9th ISRS PPT

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Study Tour to the Three Gorges Project
SEDIMENT MANAGEMENT IN IRRIGATION
DISTRICTS ALONG THE LOWER YELLOW RIVER
Hongling SHI International Research and Training
Center on Erosion and Sedimentation (IRTCES)
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1. INTRODUCTION2. PROBLEMS OF SILTATION 3. THE
STRATEGY OF SEDIMENT MANAGEMENT4. CONCLUSIONS
contents
IRRIGATION AREA ALONG THE LOWER YELLOW RIVER
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What

• Phenomena

-- to put forward the question
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The irrigation and diversion from the lower
yellow river is lifeblood for this areas economy
development.
Until 1990, about 4 billion(t) of sediment were
diverted in the irrigation area.
Water diversion from the Lower Yellow River
carrying famous high concentration of sediment,
inevitably diverted much more sediment.
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Siltation has been a restricted factor in water
resources distribution and environment protection
in wide area along the river
The purpose of our research is promoting the
beneficial water resources and abolishing the
harmful redundant sediment.
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Why

• Cause

-- to make clear the reasons
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How

• Measures

-- to deal with the problems
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Sediment Management is not a Unitary but an
Integrated Measure
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• Sediment Utilization

The flood season is a good opportunity Soil
Improvement by Warping
Location of sampling Soil type Depth (m) D (mm) Salinity () Organism () Nitrogen () Phosphorus () Kalium ()
Heying, Xinxiang city Sand 0-0.3 0.0664 0.110 0.1704 0.015 0.0865 0.8506
Heying, Xinxiang city Twofold 0-0.3 0.0327 0.124 0.1999 0.031 0.1881
Heying, Xinxiang city Silt 0-0.3 0.0198 0.142 0.5800 0.074 1.1962 1.1962
Heigangkou, Kaifeng city Sand 0-0.3 0.0604 0.057 0.1752 0.017 0.1957 2.2283
Heigangkou, Kaifeng city Twofold 0-0.3 0.0434 0.76 0.2195 0.032 0.1881 1.2155
Heigangkou, Kaifeng city Silt 0-0.3 0.0191 0.127 0.6832 0.067 0.2476 1.5403
Wangwangzhuang Sand 0-0.3 0.0300 0.080 0.2146 0.029 0.1692 1.6838
Wangwangzhuang Twofold 0-0.3 0.0238 0.093 0.3285 0.047 0.1559
Wangwangzhuang Silt 0-0.3 0.0142 0.108 0.4564 0.093 0.1828 1.8318

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• Sediment Utilization

Embankment Strengthening by Deposition Inside and
Outside of the Embankments
the Yellow River is a famous aggrading river
Formed Gullies along the embankments. Threat the
safety of the embankments
Ascended the level of underground water. Give
birth to the swamps and make the soil salinized
Raise the ground surface, and strengthen the foot
of the embankments by desilting outside
Widen and consolidate the embankments by
desilting inside
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• Sediment Treatment Techniques

Storing Water by Ponds, and Depositing Sediment
Dispersedly
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• Sediment Treatment Techniques

Constructing Reservoirs for Sediment Settling and
Water Storing
inlet
Settling strap
Water storing
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Sediment Transportation Measure
Proper operation modes concentrating large
discharge in short time of water diversion
combining diversion with storage diverting water
avoiding peak sediment concentration avoiding
backwater in canals carefully maintaining canals
etc.
Engineering measures increasing longitudinal
slope of irrigation canals lining canals
adopting deep-narrow cross sections reducing
head losses of crossing structures drawing water
from surface layer by use of rubber dam etc.
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Sediment Transportation Measure
Installing Pump Station along the Truck Canal
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Diverting water from the Lower Yellow River plays
an important role in this area. The new
situation of the water resource of the Yellow
River decreased and the sediment deposition
redundant, the proper management to resolve for
the wide irrigation area development should be
found. The long distance transport of sediment
is the proper way. It should be a complexion of
sediment utilization, sediment treatment and
sediment transportation. Summarizing and
upgrading such experience is much significant for
the sustainable development of water diversion
from the Yellow River.
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Thanks for your attention
Study Tour to the Three Gorges Project