摘要: |
【目的】水资源变化对区域发展有着深远影响,其空间消长能体现自然环境因素和社会经济活动的综合作用。【方法】为了在大范围区域尺度上深入探究南京市水体空间变化轨迹及其成因,选取成像于多个年份同一季度的Landsat影像为主要信息源,依据水体信息遥感提取结果,采用空间变化强度指数和区域重心模型等,对南京市水体面积的时空变化特征进行分析,在此基础上,基于多因子回归分析法,结合高分辨率影像验证,对南京市不同时期的水域变化主影响因素进行识别分析。【结果】研究结果表明:南京市在1990-2018年间的水域分布重心持续南移,水体面积总体上呈扩大发展态势,但在此期间,由于气候变化、城市用地扩张和水产养殖业发展等因素的影响,使得南京市的水域面积表现出阶段性时增时减的波动特征,尤其是1994年因为降水严重偏少等引发的干旱,导致当年该市的水域面积降到了近30年来的最低水平;此后,在包括溧水和高淳两县在内的南京市以南地区,由于水产养殖规模的扩大,越来越多的农田被开挖成鱼塘,这是南京市水域分布重心不断向南移动的主要原因。 |
关键词: 水体 遥感 时空变化 影响因素 南京市 |
DOI: |
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基金项目:湖北省技术创新重大项目(2018ABA078) |
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Analysis on the change of water distribution pattern and its influence factors in Nanjing City during 1990-2018 |
Yang Yuqi, Wang Quanfang, Chen Longyue
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School of Resources and Environmental Science,Hubei University
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Abstract: |
[Purpose] Water is an important ecological resource, and its changes have a profound impact on urban development.[Method] In order to deeply explore the spatial trajectory of water in Nanjing City and its genesis on a large scale, Landsat images in the same quarter of multiple years are selected as the main information source. Based on the remote sensing extraction of water information, the spatial intensity index and regional center of gravity are adopted in analysis on the spatial and temporal variation characteristics of water area in Nanjing. Based on this, multi-factor regression analysis and high-resolution image verification were applied to identify the influencing factors of water changes in Nanjing.[Result] The results show that the water area in Nanjing City during the period of 1990-2018 has expanded and been at a relationally stable but up-and-down trend with influences from climate change, urban expansion and aquaculture development, Especially due to severe drought caused by severe precipitation in 1994, the city"s water area decreased to the lowest level in nearly 30 years; thereafter, with the large-scale aquaculture’s advance in two counties of Lishui and Gaochun in the south Nanjing City, a lot of farmland has been transformed into fish ponds, which therefore caused the gravity center of water distribution in Nanjing to move southward. |
Key words: Water remote sensing Spatial-temporal change influence factor Nanjing City of China |