城市地表覆被类型变化及城市热岛效应研究
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摘要
本研究利用Landsat5卫星影像反演了嘉兴、湖州、绍兴地区1994年和2010年的不透水面、植被、水体、地面温度等主要地表参数,并对其空间分布格局进行深入分析,试图揭示16年间这三个城市土地利用和地表温度变化的动态特征,从而为杭州都市经济圈的城市规划和产业布局等研究提供相关依据和借鉴。研究发现:
     (1)就2010年研究区现状来看,嘉兴市和绍兴市的地表覆被类型组成比重较为一致,不透水面:植被:水体=3:6:1,湖州市为2:6:2;湖州市各地表覆被景观分布格局最好,为1.73,嘉兴其次,为0.95,绍兴最差,为0.75;嘉兴市热岛面积比例最低,为6.15%,绍兴市与湖州市相差不大,分别为12.08%和12.26%。
     (2)就2010年主城区现状来看,嘉兴市的面积最大,为72.36km~2,绍兴市其次,为53.64km~2,湖州市最小,为35.64km~2;湖州市主城区各地表覆被景观分布格局最好,为-1.46,绍兴最差,为-1.9;嘉兴市主城区热岛面积比例最低,为29.53%,绍兴市其次,为46.81%,湖州市最高,为78.31%。
     (3)就研究区16年间变化来看,嘉兴市不透水面面积增加最快,增长2.26倍,湖州市和绍兴市相差不大,分别增长1.55倍和1.22倍;除了绍兴市因大规模竭泽造田使植被面积提高了1.43倍外,嘉兴和湖州植被面积均有不同程度的下降;3个城市研究区地表覆被景观分布格局均处于恶化趋势,其中,嘉兴市恶化程度最高,为-1.65,湖州市恶化程度最低,为-1.24;嘉兴市研究区热岛面积所占比重增加了4.6%,是原先的3.97倍;湖州市热岛面积比重增加了8.29%,是原先的3.08倍;绍兴市热岛面积比重增加了7.99%,是原先的3.08倍。
     (4)就主城区16年间变化来看,嘉兴市主城区面积提高了5.58倍,湖州市提高了3倍,绍兴市提高了2.4倍;3个城市主城区范围内地表覆被景观分布格局均处于改善状态,其中,嘉兴市改善程度最高,为0.75,绍兴市改善程度最低,为0.14;16年间嘉兴市主城区热岛面积比重降低了26.83%,是原先的0.52倍;绍兴市热岛面积比重降低了10.54%,是原先的0.82倍;湖州市热岛面积比重增加了6.71%,是原先的1.09倍。
The dynamics of urban biophysical descriptors, represented mainly by impervious surface,vegetation and open water, can affect the quality of urban thermal environment (UTE). The studyfocuses on the quantitative relationship between impervious surface and land surface temperature(LST) because the impervious surface has for many years been recognized as an indicator of theintensity of the UTE and, with the advent of urban sprawl, become a key issue in urban habitathealth. The city’s biophysical properties of Jiaxing, Shaoxing and Huzhou, e. g., impervioussurface, vegetation and water, along with LST in1994and2009were retrieved from the LandsatTM images of the corresponding years. We want to reveal the dynamic character of land use andLST of these three cities, which could provided reference for city planning policies anddistribution of the Hangzhou Economic Circle.
     (1) On present situation of the study area in2010, the various components of the proportionof land cover type of Jiaxing was nearly consistent with Shaoxing, the ratio of impervious surfaceto vegetation and water was3:6:1, which was2:6:2in Huzhou. Huzhou had the best landscapepattern of all. The area ratio of urban heat island (UHI) in Jiaxing was very low (about6.15%),which had little difference in Shaoxing and Huzhou, the ratio was12.08%and12.26%respectively.
     (2) On present situation of the urban area in2010, the urban area of Jiaxing was72.36km~2,which was the biggest of all. Huzhou had the best landscape pattern of all. The area ratio of urbanheat island (UHI) in Jiaxing was very low (about29.53%), which was46.81%and78.31%respectively in Shaoxing and Huzhou,
     (3) On the variance in study area during16years, the impervious surface area of Jiaxing grewfastest,2.26times than before, which had little difference in Shaoxing and Huzhou. Thevegetation area of Shaoxing increased in Shaoxing, which was decreased in Jiaxing and Huzhou.The landscape pattern of study area of all the three city was getting worse, which was worst inJiaxing. The area ratio of UHI in Jiaxing increased4.6%,3.97times than before.
     (4) On the variance in urban area during16years, the urban area of Jiaxing grew fastest, which was5.58times than before. The landscape pattern of urban area of all the three city wasgetting better, which was best in Jiaxing. The area ratio of UHI in Jiaxing decreased26.83%,0.52times than before.
引文
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