SCIENTIA GEOGRAPHICA SINICA ›› 2015, Vol. 35 ›› Issue (11): 1444-1451.doi: 10.13249/j.cnki.sgs.2015.011.1444

• Orginal Article • Previous Articles     Next Articles

Reach on Chinese Central City Impervious Surface Area Growth Pattern in Recent 20 Years: Take Nanchang as a Case

Zhi LI1,2(), ZONG-qiang WEI3, Ya-jing LIU1, Zhao CHEN1   

  1. 1. Jiangxi Normal University City Construction College, Nanchang, Jiangxi 330022, China
    2. Management Decision Evaluation Reserch center of Jiangxi Normal University, Nanchang, Jiangxi 330022, China
    3. School of Environmental and Land Resource Management, Jiangxi Agricultural University, Nanchang, Jiangxi 330045, China
  • Received:2015-03-22 Revised:2015-06-10 Online:2015-11-20 Published:2015-11-20

Abstract:

Impervious surface Area (ISA) is an artificial surface as the specific components, mainly by the hard road, parking lot, a square and a roof and other buildings composition in the city. Because isolation of surface water infiltration into the soil, impervious surface can cut the urban surface and subsurface hydrological connection. It is regarded as important elements on process of urban hydrological cycle, thermal cycling, local climate and biodiversity changes, has become an important indicator of urbanization healthy and quality of the city growth. So it increasingly becomes a hot research issues in geography, ecology, urban planning, environmental science and remote sensing information in recent years in China. But the long-term monitoring and longitudinal comparison of impervious surface is a challenging work. Based on the exited correlation between typical samples’ impervious rate, an innovation research method that we called it Reference model of Typical Samples (RTM) was constructed and used to do comparison of impervious surface in historical yearin this article. Besides, the paper examines the impervious surface area growth pattern in recent 20 years in Nanchang main urban areawas applying of Constraint Linear Spectral Unmixing Method(CLSUM). This study shows that the overall development shows the impervious surface area percentage (ISP) increases obviously in Nanchang main urban area in recent 20 years with the percentage of annual increase on 0.09% and the area of annual increase on 32 hatches. The growth pattern shows “decentralized-concentration-diffusion” expanding mode in study area, with the transition of impervious surface high-growth area from urban centers to urban fringe district. The preexisting dominant “road extending” developing mode is gradually transformed into “Satellite filling” mode and “Sporadic enclave” mode, with its contribution of ISP from 23% in 1995 to 11% in 2014 and at the same time Satellite &Sporadic enclavemode contribution to study area ISP from 63% to 71%. From the macro view, the impervious surface pattern evolution was affected by the development of social economy and the spreading of convenient engineering technology and materials. On the micro level, this kind of surface changing is also impacted by land policy, urban planning and the investment of urban construction, et al. The present study found that the excessive growth of impervious surface can be effectively reduced by: 1) Rationally planning city expansion; 2) Paying more attention to the excessive growth of construction land in suburban areas; 3) Promoting the use of green permeable building materials; 4) Developing the new construction technology used for improving permeability. The before-and-after comparison of the impervious surface pattern can be unified into a bench mark by joint applying of RTM and CLSUM, with elimination of certain errors. So the reference model of typical samples lays an analyzing foundation for the long-term monitoring and comparing of urban impervious surface changing.

Key words: impervious surface, pattern evolution, growth pattern

CLC Number: 

  • K903