Land-Use Change and Flood Risk Transformation in Urban Area

2019 ◽  
pp. 189-201
Author(s):  
Shigeko Haruyama
Keyword(s):  
Land Use ◽  
Land Use Change ◽  
Urban Area ◽  
Flood Risk ◽  
Risk Transformation

scholarly journals Link between Land Use and Flood Risk Assessment in Urban Areas

Proceedings ◽  
2020 ◽  
Vol 30 (1) ◽  
pp. 62
Author(s):  
Zahra Kalantari ◽  
Johanna Sörensen
Keyword(s):  
Land Use ◽  
Land Use Change ◽  
Green Infrastructure ◽  
Flood Risk ◽  
Urban Areas ◽  
Land Use Changes ◽  
Drainage System ◽  
Property Owners ◽  
Pluvial Flooding ◽  
The Impact

The densification of urban areas has raised concerns over increased pluvial flooding. Flood risk in urban areas might increase under the impact of land use changes. Urbanisation involves the conversion of natural areas to impermeable areas, causing lower infiltration rates and increased runoff. When high-intensity rainfall exceeds the capacity of an urban drainage system, the runoff causes pluvial flooding in low-laying areas. In the present study, a long time series (i.e., 20 years) of geo-referenced flood claims from property owners has been collected and analysed in detail to assess flood risk as it relates to land use changes in urban areas. The flood claim data come from property owners with flood insurance that covers property loss from overland flooding, groundwater intrusion through basement walls, as well as flooding from drainage systems; these data serve as a proxy of flood severity. The spatial relationships between land use change and flood occurrences in different urban areas were analysed. Special emphasis was placed on examining how nature-based solutions and blue-green infrastructure relate to flood risk. The relationships are defined by a statistical method explaining the tendencies whereby land use change affects flood risk.

scholarly journals Spatial Transformation of New City Area: Economic, Social, and Environmental Sustainability Perspective of Makassar City, Indonesia

2020 ◽  
Vol 55 (3) ◽  
Author(s):  
Batara Surya ◽  
Syafri ◽  
Herminawaty Abubakar ◽  
Hernita Sahban ◽  
Harry Hardian Sakti
Keyword(s):  
Land Use ◽  
Sustainable Development ◽  
Land Use Change ◽  
Urban Area ◽  
Urban Areas ◽  
Population Increase ◽  
Spatial Transformation ◽  
Spatial Expansion ◽  
City Area ◽  
New City

The spatial transformation of new urban areas into industrial urban areas impacts spatial structure, spatial patterns, and environmental degradation. This study aims to analyze the spatial transformation work as a determinant of the development of the new urban area of Metro Tanjung Bunga Makassar and analyze the relationship of spatial expansion, land use change and population increase for the growth of new city areas and the sustainable development of the Metro Tanjung Bunga area, Makassar city. The data for this study has been obtained through observation, surveys and documentation. The research approach used is a sequential explanation. According to the results, that excessive urbanization and maximum compaction led to spatial expansion towards the development of the new urban area of Metro Tanjung Bunga. Moreover, the increase in number has a dominant influence with a value of 32.3% on the growth of the new city area of Metro Tanjung Bunga, Makassar City. Spatial expansion, land use change, and population increase were determinants of growth factors in the new urban areas and they also had a significant impact on environmental quality degradation. This study recommends the importance of considering the impact of new urban spatial areas for the formulation of strategic policies on sustainable development as an effort to meet national development targets for the case of Metropolitan Cities in Indonesia.

Land-use change and floods: what do we need most, research or management?

2002 ◽  
Vol 45 (8) ◽  
pp. 183-190 ◽  
Author(s):  
Arne Tollan
Keyword(s):  
Land Use ◽  
Land Use Change ◽  
Flood Risk ◽  
Human Impacts ◽  
Management Strategies ◽  
Flood Management ◽  
Flood Damage ◽  
Flood Frequency ◽  
Small Scale ◽  
Infiltration Capacity

Land-cover change (urbanisation, deforestation, and cultivation) results in increased flood frequency and severity. Mechanisms include reduced infiltration capacity, lower soil porosity, loss of vegetation, and forest clearing, meaning lower evapotranspiration. Major research challenges lie in quantification of effects in terms of flood characteristics under various conditions, ascertaining the combined effects of gradual changes over long time periods, and developing model tools suitable for land-use management. Large floods during the 1990s gave a new focus on these problems. Reference is made to the Norwegian HYDRA research programme on human impacts on floods and flood damage. The paper concludes that land-use change effects on floods are most pronounced at small scale and for frequent flood magnitudes. Model simulations of effects of land-use change can now be used to reduce flood risk. Modern flood management strategies have abandoned the position that dams and dikes are the only answers to mitigating flood disasters. Today, the strategic approach is more often: do not keep the water away from the people, keep people away from the water. Flood management strategies should include flood warnings, efficient communication, risk awareness, civil protection and flood preparedness routines, effective land-use policies, flood risk mapping, … as well as structural measures.

scholarly journals Perubahan Penggunaan Lahan Terhadap Banjir di Kawasan Daerah Aliran Sungai Maros

2021 ◽  
Vol 3 (2) ◽  
pp. 52-59
Author(s):  
Ridwan Latief ◽  
Roland A. Barkey ◽  
Muh. Iqbal Suhaeb
Keyword(s):  
Land Use ◽  
Land Use Change ◽  
Urban Area ◽  
Linear Regression Analysis ◽  
Analysis Method ◽  
Watershed Area ◽  
Catchment Areas ◽  
Map Analysis ◽  
Water Catchment ◽  
Reduced Water

Kawasan perkotaan di Kabupaten Maros dilalui oleh Sungai Maros. Aliran Sungai Maros mengalir menuju Selat Makassar dan merupakan muara bagi sungai-sungai lain di bagian hulu. Sungai Maros yang melalui kawasan perkotaan memiliki daerah aliran sungai yang sangat rentan untuk dialihfungsikan. Pertumbuhan alih fungsi lahan non terbangun menjadi terbangun secara fakta marak terjadi pada kawasan daerah aliran sungai Maros. Kawasan daerah aliran sungai yang terbanguni berpotensi menyebabkan gangguan ekologis dan hidrologis yang berdampak pada terjadinya banjir karena berkurangnya lahan resapan air serta berubahnya morfologi daerah aliran sungai. Tujuan pertama penelitan ini adalah mengetahui kondisi penggunaan lahan terbangun serta perubahannya dalam kurung waktu 5 tahun terakhir di kawasan Daerah Aliran Sungai Maros menggunakan metode analisi tumpang tindih peta. Tujuan kedua adalah mengkaji pengaruh perubahan penggunaan lahan terbangun terhadap banjir di kawasan Daerah Aliran Sungai Maros dengan menggunakan analisis regresi linear sederhana. Variabel prediktor yang digunakan yaitu perubahan penggunaan lahan (X), dengan variabel kriterium adalah luas banjir (Y). Hasil penelitian menunjukkan bahwa perubahan penggunaan lahan terbangun pada kawasan daerah aliran sungai Maros mengalami peningkatan yang cukup tinggi, dimana lahan kebun yang berubah menjadi permukiman sebesar 18,4 ha. Sedangkan sawah yang berubah menjadi permukiman sebesar 3,68 ha dari tahun 2015 ke tahun 2019. Perubahan penggunaan lahan terbangun yang terjadi berpengaruh kuat dan signifikan terhadap peningkatan luas genangan banjir pada kawasan daerah aliran sungai Maros. The urban area in Maros Regency is traversed by the Maros River. Maros River flows towards Makassar Strait and is the mouth of other rivers in upstream. Maros River which passes through the urban area has a watershed river that is vulnerable to conversion. The growth of conversion of non-built land into built-up areas in fact is rife in Watershed Maros. Developed watershed areas have the potential to cause ecological and hydrological disturbances that have an impact on flooding due to reduced water catchment areas and changing morphology of river basins. The first objective of this research is to determine the conditions of built-up areas and changes within the last 5 years in the Watershed Maros using overlapping map analysis method. The second purpose is to examine the effect of changes in built-up land use on flooding in Maros watershed area using simple linear regression analysis. The predictor variables used are land use change (X), with the criterion variable is the flood area (Y). The results showed that the land use change was built on the watershed area of Maros has increased quite highly, where 18.4 ha of land has been converted into a settlement. While the rice fields are changed to a settlement of 3.68 ha from 2015 to 2019. Changes on the use of built-up land that occurs have a strong and significant effect on increasing the area of  flood inundation in the watershed area of Maros

scholarly journals River flood risk in Jakarta under scenarios of future change

2016 ◽  
Vol 16 (3) ◽  
pp. 757-774 ◽  
Author(s):  
Yus Budiyono ◽  
Jeroen C. J. H. Aerts ◽  
Daniel Tollenaar ◽  
Philip J. Ward
Keyword(s):  
Climate Change ◽  
Land Use ◽  
Land Use Change ◽  
Sea Level Rise ◽  
Sea Level ◽  
Land Subsidence ◽  
Flood Risk ◽  
Risk Model ◽  
River Flood ◽  
Increase In Risk

Abstract. Given the increasing impacts of flooding in Jakarta, methods for assessing current and future flood risk are required. In this paper, we use the Damagescanner-Jakarta risk model to project changes in future river flood risk under scenarios of climate change, land subsidence, and land use change. Damagescanner-Jakarta is a simple flood risk model that estimates flood risk in terms of annual expected damage, based on input maps of flood hazard, exposure, and vulnerability. We estimate baseline flood risk at USD 186 million p.a. Combining all future scenarios, we simulate a median increase in risk of +180 % by 2030. The single driver with the largest contribution to that increase is land subsidence (+126 %). We simulated the impacts of climate change by combining two scenarios of sea level rise with simulations of changes in 1-day extreme precipitation totals from five global climate models (GCMs) forced by the four Representative Concentration Pathways (RCPs). The results are highly uncertain; the median change in risk due to climate change alone by 2030 is a decrease by −46 %, but we simulate an increase in risk under 12 of the 40 GCM–RCP–sea level rise combinations. Hence, we developed probabilistic risk scenarios to account for this uncertainty. If land use change by 2030 takes places according to the official Jakarta Spatial Plan 2030, risk could be reduced by 12 %. However, if land use change in the future continues at the same rate as the last 30 years, large increases in flood risk will take place. Finally, we discuss the relevance of the results for flood risk management in Jakarta.

scholarly journals Drivers of flood risk change in residential areas

2012 ◽  
Vol 12 (5) ◽  
pp. 1641-1657 ◽  
Author(s):  
F. Elmer ◽  
J. Hoymann ◽  
D. Düthmann ◽  
S. Vorogushyn ◽  
H. Kreibich
Keyword(s):  
Land Use ◽  
Land Use Change ◽  
Flood Risk ◽  
Flood Hazard ◽  
Residential Buildings ◽  
Economic Effects ◽  
Dominant Factor ◽  
Residential Areas ◽  
Land Use Patterns ◽  
Land Use Scenario

Abstract. The observed increase of direct flood damage over the last decades may be caused by changes in the meteorological drivers of floods, or by changing land-use patterns and socio-economic developments. It is still widely unknown to which extent these factors will contribute to future flood risk changes. We survey the change of flood risk in terms of expected annual damage for residential buildings in the lower part of the Mulde River basin (Vereinigte Mulde) between 1990 and 2020 in 10-yr time steps based on measurements and model projections. For this purpose we consider the complete risk chain from climate impact via hydrological and hydraulic modelling to damage and risk estimation. We analyse what drives the changes in flood risk and quantify the contributions of these drivers: flood hazard change due to climate change, land-use change and changes in building values. We estimate flood risk and building losses based on constant values and based on effective (inflation adjusted) values separately. For constant values, estimated building losses for the most extreme inundation scenario amount to more than 360 million € for all time steps. Based on effective values, damage estimates for the same inundation scenario decrease from 478 million € in 1990 to 361 million € in 2000 and 348 million € in 2020 (maximum land-use scenario). Using constant values, flood risk is 111% (effective values: 146%) of the 2000 estimate in 1990 and 121% (effective values: 115%) of the 2000 estimate for the maximum land-use scenario in 2020. The quantification of driver contributions reveals that land-use change in the form of urban sprawl in endangered areas is the main driver of flood risk in the study area. Climate induced flood hazard change is important but not a dominant factor of risk change in the study area. With the historical exception of the economic effects in Eastern Germany following the German reunification, value developments only have minor influence on the development of flood risk.

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