Preparation of Resettlement on Flash Flood Disaster-free Area in Wasior Using Remote

Sensing Technology

Abdul Wahid Hasyim & Ismail Wahyu Widodo

International Conference Planning In The Era Of Uncertainty 2013

The location

Introduction

1

43

2

Introduction

• Teluk Wondama consists of 7 districts and 53 villages with total area of 4996 km2.

• Wasior covered by dynamic land cover. On the relatively flat slope area, it generally has the land use as residential and other supporting facilities which are not too extensive.

• After the incident flood disaster on Monday, October 4th, 2010 at 08.30 WIB the residential and supporting facilities mentioned were devastated.

Introduction

1

43

2

The research method• The research uses 2 approaches, which are

Geospatial for determining safety zone and Urban Design approach for resettlement pattern guideline based on ecology, social, and culture, and also consideration of building form which is safe facing the disaster based on the existing precedence.

The Process

• Make GCP (Ground Control Point) take many sample (trainning area) on correction image Supervised Classification recheck on the field for the classified data

Maximum Likelihood (ML) Classification approaches written as follows (Tso, B., Mather, P., 2009):

Where, = vector data x probability on class i

= vector data which will be classified = covarian matrix= transpose from vector

The Result

Landsat image before catastrophic flood

Open land classification before catastrophic flood

Total Area per Class before the Flood

Before catastrophe

The ResultChanges of Land Based on Occurance Before and After the Flood

Classification after the Flood

After catastrophe

Total Area of Land Change after the Flood

• Based on classification using ML method on captured images result after the flood, it was obtained that the total area of vegetation was 135.28 km2

• Based on total area calculation, the total area of missing areas which converted to new open spaces were 7.37 km2. On settlement classification, the total area was 11.532 km2, which meant that there had been occurred an increasing number of deforestated land because of flood which damaged 2.013 km2 settlement areas and other city facilities

• The rest of the flood water and soil erosion produced sediment silt that covered an area of 5.352 km2 (symbolized by class red). Damages also occured in water bodies so that they formed a pool from the erosion of land covering an area of 6.744 km2 (symbolized by class blue)

• Changes in land cover (symbolized by class yellow) which occurred after the flood disaster, emerged new openings and increased land erosion that eroded water bodies and caused sediments in the lower reaches of the river. Total area of land change if combined with sediments which were produced was 3.4353 km2

The Result

Using Buffering 200M Technique

• After doing 200m buffering technique, 15 m resolution contour data is involved to find out relatively flat area as shown in Figure 9. So, it can be discovered the relatively flat areas at 5 safe areas, which are: – Area I has total area of 9,6Km2

– Area II has total area of 4,4Km2

– Area III has total area of 2,7Km2

– Area IV has total area of 15,3Km2

– Area V has total area of 24Km2

• Overall, the safe area is 56 Km2. Safe area in question is safe visually through satellite imagery based on the contour, and buffer against the causes of flooding (river).

Disaster Free Areas

• Flood handling • raise the values of local

wisdom • application of public spaces • accommodate aspirations of

economic activities• Accommodate socio-cultural

activities

The Concepts

• The basic design criteria which are used are:• Ecological environment criteria

– The land is capable of supporting activities and building masses

– Vegetations can protect the activity on the site– Regions can be naturally protected and with special

treatment of natural disasters• Socio-Cultural & Economic Criteria

– Good local cultural attachment– Good public acceptance– Minimum conflict of interest– Good accessibility– Economic development opportunities

• Pragmatic Criteria– Design & build art related to safety against floods– Conservation zoning– The uniqueness of the design– Selection of structures which are allowed to be used as

the basis of landscape design in the area of disaster

The Criterias

Referral of the use of Local Wisdom Building for Disaster-prone Areas