 3.5 inch
Height: 2 inch
1) Micro-plot (splash)
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1) Micro-plot (splash)--- Ellison splash board
1) Micro-plot (splash)
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1) Micro-plot (splash)--- Ellison splash board
1) Micro-plot (splash)
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1) Micro-plot (splash)
--- Morgan splash cup
Morgan, R. P. C. 1978. Field studies of rainsplash erosion.
Earth Surf. Processes 3 (3): 295-299.
1) Micro-plot (splash)
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Stallings,1957
1) Micro-plot (splash)
1) Micro-plot (splash)
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2) Bounded plot
--- Unit plot
2) Bounded plot
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Universal Soil Loss Equation (USLE)
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A = R * K * LS * C * P
Where,A = estimated average soil loss in tons per acre per yearR = rainfall-runoff erosivity factorK = soil erodibility factorL = slope length factorS = slope steepness factorC = cover-management factorP = support practice factor
Unit Plot: standard plot, with slope gradient of 9%, length of
about 20 m, fallow with tillage is up and down slope with no
conservation practices.
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2. Bounded (rectangular) plot
--- Unit plot
Applied side: to calculate soil erodibility
Wischmeier and Smith, 1978
2) Bounded plot
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Originally as unit plot, but not ploughed for years
Cannot be treated as unit plot, thus cannot be used to estimate soil erodibility factor
2) Bounded plot
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2) Bounded plots
--- with different slope lengths (not unit plot)
2) Bounded plot
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2) Bounded plots
--- with different slope gradients (not unit plot)
2) Bounded plot
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2) Bounded plots
--- with different tillage practices (not unit plot)
2) Bounded plot
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2) Bounded plots
--- with different coverage (not unit plot)
Bare vs. Grass Crop vs. Native grass Shrub vs. Pine
2) Bounded plot
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2) Bounded plots
--- for specialized research (not unit plot)
Sub-surface runoff
2) Bounded plot
e.g., non-point source pollution
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2) Bounded plot
--- Components of bounded plots
2) Bounded plot
Morgan, Soil Erosion and Conservation
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2) Bounded plot
--- sediment tank
2) Bounded plot
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2) Bounded plot
--- trough
The trough is too low, and soils on the
eroding slope are very likely to collapse
over into the trough and overestimate
the erosional soil loss.
2) Bounded plot
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2) Bounded plot
--- trough
The trough is oversized, and eroded sediments are apt to stay in
the big area of the trough instead of running into the collector.
2) Bounded plot
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2) Bounded plot
--- sediment divisor
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2) Bounded plot
--- sediment divisor
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2) Bounded plot
2) Bounded plot
--- Sediment sampling
Challenges: sediment particles can settle through water and thus accumulate at
the bottom. Even after stirring, it is nearly impossible for conventional manner to
ensure the sediment suspension is well blended.
Column sampler: it can sample a sizeable column of suspension from the
sediment barrel or trap, efficiently overcoming the bias by conventional manner.
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Ultrasonic
water level
meter
Turbidity
Data
Logger
3) Erosion investigation at field scale
--- H-Flume
3) Field scale
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3) Field scale
--- (micro H-flume)
3) Field scale
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3) Field scale--- Sediment sampling with turbidity meter
3) Field scale
• Turbidity meter can automatically record the data.
• But, it cannot detect large sediment concentration beyond its scale.
• Thus, not applicable for regions susceptible to severe soil loss.
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water level
meter
Coshocton
wheel
3) Field scale
--- Sediment sampling with Coshocton wheel
3) Field scale
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3) Field scale
---H-Flume
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⚫ Sampling (rotating) intervals are
programmable as you need.
⚫ Take the samples back, weigh,
and then calculate sediment
concentration.
3) Field scale--- Sediment sampling with ISCO auto sampler at programable intervals
3) Field scale
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3) Field scale--- Sediment sampling with auto sampler by weighing
Protocol: collecting - weigh - record - overturn
Assumption: sediments are heavier than water.
3) Field scale
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4) Small catchment
4) Small catchment
--- Weir
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4) Small catchment
4) Small catchment
--- V-shaped Weir
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4) Small catchment
4) Small catchment
--- Rectangular Weir
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A. Rainfall simulation
B. Isotopic fingerprint (tracers)
C. Remote sensing
2.2 Commonly applied methods to improve erosion measurement
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1. Able to simulate the desired rainfall intensity
2. Drop size similar to natural raindrops
3. Terminal velocity of drops similar to natural raindrops
4. Kinetic energy of drops similar to natural raindrops
5. Drop impact angles similar to natural raindrops
6. Even spatial distribution over the subject area
7. Might need shield to protect falling drops from wind
8. Easy to operate
A. Rainfall simulation
A. Rainfall simulation
--- Basic requirements of rainfall simulation
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Spraying system --- veejet
A. Rainfall simulation
A. Rainfall simulation
--- nozzle
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A. Rainfall simulation
--- working pricinples
Hudson
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A. Rainfall simulation
A. Rainfall simulation
--- the hall
• Tall enough falling height for water drops to achieve terminal velocity
• Spacious enough to limit spatial variation of raindrops
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A. Rainfall simulation
A. Rainfall simulation
--- indoors over small flumes
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A. Rainfall simulation
A. Rainfall simulation
--- indoors over large transformable flume
Flume transformable as
needed:
Gradient, Slope type
Width, Length
etc.
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A. Rainfall simulation
A. Rainfall simulation
--- portable equipment in the field
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A. Rainfall simulation
A. Rainfall simulation
--- raining in the filed
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A. Rainfall simulation
A. Rainfall simulation
--- Control panels
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A. Rainfall simulation
A. Rainfall simulation
--- Runoff and sediment collection
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A. Rainfall simulation
A. Rainfall simulation
--- Soil moisture sampling
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A. Rainfall simulation
--- Electricity and water supply
A. Rainfall simulation
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A. Rainfall simulation
A. Rainfall simulation
--- Packing and transport
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14C
137Cs (half life about 30.17 years)
239+240Pu (half life about 6500 to
24100 years)
Adopted from Scott van Pelt & Asmeret Berhe65
B. Isotopic fingerprint
--- 137Cs
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B. Isotopic fingerprint
--- 137Cs
(Morgan after Walling and Quine 1990)
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B. Isotopic fingerprint
--- soil sampling
B. Isotopic fingerprint
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B. Isotopic fingerprint
B. Isotopic fingerprint
--- Drying and grounding
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B. Isotopic fingerprint
B. Isotopic fingerprint
--- Measurement by gamma-ray spectrometer
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C. Remote sensing
--- Satellite and drone
Borrelli et al.,
2017
Courtesy:
Nikolaus J. Kuhn
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3. How to measure wind erosion?
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http://www.trunity.net/sam2/view/article/51cbf4467896bb431f6af4c8/
http://nptel.ac.in/courses/104103020/module7/lec3/1.html
Note that the photo was taken in early spring before most crops were planted and
before the trees had fully leafed out. (Photo courtesy of USDA Natural Resources
Conservation Service)
Wind erosion
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Unlike water erosion…
Wind erosion has some unique challenges:
Wind direction is always changing and highly
unpredictable
Wind velocities have great vertical variation
from the ground to the above
Difficult to identify the amount of eroded dust
blown in and out of the targeted area
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Sizes of inlets for
the different catchers
are:
1) 10 * 20 mm
2) 20 * 20 mm
3) 30 * 20 mm
4) 50 * 20 mm
5) 50 * 20 mm
Wind erosion measurement--- Big Spring Number Eight sampler
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The dimensions can be
varied according to the
material used to build the
sampler. The sampler used
by the National Soil
Resources Institute had an
inlet pipe of 10 mm
diameter and an outlet pipe
of 15 mm diameter.
Wind erosion measurement--- Wilson and Cooke bottle sampler
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3
4
2
Wind erosion measurement--- Wind Erosion Circle designed by Baoyuan Liu
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77Adopted from Wolfgang Fister
Wind erosion measurement--- wind tunnel
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• Rare-Earth Element (REE): a set of 17 chemical elements
• Ce, Dy, Er, Eu, Gd, Ho, La, Lu, Nd, Pr, Pm, Sm, Sc, Tb, Tm, Yb, Y
https://sciencenotes.org/rare-earth-elements/78
Wind erosion measurement--- Rare-Earth Elements (REE)
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79Adopted from Scott van Pelt
Wind erosion measurement--- Rare-Earth Elements (REE)
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4. How to control soil erosion?
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