shaping urban spatial structure

SHAPING URBAN SPATIAL STRUCTURE From Policy to Energy Consumption by : Beta Paramita 1 Cities in Asian countries have many similarities in regard to its form and shape, especially in the south-east Asian regions. The history of the city trace back along the transportation stripe (mainly rivers) with its linear character. Singapore, Indonesia, Malaysia, Thailand, Vietnam, Cambodian, and Philippine were have a main river in their major cities respectively. Water was become the main reason for some people to build their houses along the river. It is interesting to discuss the urban spatial structure since cities growth patterns are undergoing quantitative and qualitative change. For the last two centuries, cities have been sprawling out, then the process of decentralization has taken a more polycentric form, with a number of concentrated employment centers making their mark on both employment and population distribution. 2Indonesia with around 240 million people inhabitant, as the 4th populous country in the world is facing demography’s problem on an urban spatial structure associated with the population growth, such as land use, water supply, equipping settlement and its facilities. This paper will describe the correlation between the spread of the city growth, urban spatial structure, spatial policies and regulations and then finally the urban energy consumption. Overcrowded residential areas along Cikapundung River in the middle of Bandung City will be taken as a case study.

(keywords: urban spatial structure, spatial policies, energy consumption)

A. Introduction 1. Urban Structure Urban structure was established as the result of complex sources, such as: history, economy, politic as well as its unique character of urban geomorphology. Gradually, all of these aspects will create some demographic problems of the city like overcrowded population, needs of land, limited access to clean water, bad sanitation and city infrastructures as well as lack of public spaces, including green open space. The physical aspect of urban structure is the urban form, and it is closely related to scale and has been described as the ‘morphological attributes of an urban area at all scales. (Williams et al., 2000) 2

Urban form generally encompasses a number of physical features and nonphysical characteristics including size, shape, scale, density, land uses, building types, urban block layout and distribution of green space. 3

1

Doc. student at Kitakyushu University, Lecturer at Indonesia University of Education, researcher and professional at urban design and environmental science 2 In Jenks, Mike, 2010 3 Jenks, Mike, 2010

Density, will be the most crucial elements of urban form, such as land use and access to services – for example, for a service or facility to be viable, it needs to serve a population of a particular size. Density, on the one hand, can be seen as an outcome of the competition between land uses within a given urban transport infrastructure and its associated pattern of accessibility. On the other hand, it is a policy goal as it is also an input into the quality of urban life through the viability of services provision and availability of public and private space. Density has therefore been used as a tool to measure the viability of public transport infrastructure and other service provision, the feasibility of certain land uses, particularly commercial and service, in urban design and construction. At what point density becomes high (or too high) is unclear, but in recent years planning policy and practices in many countries have been attempting to increase the average density of new development.

Thus, this paper tries to describe the relationship between urban form and sustainable development, which have a strong effect to energy use. In particular, it outlines a typology of city forms. The three main archetypal urban forms discussed are: the linear city; the city set out in the form of a grid; and the highly centralized or inward-looking city. The regularities and irregularities of urban structure on this paper will be described by using land-use in 2009 of Bandung City, and it will be explained in the degree of spatial concentration of urban population and the form of town. The research concentrates on the physical design of urban form with respect to: physical configuration and layout, including links to the wider urban system; its land uses and functions; the typology and density of built form.

2. Urban Settlement in Bandung Bandung is mention as the most attractive city in Indonesia, this city as never sleep. The distance from Jakarta is about the 128km or 3hours trip. It made Bandung as backyard of Jakarta citizen. The population of Bandung City is 2.329.928 persons, which determines the growth rate 1,88%. The average of population density in Bandung City is 13.927,48 pr/sq. This density is not including the commuters from a periphery who work to Bandung in a day, and there will be around 3 million in Bandung in working hours. The limited land and the high demand of land then made Bandung is facing the demographic problem associated

with the population growth, such as land use, water supply, equipping settlement and its facilities.

Highly centralized

Fig. 1 Land use of Bandung city, 2003 Source : BPN (National Land Administration Agency)

In 2000, land use for settlement has already occupied 53% of total land use, which is 8.866.715 ha and accommodate for 2.136.260 inhabitant of Bandung citizen. In 2013, the planning of land use for settlement already set maximum 60% of total Bandung’s land, which is 10.037. 790ha and prepared to accommodate for 2.944.860 inhabitant. The land's rest is counted as 1.171.075ha, which is very limited land compare to the inhabitant who is needed to be settled, the other problem that may have to face is the spread of the inhabitant in Bandung wasn’t in the same amount and condition. The dense district is Bojongloa Kaler with 39.240pd/km2 and the lowest dense district is Arcamanik with 782.5pd/km2. The limited land then became the most problem in Bandung in supplying house demand, with the population increasing from year to year. It's become urgent matters to be addressed. The number of urbanization, limited subsidized house, uncontrolled birth and the other helplessness of demography’s problem are such a classic problem in big city-like Bandung,

its force incompetent citizens to supply their demands as their own ways and the other hand infirmness of the legal aspects could not clearly be operated. The urban structure of Bandung now, is the result of stack of the land use problem, which create the dense and tend to slum area.

B. Urban Structure as The Result of Historical and Political Will The layouts of today’s cities are largely

1

artifacts of their historical development and planning and building regulations. The configuration of the street network, in terms of its urban block sizes, their overall location within the city, pedestrian and vehicular

connectivity,

can

affect

the

functioning of a city by, for example, influencing the location intensity of activities (Penn et al., 1998; Porta et al., 2008).

1. Density and Land-use As one element of urban form of the most influential in shaping the structure of the city, it is necessary to set out the measurement and assessment of the density of a city. See population density of Bandung at Table 1. Recent moves towards the creation of more sustainable towns and cities that offer a high quality of life whilst minimizing resource consumption (such as energy, land and water), have reawakened interest in the concept of density. The benefits of seeking higher-density levels in overall terms are well recognized especially in the context of delivering mixed-use development where a minimum housing density is required to sustain non-residential uses.

4

the mass around centers, public transport access points, parks and river fronts, for example. 4

llewelyn – davies, Urban Design Compendium,2001

It should be shaping the mass of built form to frame positive, but unfortunately somehow in the

high

dense

area,

this

artifact

resulting

in

negative

scenery

of

a

city.

In contrast, much recent development, which may have exactly the same population density of its traditional counterpart, is characterized by flat, featureless density profiles. This is the product of building down to imposed standards or density levels, such as 25-30 dwellings or 150 - 200 habitable rooms per hectare. Built form is distributed and density bumps ironed out.

2. Slum, an Excess of Density Density is a measure. How comfortable a place feels is a matter of the design and its social characteristics. Somehow, overcrowded is closely to slum area, since the high needs of a land and infrastructure requirements which is often neglected by local government also the growth rate of building that do not meet the rule of building regulation. That condition then shows in the urban spatial structure as an unplanned area. The density of population and building should be equilibrated with the equipping of infrastructure, if there is no powerful policy to settle down the accretion of building or the urban sprawl, so that would be crashed with urban land use and also give impact to urban form, which is finally set up the urban structure irregularly and could be said as a slum area. The definition of slum area by UN Habitat: slum is an area that combines to various extents the following characteristics, such as : a. Inadequate access to safe water b. Inadequate access to sanitation and other infrastructure c.

Poor structural quality of housing

d. Overcrowding e. Insecure residential statue In Indonesia, slum area is defined by 6(six) criteria, which are: 5 a. Vitality area in non economic aspect (congruity with urban planning, physical condition of building, demographic condition) b. Vitality of economic aspect (existence to the surrounding, distance to activity, function of surrounding area) c. 5

Land statue (domination of legal aspect, domination of ownership of land)

Guidelines for Identification of Slum Settlement Area in Metropolitan-Ring Buffer, 2006

d. Infrastructure (street, drainage, water service, sewage, solid waste) e. Government commitment ( institutional, fund) f.

Priority of handling the problem (management plans, physical improvement)

From the criteria above, urban form of Bandung will be accessed to measure the physical quality and to classify area (district) as an urban artifact. The density tend to slum, if the building in 1ha more than 100unit, and habitable room more than 25unit/ha. To assess the dense area as a slum area, it is made a typology of housing which is divided into 3 typologies with their characteristics, and shown in table 2.

Table 2. Typology Slum Settlement Based On Physical Characteristic No 1

Typology High slum

Code HS

Characteristic Settlement area with water service less than 30%, condition of outer main of sewage and drainage less than 30%, the breakage of neighborhood street and connection more than 70%. Building density more than 100 unit/ha, the distance between building less than 1m, Building Coverage (BC) more than 70% without open space in the neighborhood. The growth of building construction in a high rate. 2 Medium MS Settlement area with water service between 30-60%, condition of slum outer main of sewage and drainage 30-60%, the breakage of neighborhood street and connection are 50-70%. Building density between 80-100 unit/ha, the distance between building are 1,5-3 meter, Building Coverage (BC) 50-70%. The growth of building construction in a medium rate. 3 Low slum LS Settlement area with water service more than 60%, condition of outer main of sewage and drainage more than 60%, the breakage of neighborhood street and connection are less than 50%. Building density less than 80 unit/ha, the distance between building are more than 3 meter, Building Coverage (BC) less than 50%. The growth of building construction in a low rate. Source : Guidelines for Identification of Slum Settlement Area in Metropolitan-Ring Buffer, 2006

The assessment of physical quality of urban form in Bandung can be seen in table 3 Table 3 Slum settlement in Bandung No

1

Typology

High Slum

Code

HS

District Astana Anyar Bojongloa Kidul Bandung wetan Kiaracaondong Sumur bandung Bojongloa kidul Coblong Cinambo Rancasari Sukasari Sukajadi

2

Medium Slum

MS Cicendo Andir Buah batu Cibeunying kidul Sumur bandung Antapani Mandalajati Batununggal Astana anyar Bojongloa kaler Cidadap Rancasari Lengkong Bandung kidul Ujung berung Panyileukan Gedebage

3

Low Slum

LS

Cibiru Cicendo Andir Bandung kulon Babakan ciparay Cibeunying kidul Cibeunying kaler

Regol Arcamanik Source : Field Data Observation, 2009

Slum Settlement Area Sub District Nyengseret Situsaeur Taman sari Babakan Surabaya Braga Cibaduyut kidul Dago Lebak siliwangi Sekeloa Cisantren wetan Manjahlega Isola Cipedes Sukabungah Arjuna Pajajaran Husein sastranegara Ciroyom Cijaura Cikutra Babakan ciamis Antapani wetan Karang pamulang Kebonwaru Panjunan Jamika Ciumbeuluit Hegarmanah Derwati Paledeng Kujangsari Cigending Cipadung wetan Rancanumpang Rancabolang Cipadung Sukaraja Campaka Maleber Cigondewah kaler Cigondewah kidul Babakan Cicadas Sukapada Cigadung Sukaluyu Ciseureuh Cisantren kulon

RT/RW 5 15 8 6 15 16 3 3 6 6 5 10 1 8 3 5 2 11 2 6 13 3 8 5 13 5 3 7 7 2 3 3 4 2 4 2 3 10 5 7 6 8 9 15 3 1 4 5

Fig.3. Slum Area in Sumur Bandung District Source : Final Report, Slum Area in Bandung, 2009

Fig. 4 Slum Area in Cicendo Sub-District Source : Final Report, Slum Area in Bandung, 2009

Fig. 5 Slum Area in Cibeunying Kidul District Source : Final Report, Slum Area in Bandung, 2009

C. Environment and Energy Implication The negative effects from the inner to the use of energy and its impact on the environment and energy consumption still requires further research, but at least here can be described in general, the impacts that occur every day in the slums The lack of open space in the slum area, give a complex impact to many aspects, such as: 1.

The availability of daylight, which means people in this area, live in the dark and the demands of electricity much greater

2.

The high of temperature and also humidity inside the house force them to use fan to make the better air circulation. Bandung is tropical city, so the highest temperature (day) is average

32ºC

and the lowest (night) 19ºC and the humidity reach between 70-90%. 3.

The limitation of area of infrastructure placement made the absence of sewerage lines, either overflow of rain water, dirty water from house, in some case all this liquid waste is directly pour to river.

4.

No access for waste transport vehicle, accumulate of solid waste. In some river bank settlement, the solid waste discharged into the river whereas the river is a source of clean and drinking water for Bandung. Beside for clean and drinking water, Cikapundung River is one of river which is supplying for hydroelectric-power, which is downstream to Citarum River. There are three hydroelectric-power using water discharge Citarum watershed as its supply, i.e. hydroelectric-

power Ir H. Juanda (Jatiluhur), Hydroelectric-power Saguling, and hydroelectric-power Cirata. Hydroelectric-power plant supplying electricity to the island of Java, Madura, and Bali. Calculations obtained from the three hydropower in Citarum river flow was produced energy equivalent fuel oil by 16 million tons / year 5.

No space for social activity, this is bad for children because they lost their space for playing, and also people live here sometimes neglected between private or public space

Some of urban structure problem in slum area could be seen as figure below :

Fig. 6 (up) Distance between building