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1985-2018年查干湖时空变化及其对降水变化响应分析*1
方鹤楠, 何真, 陈茜, 夏天
地理过程分析与模拟湖北省重点实验室/华中师范大学城市与环境科学学院
摘要:
【目的】查干湖是吉林省最大的淡水湖泊,其形态和面积的时空格局变化对当地生态环境维护和相关产业发展有着重要意义。本文通过长时间尺度上遥感监测查干湖水体的时空格局变化,分析其变化特征与规律,探讨降雨量对湖体的影响,从而为区域水环境的生态保护与资源合理利用提出针对性建议。【方法】基于查干湖地区1985-2018年共8景的Landsat遥感影像数据,采用NDWI水体指数法对查干湖水体进行识别与提取,通过ArcGIS空间分析功能探究查干湖水体的时空格局变化过程。同时,利用降水数据结合水体面积变化,探讨气候变化对湖水容量的影响。【结果】1985-2018年,查干湖水域空间格局呈波浪形上升变化,水体时空变化区域主要位于辛甸泡、新庙泡和库里泡,查干湖主水体多为边缘性的扩张及缩减;自然降水和“引松入湖”工程是查干湖水体变化的主要因素,引水工程初期对查干湖蓄水量恢复起重要作用,随后水域面积变化慢慢转为受自然降水影响。【结论】近35年来查干湖水域面积受自然降水和引水工程的影响,未来需要进一步保护该地区的生态系统,通过自然降水维持该地区的水域生态平衡,实现查干湖区域产业发展和生态保护的共同发展。
关键词:  遥感监测;时空格局;查干湖;降水量;水域面积
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基金项目:中央高校基本科研业务费(CCNU19TS045)
Spatial-temporal changes of Chagan Lake and its response to precipitation changes in 1985-2018
Fang He-nan, He Zhen, Chen Xi, Xia Tian
College of Urban and Environment Sciences/College of Urban and Environment Sciences,Central China Normal University,Wuhan
Abstract:
[Purpose] Chagan Lake is the largest fresh water lake in Jilin Province. The spatial and temporal pattern of its shape and area is of great significance to the local ecological environment maintenance and the development of related industries. In this paper, based on the long-term remote sensing monitoring of the spatial-temporal pattern change of Chagan Lake, the characteristics and laws of the change are analyzed, and the impact of rainfall on the lake body is discussed, so as to provide targeted suggestions for the ecological protection of regional water environment and the rational utilization of resources.[Method]Based on the Landsat remote sensing image data of 8 scenes from 1985 to 2018 in study area, Chagan Lake was identified and extracted by NDWI water index method. And the spatial and temporal pattern change process of Chagan Lake is explored by ArcGIS spatial analysis function. At the same time, the influence of climate change on lake water capacity is discussed by using precipitation data and water area change. [Result]From 1985 to 2018, the spatial pattern of Chagan Lake water area showed a wave like upward change. The temporal and spatial variation areas of Chagan Lake are mainly located in Xindian, Xinmiao and Kuli Lake. The change of main water body in Chagan Lake is mostly marginal expansion and reduction. Natural precipitation and water diversion project are the main factors of water body change in Chagan Lake. Water diversion project plays an important role in the recovery of water storage capacity of Chagan Lake in the early stage. Subsequently, the change of water area is gradually affected by natural precipitation. [Conclusion]In the past 35 years, the water area of Chagan Lake has been affected by natural precipitation and water diversion projects. In the future, it is necessary to further protect the ecosystem of the area, maintain the ecological balance of the water area through natural precipitation, and realize the common development of Chagan Lake Regional Industry Development and ecological protection.
Key words:  Remote sensing monitoring; spatiotemporal pattern; Chagan Lake; precipitation; water area