Natural and anthropogenic forces on suspended sediment dynamics in Asian estuaries
Natural and anthropogenic forces on suspended sediment dynamics in Asian estuaries
复制标题
自然和人为力量对亚洲河口悬浮沉积物动力学的影响
DOI：
10.1016/j.scitotenv.2022.155569
复制
发表时间：
2022
影响因子：
9.8
通讯作者：
Hijioka Yasuaki
中科院分区：
文献类型：
--
作者：
Yunus Ali P.;Masago Yoshifumi;Boulange Julien;Hijioka Yasuaki
气候变化和人类活动正在影响河流的水文条件，并可能改变了排入沿海海洋的营养物质和悬浮沉积物。然而，测试这一假设是困难的，由于缺乏观测数据和全球公认的悬浮泥沙浓度（SSC）算法的不可用混淆。在这里，我们分析了在SSC（2000 - 2020年）的趋势，在10个主要的亚洲河流的河口，使用10个可用的卫星SSC算法。我们确定了空间上不同的趋势，SSC在黄河，珍珠河和印度河的河口减少，在Narmada河和恒河-雅鲁藏布江河口增加的趋势，而在其余河流的河口没有显着的趋势。河流流量，水坝，流域土地利用的变化单独没有足够的，但复制观察到的SSC趋势时，一起使用。我们的研究结果表明，人类活动威胁的海洋生态系统比气候强迫亚洲海岸。
Climate change and anthropogenic activities are affecting the hydrological conditions of rivers and may have altered nutrient and suspended sediments released into coastal seas. However, testing this hypothesis is difficult, confounded by the lack of observational data and the unavailability of globally accepted suspended sediment concentration (SSC) algorithms. Here, we analyzed the trends in SSC (2000–2020) at the mouths of 10 major Asian rivers using 10 available satellite-SSC algorithms. We identified spatially distinct trends, with SSC decreasing at the mouths of the Yellow, Pearl, and Indus rivers, and increasing trends at the mouths of the Narmada and Ganges-Brahmaputra rivers, while there were no significant trends at the mouths of the remaining rivers. River discharge, dams, and land use changes in basins individually did not suffice, but reproduced the observed SSC trends when used together. Our results imply that anthropogenic activities threaten the marine ecosystem more than climate forcing on Asian coasts.