EFFECTS OF LAND USE POLICIES ON KARST DISTURBANCE IN URBAN AREAS

2019 ◽  
Author(s):  
Brittiny Paige Moore ◽  
2013 ◽  
Vol 8 (1) ◽  
pp. 084596 ◽  
Author(s):  
Zhongchang Sun ◽  
Xinwu Li ◽  
Wenxue Fu ◽  
Yingkui Li ◽  
Dongsheng Tang

Urban Studies ◽  
2017 ◽  
Vol 55 (13) ◽  
pp. 3012-3033 ◽  
Author(s):  
Wenjia Zhang ◽  
Ming Zhang

This article develops an analytical framework to connect the theories of market and planning failures with the reasoning of incorporating land use and pricing policies for reducing driving and car dependence. A multilevel multinomial logit model (MML) is applied to estimate the effects of neighbourhood land use characteristics and price variables on travel mode choice of non-work trips and their interaction effects in the city of Austin, Texas. Results reveal that pricing policies are more efficient for reducing auto travel while land use policies appear better for adjusting non-auto travel. The practical significance of land use policies for reducing car dependence are more reflected in the modified effects of land use on pricing elasticities of driving probability. Pricing policies are more effective for reducing driving in neighbourhoods with a higher sidewalk density and a better accessibility to mixed-use activity centres. These findings validate the theoretical analysis and demonstrate the importance of coordinating land use and pricing policies together in the transportation planning practice.


Author(s):  
Tran Minh Tung

Urban renewal projects are becoming more and more active, especially in public-owned gold land plots in Vietnam's cities center. The re-development of these land resources known as the residentialization: transformation of different land-use functions into new residential areas (also new neighborhoods) - the KDTM ({Khu Do Thi Moi} abbreviated in Vietnamese) - is increasing the urban density in these areas. Vietnam uses three factors to control urban density: building density; number of floors and/or height of the building; floor area ratio. The current tasks of land-use policies are the determination of an urban density that can adapt to the development of urban space; take full advantage of the land value increment, boost investments without causing any consequences because of the overcrowded population. The residential units will be called compact units when their (occupancy) density exceeds the threshold of 300 persons/ha. For the Compact-KDT concept (compacted KDTM), it is recommended to have: (1) the average level of compactness corresponding to the density of 300 to 600 persons/ha; (2a) the high level of compactness to be controlled - 600 to 1200 persons/ha; (2b) the high level of compactness to be strictly controlled and applied in some exceptional cases - 1200 to 2000 persons/ha; (3) the extremely high level of compactness to be avoided - more than 2000 persons/ha. A Compact-KDT always guarantees the functions of a "normal" KDTM, there are some functionalities that should be added: organization of land-use and spatial functions; public spaces; internal traffic; and reducing energy consumption and the use of non-recyclable natural resources. Rather than being passive to fluctuations in urban density, this increase can be accommodated with a calm and fair attitude by analyzing adverse consequences and the benefits of this process, not just negative effects for the development of urban space, the concentration of population and the economic growth of cities. Keywords: urban renewal; urban density; new urban areas/new residential areas (KDTM - Khu Do Thi Moi); residentialization; (new) compact urban areas (Compacted KDTM/Compact-KDT).


2021 ◽  
Vol 7 (2) ◽  
pp. 163-198
Author(s):  
Madeline Marguerite Byers

Local environmental improvement plans are increasingly popular among urban planners. As climate change and environmental justice concerns increase, many communities demand a change in local land use policies that put these concerns at the forefront. One such community is the city of Houston, Texas, which issued several environmental improvement plans in recent years after the devastation of Hurricane Harvey. As used in this Comment, an environmental improvement plan is a local government planning initiative that aims to implement positive environmental change in urban areas historically burdened by environmental hazards. Such neighborhoods are often undeveloped, low-socioeconomic communities blighted by an accumulation of hazardous pollutants. These communities lack open, green space, clean and affordable natural resources, and resiliency against natural disasters. However, when cities successfully implement environmental improvement plans, targeted neighborhoods often undergo gentrification, thereby displacing the poorer community members into another area blighted by the same environmental hazards the plan was intended to protect them from. This Comment seeks to explore the intended benefits of Houston’s various environmental improvement initiatives, to evaluate the current gentrification trends in Houston neighborhoods targeted for improvement, and to highlight the potential future concerns for vulnerable Houston neighborhoods as these new land-use policies go into effect. Environmental improvement plans are an important and necessary aspect of responsible and sustainable development, but, if implemented without regard to possible gentrification effects, they can have negative, unintended consequences on a city’s diversity and economic health. Fortunately, there are ways that city planners and community members can mitigate these negative effects and ensure positive change and inclusive growth.


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