UsingInSARto identify hydrological connectivity and barriers in a highly fragmented wetland

文献类型： 外文期刊

第一作者： Liu, Dan

作者： Liu, Dan;Wang, Xuan;Yang, Wei;Cui, Baoshan;Yan, Shengjun;Zhang, Yunlong;Liu, Dan;Wang, Xuan;Yan, Shengjun;Zhang, Yunlong;Aminjafari, Saeid;Jaramillo, Fernando;Zhu, Jie;Jaramillo, Fernando

作者机构：

关键词： coherence; fragmented wetland; fringes; hydrological barriers; hydrological connectivity; InSAR

期刊名称：HYDROLOGICAL PROCESSES （ 影响因子：3.565； 五年影响因子：4.129 ）

ISSN： 0885-6087

年卷期： 2020 年 34 卷 23 期

页码：

收录情况： SCI

摘要： Hydrological connectivity is a critical determinant of wetland functions and health, especially in wetlands that have been heavily fragmented and regulated by human activities. However, investigating hydrological connectivity in these wetlands is challenging due to the costs of high-resolution and large-scale monitoring required in order to identify hydrological barriers within the wetlands. To overcome this challenge, we here propose an interferometric synthetic aperture radar (InSAR)-based methodology to map hydrologic connectivity and identify hydrological barriers in fragmented wetlands. This methodology was applied along 70 transects across the Baiyangdian, the largest freshwater wetland in northern China, using Sentinel 1A and 1B data, covering the period 2016-2019. We generated 58 interferograms providing information on relative water level changes across the transects that showed the high coherence needed for the assessment of hydrological connectivity. We mapped the permanent and conditional (temporary) barriers affecting connectivity. In total, 11% of all transects are permanently disconnected by hydrological barriers across all interferograms and 58% of the transects are conditionally disconnected. Areas covered by reed grasslands show the most undisturbed hydrological connectivity while some of these barriers are the result of ditches and channels within the wetland and low water levels during different periods of the year. This study highlights the potential of the application of Wetland InSAR to determine hydrological connectivity and location of hydrological barriers in highly fragmented wetlands, and facilitates the study of hydrological processes from large spatial scales and long-time scales using remote sensing technique.

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