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来自K490的印度半岛河口的度动态揭示了关键的人为驱动因素

Sravanthi Nukapothula¹, Ali P Yunus², Sahil Kaushal²

¹Centre for Earth, Ocean and Atmospheric Sciences, University of Hyderabad, Hyderabad, 500046, India; State Key Laboratory of Tropical Oceanography, Guangdong Key Lab of Ocean Remote Sensing, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, 510301, China.

The Science of the total environment

|June 28, 2023

概括

尽管降雨量增加,但印度主要河流的沉积物负载正在下降,以较低的度 (Kd490) 表示. 这表明土地利用变化和水,而不是气候,正在改变河流物质运输到沿海海洋.

科学领域:

环境科学环境科学
水文学的水文学
海洋学海洋学海洋学

背景情况:

大型河流对于将陆地物质运输到沿海海洋至关重要.
气候变暖和人类活动正在改变河流系统.
河流排水和下水的变化对沿海环境产生影响.

研究的目的:

量化分析沿海河口度的变化.
调查影响印度河流沉积物负载的因素.
评估气候和人为因素对河流度的影响.

主要方法:

用490nm的扩散衰减系数 (Kd490) 作为度代理.
从中等分辨率成像光谱仪 (MODIS) 图像中分析了时间序列数据 (2000-2022年).
对比印度半岛六条主要河流的度趋势与降雨数据.

主要成果:

纳尔玛达河,塔普蒂河,卡韦里河,克里什纳河,戈达瓦里河和玛哈纳迪河的Kd490值有明显的下降趋势.
度的下降发生在研究盆地的降雨趋势不断增加的情况下.
这些发现表明,到达这些河流的沿海河口的沉积物负载减少了.

结论:

土地利用变化和增加的水建设可能是降低沉积物负载的主要驱动因素.
这些因素超过了由于降雨量增加而导致沉积物运输的预期增加.
改变河流沉积物输送影响沿海过程和生态系统.

关键词:

人类世 (Anthropocene) 是一个人类世.扩散衰减系数的扩散衰减系数印度的半岛河流.河流排放的排放情况度度度度水的透明度水的透明度

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