The present invention relates to inverted vertical E plate bank protection
system for river flow training structure to stabilizing river courses, river bank
protection and control the erosive action of river flow.
Background of Invention:
In state of the art, several references have been found disclosing many
applications of submerged vanes in river hydraulics such as bank protection
for channel bends, protection of bridge abutment and piers, prevention of
sediment drift in hydropower or irrigation channel junction. These vanes give
satisfactory results to produce the optimal depth of river bed to eliminate the
deposition of sediments or scouring and improve the overall navigability of
river to make suitable habitat for aquatic fauna.
Submerged Vanes are low height, thin rectangular shape flow training
structures. They are installed on in an outer channel bed with a suitable angle
of attack to the incoming flow. These Iowa vanes have been used by a
number of researchers for the bank protection. Vanes are specially designed
to induce a helicoidal vortex. When the flow takes place through vane, a high
pressure and low-pressure forms at upstream and downstream. This pressure
difference induce vortex which is responsible to modify the near bed flow
pattern as a consequence velocity, shear stress changes and sediment
redistribution takes place within the channel. This vortex weakens the
centrifugally induced current leads to outer bank scour. These vanes are also
known as sacrificial vanes as they become damaged due to impact of flow on
the vanes. As such in the current system, this vertical plate/vane does not
work for a longer time against erosive action of flow. This vertical plate is
damaged due to impact of erosion. Accordingly, there remains a need for an
improved scour protection device that overcomes the limitations of the prior
art.
KR101662063 teaches the scour protection with a radial structure easily by
constructing the scour protection by joining a grid-type PC cover plate having
a frame structure to an upper side of a PC block after filling 100 mm or
greater of crushed rock inside and outside of a well after installing the PC
block in the shape of the well in a plurality of fixating anchors inserted in a
concrete material of a bridge base. The scour protection comprises: a plurality
of the fixating anchors which are inserted at intervals, when the concrete
material for the bridge base is deposited, have portions exposed upwards,
and form a circle in the shape of a well; the PC block which comprises a block
structure, which has anchor fixating grooves formed on a lower side to
correspond to the fixating anchors and is manufactured in the shape of an arc
by a PC construction method, a dowel bar, which is formed to protrude from
an upper side of the block structure, protrusion units, which are formed on
both sides of the block structure to correspond to each other, and a plurality
of binding brackets, which are formed at intervals in a vertical direction on
both sides of the block structure, consist of the insides and the outsides, and
are joined by a joining means, is formed in the shape of an arc, and forms the
well when a plurality of the PC blocks are joined; the crushed rock which is
filled inside and outside the well formed in a circular shape by joining the PC
blocks; and the grid-type PC cover plate which has a dowel bar fixating
groove formed on a lower side to correspond to the dowel bar of the PC
block, is formed in the shape covering an upper portion of the crushed rock
on the outside from an upper portion of the PC block, and forms the shape of
a doughnut when a plurality of the grid-type PC cover plates are joined.
CN102363961 teaches deepwater single-wall steel plate pile cofferdam
structure with low buried depth. The structure comprises a plurality of bored
piles, a steel plate pile cofferdam around the bored piles, bagged sand
positioned outside the cofferdam and arranged on the surface of a river bed,
and high-pressure rotary jet piles constructed in the cofferdam and outside
the bored piles, wherein the plane size of the cofferdam is greater than that of
a bearing platform to be constructed so as to reserve a construction space.
By using the steel plate pile cofferdam, the deepwater low pile bearing
platform and the underwater part of a pier of a bridge can be constructed with
relatively low cost and minimum construction risk, and a double-wall steel
cofferdam scheme with relatively high cost does not need to be adopted for
construction, so that the turnover steel consumption of the cofferdam serving
as a temporary project is saved, and the application range of the deepwater
steel plate pile cofferdam construction technology is enlarged.
KR20090098554 teaches scour prevention bar of bridge foundation structure,
A bottom plate for accommodating the lower outer periphery of the bridge
foundation structure in the direction of the flow of the river is installed on the
river surface, and then a pair of flow guide plates and a blocking plate
connecting the flow guide plate are installed on both sides of the bottom
plate. Fixing a pair of sealing plates made of one modification on the upper
surface of the flow guide plate to accommodate the outer periphery of the
bridge foundation structure, the inner space of which one side is opened by
the combination of the flow guide plate, the blocking plate and the sealing
plate By providing a stream flow into the inner space to maintain the flow rate
is stopped, scour prevention bar of the bridge foundation structure,
characterized in that configured to prevent friction from indirect and direct flow
on the outer periphery of the bridge foundation structure .
IN199932 teaches composite scour protection device for guarding a bridge
pier against scour comprising of odd numbers of circular collar plates of
diameter one to three times the size of the pier having an inter-plate spacing
of one-tenth to one-half of size of pier, around a circular pier, top plate is
located at average bed level and at least one plate is located at half the
diameter of the pier below the bed level for reducing scour by more than 80%
EP1809815 Scour protection apparatus comprising one or more containment
means, said containment means placed in a location to prevent scour, each
of said containment means substantially filled with matter to form blocks,
characterised in that at least a portion of the outer surface of said
containment means is adapted to have an appearance sympathetic with at
least one feature of the location.
US4711597A A flow-training structure for use in rivers and streams to
minimize bank erosion, and to control bed degradation and aggradation. The
structure consists of single vanes or arrays of vanes of a particular doublecurved design. The vanes are installed in the river bed in designed arrays to
produce changes in the local directions of the near-bed velocity, without
changing the sediment-transport or flow-conveyance capacities of the
channel.
US9453319B2 Several practical refinements, extensions, additions, and
improvements to the manufactured three-dimensional continuous convexconcave fairing with attached vortex generators are provided. The piecewise
continuously varying slope and curvature fairings provide manufacturing cost
reductions, as well as cost reductions by reducing the frequency and
complexity of monitoring practices for bridges and elimination of temporary
fixes that require costly annual or periodic engineering studies and
construction to mitigate scour on at-risk bridges. The probability of bridge
failure and its associated liability to the public is totally avoided since the root
cause of local scour is prevented.
Summary of Invention:
Lot of devices were developed for river piers protections. Bank protections
which were eroded by flow of rivers specially in rainy seasons became a task
for researchers. Lot of blocks type protections are provided which was
problematic where shape of river is curved shape. Running water when
changed direction loosen the blocks and erode with water.
To improvise safety of river bank protection, an Inverted E shaped submerged
vanes assembly was used in place of submerged vanes. Inverted E shaped
device comprises of three horizontal plates which are to be attached at the
top edge of vertical plate, at the centre of vertical plate(at bed level) and at
bottom of the vertical plate. These three horizontal plates protect vertical plate
from the direct impact of erosive action of water.
In this assembly of E shaped plates, three horizontal plates were attached to
the vertical plate. In which one plate was at the top edge of vertical plate,
another plate at the center of vertical plate (bed level) and third plate at
bottom of the vertical plate. These three horizontal plates protect vertical plate
completely and reduces erosion around the vertical plate. Effect of vortices
and downflow would be diminished by the upper plate mounted on vertical
plate which reduces effect scouring around vertical plate. Vortices causes
maximum erosion at bed level around vane but strength of vortices will be
weakened by the horizontal plate situated at the bed level. And the third
horizontal plate which is placed below average bed level and this horizontal
plate works during lowering of bed level. These two horizontal plates above
and at bed protect vertical plate and stabilise the vertical plate against the
erosive action of flow. Once vertical plate or vane is protected from scour,
then this vertical plate will work in the river for a longer duration, stabilizes
river banks or constraining the migration of meanders.
Brief Description of drawings:
The above-mentioned features and other advantages of this present
disclosure, and the manner of attaining them, will become more apparent and
the present disclosure will be better understood by reference to the following
description of embodiments of the present disclosure taken in conjunction
with the accompanying drawing, wherein:
Figure 1 illustrates a block diagram of a submerged inverted E plate,
according to an embodiment herein;
Figure 2 illustrates a block diagram of plan of submerged inverted E plate
arrangement is installed inside the river, according to an embodiment herein.
Figure 3 illustrates a block diagram of vortex formation on the inverted E Plate
Figure 4 illustrates a block diagram of submerged inverted E plate with vortex
formation on the plate is installed inside the river, according to an
embodiment herein.
Figure 5 illustrates a block diagram of submerged inverted E plate with vortex
formation on the plate is installed during lowering of bed level inside the river,
according to an embodiment herein.
Detailed Description:
Reference will now be made in detail to the exemplary embodiment of the
present disclosure. Before describing the detailed embodiments that are in
accordance with the present disclosure, it should be observed that the
embodiment resides primarily in combinations arrangement of the system
according to an embodiment herein.
Any embodiment described herein is not necessarily to be construed as
preferred or advantageous over another embodiment. All of the embodiment
described in this detailed description are illustrative, and provided to enable
persons skilled in the art to make or use the disclosure and not to limit the
scope of the disclosure, which is defined by the claims.
It will be apparent to those skilled in the art that various modifications and
variations can be made to the present embodiment without departing from the
spirit and scope of the invention. Thus, it is intended that the present
embodiment and disclosure cover the modifications and variations of this
invention provided they come within the scope of the appended claims and
their equivalents.
In the following description, for the purpose of explanation, numerous specific
details are set forth in order to provide a thorough understanding of the
arrangement of the system according to an embodiment herein. It will be
apparent, however, to one skilled in the art, that the present embodiment can
be practiced without these specific details. In other instances, structures are
shown in block diagram form only in order to avoid obscuring the present
invention.
As mentioned, there remains a for an improved scour protection system, the
embodiment herein addresses the need by providing an inverted E shape
submerged plates on the outer bend of the river bank which prevents the flow
to meander and also enabled scour reduction around submerged vane. This
inverted E shape submerged plates of the embodiment herein includes three
horizontal plates fixed on the vertical plates. In which, one plate was at the
top edge of vertical plate, another plate at the center of vertical plate and third
plate at bottom of the vertical plate. These three horizontal plates protect
vertical plate completely and reduces erosion around the vertical plate. Effect
of vortices and downflow would be diminished by the upper plate mounted on
vertical plate which reduces effect scouring around vertical plate. Vortices
causes maximum erosion at bed level around vane but these vortices will be
weakened by the horizontal plate situated at the bed level. Horizontal plates
at bed helps to dissipate the energy of vortices and do not allow vortices to
move in to the sediment bed. In case of degradation of bed level takes place
then bottom most plate takes care of vertical plate. These three horizontal
plates controls scour around vertical plate as well as provide stability against
the impact of flow. Normally submerged vertical plates or vanes are damaged
due to scouring so that these vanes are called sacrificial vanes. But assembly
of these plates in Inverted E shaped protects their self as well as protects
river bank erosion. This assembly of these plates is more sustainable for the
longer duration. Once vertical plate or vane is protected from scour, then this
vertical plate will work in the river for a longer duration, stabilizes river banks
or constraining the migration of meanders.
Then the shape of vertical plate was improvised into inverted E shape. This
vertical plate is supported by three horizontal plates at different level of
vertical plate. These horizontal plates strengthen the vertical plate and break
the erosive impact of flow on the plate. As vertical plate is above the bed level
was kept 0.4 times of depth of water. During model testing experimentation,
flow depth(h) was kept 15 cm so that height of vanes above bed was taken 6
cm. Three size of these horizontal plates were tested 0.05h, 0.1h and 0.15h.
Size of horizontal plate of 0.1h was kept which has given better protection
against scour around vanes. These three horizontal plates of sizes 1.5 cm
reduce scour nearly 64% around the vertical plate(vane). Larger size of
horizontal plate shows sign of bending due the impact of vortices. This
arrangement ensures protection of vertical plate which helps in river training
work.

We Claims
1. Inverted vertical E plate bank protection system for river to improvise safety of
river bank protection, comprises of three horizontal plates which are to be
attached at the top edge of vertical plate, at the centre of vertical plate(at bed
level) and at bottom of the vertical plate, three horizontal plates protect
vertical plate from the direct impact of erosive action of water vertical plate is
positioned at the bed level about 0.4 times of depth of water, three size of
these horizontal plates were tested 0.05h, 0.1h and 0.5h reduces scour
nearly 60-70% around the vertical plate(vane).
2. Inverted vertical E plate bank protection system as claimed in claim 1 wherein
size of horizontal plate of 0.1h was kept which has given better protection
against scour around vanes.
3. Inverted vertical E plate bank protection system as claimed in claim 1 wherein
three horizontal plates of sizes 1/10 of flow depth of water reduces scour by
64%.
4. Inverted vertical E plate bank protection system as claimed in claim 1 wherein
plates size more than 1/10 of flow depth of water shows sign of bending due
the impact of vortices.
5. Inverted vertical E plate bank protection system as claimed in claim 1 wherein
material of plates be taken as aluminum, iron, pre stressed concrete.