河谷地形下兰州市城市热岛效应的时空演变研究

doi:10.13249/j.cnki.sgs.2012.012.1530

Abstract

Abstract:

With the progress of urbanization, Urban Heat Island (UHI) has been becoming a key factor in deteriorating the urban ecological environment. Studying spatial-temporal evolution and its cause of typical area′s UHI and quantitatively evaluating effect from rapid urbanization on urban heat environment will provide theoretical foundation for relieving UHI effect and also have some useful reference value for ecological environment planning of urban planning. Based on LandsatETM+ and TM images of Lanzhou in 1999 and 2010, with the aid of GIS and RS, this article has retrieved the land surface temperature (LST) of Lanzhou City by Qin’s mono-window algorithm, and then analyzed spatial-temporal pattern and evolution characters of UHI in Lanzhou City in this decade, and the results show that: 1) The spatial pattern and stretch of UHI are consistent with distribution of built district in Lanzhou City. With the expansion of built district, UHI area constantly expanded and the area of less medium temperature and medium temperature had a large reduction, accordingly, the area of less high temperature and high temperature had a large increase, and consequently UHI intension obviously enhanced. Also, as building density of urban area has been increasing gradually, besides land use/covers type, low temperature belt caused by the Yellow River has been becoming a key factor in affecting the spatial pattern of UHI, and within a certain distance, it has the trend that LST tends to go down from the Yellow River to both sides. 2) From 1999 to 2010, average LST of each land use/cover type had a increase, and LST of different land use/cover type had obvious difference. LST of urban construction land and unused land was the highest, and they had the largest contribution to UHI effect, that is to say, they are the main contribution factor, on the contrary, green land and waterbody can reduce LST significantly, therefore, rational planning can effectively relieve the UHI effect. 3) This article has achieved 37 profiles from southeast to northwest of basin valley and calculated their land use index values (NDVI、MNDWI、NDBI and NDBaI) and LST, the results show that there existed significant correlation and corresponding relations between LST and the four land use indices.

Key words: basin valley, Urban Heat Island (UHI), spatial-temporal evolution, Lanzhou City

CLC Number:

TP79

Jian-ming ZHANG, Peng-long WANG, Ning MA, Chao ZHANG. Spatial-temporal Evolution of Urban Heat Island Effect in Basin Valley —A Case Study of Lanzhou City[J].SCIENTIA GEOGRAPHICA SINICA, 2012, 32(12): 1530-1537.

Figures/Tables 7

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土地类型	1999年		2010年
土地类型	实际（℃）	正归化	实际（℃）	正归化
建设用地	28.81±2.69	0.53±0.09	30.16±2.02	0.65±0.08
未利用地	26.55±2.32	0.45±0.07	27.97±5.97	0.57±0.23
绿地	24.99±1.79	0.40±0.06	26.48±2.53	0.51±0.10
水体	18.23±3.14	0.16±0.11	18.79±3.13	0.17±0.12

1999年	2010年				1999年合计
1999年	建设用地	未利用地	绿地	水域	1999年合计
建设用地	105.45	4.84	4.22	0.34	114.85
未利用地	5.06	4.57	0.52	0.02	10.17
绿地	35.72	27.42	33.07	0.30	96.51
水域	1.77	0.31	2.39	9.30	13.77
2010年合计	148.00	37.14	40.20	9.96
变化比例/%	28.86	265.19	-58.35	-27.67

土地类型	低温区		次中温区		中温区		次高温区		高温区
土地类型	1999年	2010年	1999年	2010年	1999年	2010年	1999年	2010年	1999年	2010年
建设用地	3.76	1.79	13.18	12.69	61.20	45.46	97.88	79.02	98.69	71.74
未利用地	0.33	0.99	3.11	2.77	5.85	9.96	1.12	15.32	0.79	26.77
绿地	4.21	3.81	79.09	57.21	32.55	44.09	0.93	5.61	0.22	1.32
水域	91.70	93.41	4.62	27.34	0.40	0.49	0.07	0.05	0.30	0.17

Spatial-temporal Evolution of Urban Heat Island Effect in Basin Valley —A Case Study of Lanzhou City

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