Paleodrainage network in the Xiong’an New Area: Remote sensing-based reconstruction and relationship with town planning
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摘要: 雄安新区是具有全国意义的新区,其地下水位埋深较浅,包气带和饱水带之间水分交换十分密切,地下水的向上补给增大了土壤中水分含量。据此,该文以遥感影像为数据源,首先对研究区进行面向对象的土地分类,掩模提取植被信息,从而对植被区域利用温度植被干旱指数(temperature vegetation dryness index,TVDI)提取土壤水分信息,结合该区域古河道地质地貌特征和目视解译,识别了研究区内的古河道,并进行野外实地验证,对雄安新区古水系进行重构。结果表明: 该方法可以有效地提取研究区古水系信息; 研究区现今地表水体分布与古水系分布具有较大差异; 比较土地分类结果与古水系解译结果发现,古水系分布区域多集中在现今的建筑用地,这些建筑用地在遥感影像上表现为农村居民点。以古水系区域分别设置50 m,100 m,200 m缓冲区,并与土地分类结果进行相交分析。结果表明,在缓冲区域内的建筑用地占地面积占比相较全区域建筑用地占地面积占比明显增加,表明古水系分布与村落存在一定的相关性。Abstract: Xiong’an New Area is a national new area. It has a low groundwater level and close water exchange between the zone of aeration and the saturated zone, with the upward recharge of groundwater increasing the water content in soil. On this basis, with remote sensing images as the data source, this study carried out object-oriented land classification for the study area, extracted the vegetation information by mask, and further extracted the soil moisture information of the vegetation area using the temperature vegetation dryness index (TVDI). Then, by combining the geological and geomorphic characteristics of the palaeochannels in the area, as well as visual interpretation, this study identified the palaeochannels in the study area and verified them in the field. Finally, it reconstructed the paleodrainage system of the study area. The results are as follows: ① The method proposed in this study can effectively extract information on the paleodrainage system in the study area; ② The distribution of the current surface water bodies in the study area is quite different from that of the paleodrainage system; ③ The comparison between the land classification results and the paleodrainage system interpretation results shows that the paleodrainage system was mostly distributed in present construction land, which is present as rural residential areas in remote sensing images. 50 m, 100 m, and 200 m buffer zones were set in the paleodrainage system areas, and then a intersection analysis was made for the buffer zones and the land classification results. The results show that the proportion of construction land in the buffer zones is significantly higher than that of construction land in the whole region. This result indicates that there exists a certain correlation between the distribution of the paleodrainage system and villages.
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Key words:
- remote sensing /
- Xiong’an New Area /
- paleodrainage system /
- TVDI
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