/
Luis Leonardo González Jiménez; CE, MSc Luis Leonardo González Jiménez; CE, MSc

Luis Leonardo González Jiménez; CE, MSc - PowerPoint Presentation

debby-jeon
debby-jeon . @debby-jeon
Follow
358 views
Uploaded On 2019-06-20

Luis Leonardo González Jiménez; CE, MSc - PPT Presentation

Jorge Enrique Saénz Samper CE INCIDENCE OF THE NEW BRIDGE CONSTRUCTION OVER THE MAGDALENA RIVER IN BARRANQUILLA COLOMBIA ON THE HYDRAULIC CONDITIONS Pittsburgh USA 1821 September 2017 SMART RIVERS ID: 759313

Share:

Link:

Embed:

Download Presentation from below link

Download Presentation The PPT/PDF document "Luis Leonardo González Jiménez; CE, MS..." is the property of its rightful owner. Permission is granted to download and print the materials on this web site for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.


Presentation Transcript

Slide1

Luis Leonardo González Jiménez; CE, MScJorge Enrique Saénz Samper; CE

INCIDENCE OF THE NEW BRIDGE CONSTRUCTION OVER THE MAGDALENA RIVER IN BARRANQUILLA (COLOMBIA) ON THE HYDRAULIC CONDITIONS

Pittsburgh, USA, 18-21 September 2017

“SMART RIVERS

2017”

Slide2

19-09-2017

“SMART RIVERS 2017”

INTRODUCTION

The objective of the study was evaluating the influence of the new bridge construction on the river hydraulics near the crossing. New bridge is located parallel to the existing one. - Existing bridge: piles arranged in pairs with 2.5m diameter each and 5m diameter for the central piers. - New bridge: span of 380m between central piers, each one supported on a dice with piles of 2.8m diameter.

Slide3

Main Topics Analyzed

19-09-2017

“SMART RIVERS 2017”

1- Water levels at Canchera School2- Hydraulics and scouring at the New Bridge3- Pasadena Channel Hydraulics4- Ahuyama Branch Hydraulics

Slide4

Location

19-09-2017

“SMART RIVERS 2017”

CARIBBEAN SEA

PACIFIC OCEAN

Barranquilla

Barranquilla

MAGDALENA RIVER

Location

New Bridge

N

New Bridge Piles

Barranquilla

To

San Marta

Existing Bridge

Rondón Island

MAGDALENA RIVER

Slide5

Magdalena River General Characteristics

19-09-2017

“SMART RIVERS 2017”

Width of the Magdalena River on site: 1150 mMean Annual Discharge :7200 m3/sDistance to Caribbean Sea: 21 kmManning’s n Main channel: 0.024- Manning’s n Island and banks: 0.035

Slide6

1- Water levels at Canchera School

19-09-2017

“SMART RIVERS 2017”

Canchera School

MAGDALENA

RIVER

Existing Bridge

New Bridge Piles

500 m

aprox

N

Slide7

1- Water levels at Canchera School

19-09-2017

“SMART RIVERS 2017”

Based on the topographic information and the hydraulic modeling, water levels that can be reached by the river and affected property were stablished.

Magdalena

River

Location current Bridge and New Bridge

Aprox

500 m

Hydraulic Profiles

Site closest to

Canchera School

Slide8

1- Water levels at Canchera School

19-09-2017

“SMART RIVERS 2017”

For the construction of the Canchera School, a period return period of 50 years was considered.

Return Period(Years)Water Level (msnm)Protection Level(msnm)51.982.13102.212.36202.402.55502.612.761002.752.90

It was

recommended to

raise the

terrain

level to

a height of 2

masl

. T

he

first floor should start at 2.75

masl

.

Slide9

2- Pasadena channel hydraulics

19-09-2017

“SMART RIVERS 2017”

N

CHANNEL PASADENA

MAGDALENA RIVER

BARRANQUILLA

Slide10

2- Pasadena Channel hydraulics

19-09-2017

“SMART RIVERS 2017”

According to the topography of the area, the channel projected for the

Channel Pasadena in the sector where the camp is located is hydraulically studied. This included hydrology, channel layout and cross-sections.

Hydraulic Modeling - HECRAS

- Design flow -

Tr

50 years: 10.8 m3/s corresponding to 54 ha

Boundary Conditions: Levels in the Magdalena river at the place

of

channel delivery and variation of water levels

by

tide effect.

Manning’s

n

: 0.015, corresponding to concrete

Slopes: 0.12% and 0.64%

Slide11

2- Pasadena channel hydraulics

19-09-2017

“SMART RIVERS 2017”

C

hannel bottom is below the natural terrain as a result of the interference with existing pipes and cross section changes.The possibility of a hydraulic jump for a period of Tr = 50 years and a minimum level in the Magdalena river was considered. Although improbable, it will happen in the lined section of the channel and will be submerged by the water level of the Magdalena River.

Slide12

3- Hydraulic Evaluation and Scouring at the New Bridge

19-09-2017

“SMART RIVERS 2017”

Analysis were conducted to study the behavior of the river at the

project

site during the construction of the new bridge.

This condition is considered the most critical during the next 3 years and which will be at the same time the following structures:

Piles of the existing

b

ridge

Piles of the new

b

ridge

Four temporary jetties for construction of the new bridge

Slide13

3- Hydraulic Evaluation and Scouring at the New Bridge

19-09-2017

“SMART RIVERS 2017”

Rondón Island

Barranquilla

Magdalena

River

Palermo

Rondón Island

380 m

Temporary

jetties

for

construction

of

the

new Bridge

Piles of

the

existing bridge

Piles of

the New Bridge

N

Slide14

3- Hydraulic Evaluation and Scouring at the New Bridge

19-09-2017

“SMART RIVERS 2017”

Piles of the existing bridge = 30 piles

Piles of the new bridge = 54 piles, 2.0m

diam

+ 20 Piles, 2.8m

Four temporary jetties during construction

2*(54

+

75)= 258

piles, 0,90m

diam

.

Slide15

3- Hydraulic Evaluation and Scouring at the New Bridge

19-09-2017

“SMART RIVERS 2017”

Hydraulic

Modeling

New bridge

Existing

b

ridge

Jetty

Jetty

Jetty

Jetty

Magdalena

River

Slide16

3- Hydraulic Evaluation and Scouring of the New Bridge

19-09-2017

“SMART RIVERS 2017”

Model Results

Return Period (years)

Flow

(m

3

/s

)

Water

level

(masl)

Existing bridge Scenario

Scenario during construction

Future scenario only with the New bridge

Original design (2014

)

Jesyca

(2015)

Original design

(2014

)

2

11 819

1.63

1.64

1.63

5

13 790

2.08

2.11

2.09

10

14 800

2.32

2.35

2.33

20

15 619

2.52

2.55

2.53

50

16 521

2.74

2.77

2.75

100

17 111

2.89

2.92

2.89

500

18 279

3.18

3.21

3.18

1000

18 717

3.29

3.32

3.29

Slide17

3- Hydraulic Evaluation and Scouring at the New Bridge

19-09-2017

“SMART RIVERS 2017”

I

t

can be concluded that the effect of the piles

during construction on the

hydraulic behavior of the Magdalena River, is minimal and does not imply any complication from the point of view of changes

in the

water levels

or

the average velocities

in the

central channel

or

the

banks.

Slide18

3- Hydraulic Evaluation and Scouring of the New Bridge

19-09-2017

“SMART RIVERS 2017”

G

eneral scour was estimated by the Lischtvan-Lebediev formulation. Local scour by the formulations in HEC-18 for a composite pile. According to the total estimated scour, the final profile theoretically exceeds the coral rock boundary. Since it is a competent stratum, the scour is limited to rock level.

Longitudinal

profile

main channel

Maximun water level 3.13 masl - Average water level 1.69 masl

Scour estimated assuming sandy bed

Coral rock

Shallow fill

Alluvial filling

Alluvial - Lacustrine filling

Residual Soil 1

Residual

Soil

2

Slide19

4- Ahuyama branch hydraulics

19-09-2017

“SMART RIVERS 2017”

MAGDALENA RIVER

N

BARRANQUILLA

CAÑO AHUYAMA

Existing

dyke

NEW BRIDGE PILES

Slide20

4- Ahuyama branch hydraulics

19-09-2017

“SMART RIVERS 2017”

Another aspect to determine the effect of the area is the influence of the tributaries that reach the Magdalena River, in this case the

Caño

Ahuyama

. Evaluation of

Tr

=100 year discharge was

analized

in respect of the existing dyke.

Two scenarios were

analized

:

-The first one contemplates high levels in the Magdalena river that generate flow towards the

Ahuyama

branch,

- The second one when the

Ahuyama

branch

flows to the Magdalena river because of the runoff from the urban zone.

Slide21

4- Ahuyama branch hydraulics

19-09-2017

“SMART RIVERS 2017”

Scenario

- 1

Flow

DIrection

Projected

Piles

Projected

Piles

CAÑO AHUYAMA

2.92

masl

2.87

masl

Dyke Projection

MAGDALENA RIVER

Q=20 m3/s

Projected

Piles

Flow

Direction

MAGDALENA RIVER

Slide22

4- Ahuyama branch hydraulics

19-09-2017

“SMART RIVERS 2017”

Q=20 m3/s

S

cenario - 2

The most critical condition to evaluate the water levels next to the Ahuyama branch is the Scenario 2.As for the effect of the piles on the Ahuyama branch, this is minimal with over elevations of only 1cm.It is recommended that the existing dyke be raised up to 3.5 masl along its entire length (300 m).

Tr 2 años

Tr 25 años

Q=98.4 m3/s

Flow

Direction

MAGDALENA RIVER

CAÑO AHUYAMA

Projected

piles

Projected

piles

3.13

masl

3.43

masl

Q=55.05 m

3

/s

2.92

masl

Dyke Projection

 

MAGDALENA

R

IVER

Projected

piles

Flow

Direction

Q=55.05 m

3

/s

Q=98.4 m

3/s

Slide23

CONCLUSIONS

19-09-2017

“SMART RIVERS 2017”

The evaluations performed for each of the mentioned scenarios were carried out using a free computational tool in 1 dimension (HEC-RAS). This software was sufficient to estimate levels and affectations in the study areas.

The determination of flood levels for the Canchera School, allowed to have the respective levels from which the new area to be built was projected and thus to avoid damages of floods.In the same way, the modeling made it possible to dimension hydraulic structures such as the Pasadena channel and the dyke along the Ahuyama channel in the right bank.The incidence of the New Bridge in the hydraulic conditions of the area, does not generate a considerable affectation in the water levels and the speeds in the sector in spite of flowing through 362 piles. This is due that most of the piles are in zones near to the banks, where the speeds are smaller than those registered in the center of the main channel.The scour is limited by the coral rock, which is approximately 10 m below the natural bed.

Slide24

19-09-2017

“SMART RIVERS 2017”

Source

: Giovanny Escudero – El Heraldo 16 de Noviembre de 2016