Disaster Preventive Geodesic Dome: The Best Home for Coastal People of Bangladesh

Md. Hafiz Iqbal PhD Researcher, Bangladesh University of Professionals (BUP)

E-mail: vaskoriqbal@gmail.com

Session 18: DISASTER MANAGEMENT

10 January 2018 Independent University, Bangladesh (IUB)

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Coastal livelihood are badly hampered by cyclones and storm surge

o Bangladeshi cost is vulnerable to strong intensity of cyclones and storm surges

o Costal housing sector of Bangladesh is highly affected by cyclones and storm surges

o Total housing damage was estimated BDT.57.9 billion(US$ 839 million) Nearly

537,775 house holds’ dwelling(15%) of the 3.5 million house holds were completely

destroyed by SIDR.

o 854,224 (24%) were partially damaged by SIDR

Data: UNICEF 2007

Background

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Rectilinear housing shape in coastal region enhanced vulnerability

Housing structure

Jhupri type

Kutcha

Semi Pucca

Pacca

Background

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Background

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Preventive Measure

How can we protect housing of coastal households from natural hazards like floods, cyclones, storm surges….?

Smart Answer: Goedesic dome Goodesic dome is created by connecting a mesh of triangular panels together in order to closely resemble a hemisphere It is similar to the rooftop dome of the mosque or shell-like structure without supporting interior columns It is constructed under the consideration of proper distribution of wind loads, static loads and pressure on the surface

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1V frequency

2V frequency

4V

frequency

6V

frequency

Hemisphere

Structural Modeling of Geodesic Dome

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Structural Modeling of Geodesic Dome

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Measurement unit Area required

Surface area Feet 1284.81

Floor area Feet 631.87

Diameter Feet 28.60

Circumference Feet 88.37

Struts Feet 7.81 & 8.84

Concrete pillar Feet 8 (from surface)

Table: Structural modeling of 2V frequency geodesic dome

Source: Calculated by the authors based on http://geo-dome.co.uk/2V_tool.asp

Structural Modeling of Geodesic Dome

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Structural Modeling of Geodesic Dome

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Structural Modeling of Geodesic Dome

Source: Prepared by the author, 2017

Figure: External view of 2V frequency geodesic dome

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Effectiveness & Benefits of Geodesic Dome

2V frequency dome is more effective for 2 or 3 bed rooms, porch,

toilet, cooking space, rainwater harvesting tank for emergency usage

and entry space

It is convenient & suitable for small households

It is more energy efficient and minimize the wastage of land

Household can also use ground space of the dome such as living,

cattle house and warehouse

Its construction cost is very low

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Objectives

To find out the determinants of geodesic dome

To evaluate the effectiveness of a 2V frequency geodesic dome

with respect to sensitivity (cost-benefit) analysis

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Figure : Study area map

STUDY AREA

(Source: prepared by the author

based on his collected GPS 2016)

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Methodology & Research Plan

Sampling technique & questionnaire survey

Cluster sampling

Questionnaire survey

n=172

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Box-Cox Transformation

Linear regression model

Sensitivity analysis (NPV)

Methodology & Research Plan

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Results & Discussion

Variables Description Category Hypothesized relationship

pgd (outcome variable) Geodesic dome Dummy

inc (control variable) Monthly income Continuous +

age (control variable) Age Continuous +/-

fmb (control variable) Family member Continuous _

edna (control variable) Educational attain. Continuous +

rlb (control variable) Residential location Continuous + from Bengal Bay

Table : Description of variables and their hypothesized relationship between outcome variable

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Results & Discussion

Variables Coefficient Standard error P-value

constant 1.39701*** 0.45987 0.0000

ln inc 0.17983** 0.70932 0.0419

ln age 0.33268 0.32097 0.1407

ln fmb 0.09874** 0.50285 0.0700

ln edna 0.22052* 0.64717 0.1009

ln rlb 0.47084*** 0.17091 0.0000

Peseudo R2 0.52903

Number of observations (n) 172

Table : Estimated model for determinants of geodesic dome

Note. P***<0.01 or 1%, P**<0.05 or 5% and P*<0.1 or 10% indicate the level of significance

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Results & Discussion

Cost Return in period 10 NPV

1284.81 feet rectilinear home 150,000 Tk. 333,333 Tk. 183,333 Tk.

(Semi permanent home)

1284.81 feet geodesic dome 65,000 Tk. 277,778 Tk. 212,778 Tk.

Table : NPV for construction of rectilinear home and geodesic dome

Note: Rate of exchange (ROE): US$ 1=BDT 82.0744

(Source: Estimated by the authors, 2017)

More return generated from geodesic dome

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Policy Implications

Government intervention, perception and motivation of coastal people are highly required for

more construction of geodesic dome in the coastal region of Bangladesh.

Government can and provide housing loan and other institutional support to the poor coastal

people for construction of geodesic dome.

Government and NGOs can encourage coastal people through procession, demonstration and

media to demonstrate the benefits of geodesic domes.

Engineering institutions and department are working as a key actor to provide appropriate

guidelines to construct geodesic domes in the coastal region of Bangladesh.

Final Words

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This slide is made possible by the support of American people through the United States Agency for International Development (USAID). The contents are the sole responsibility of the presenter and do not necessarily reflect the views of USAID or the United States government.

Dome is the best home for coastal habitat