尽管美国河流度普遍下降,但损失不断增加
Wei Zhi1,2, Hubert Baniecki3,4, Jiangtao Liu2
1The National Key Laboratory of Water Disaster Prevention, Yangtze Institute for Conservation and Development, Key Laboratory of Hydrologic-Cycle and Hydrodynamic-System of Ministry of Water Resources, College of Hydrology and Water Resources, Hohai University, Nanjing 210024, China.
概括
(P) 污染是一个全球性问题. 深度学习模型显示,大多数美国河流中的P度正在下降,但由于河流排放的增加,总P损失正在增加,这复杂化了缓解努力.
科学领域:
- 环境科学 环境科学
- 水的质量 水的质量
- 数据科学数据科学数据科学
背景情况:
- 从土地到水中的 (P) 损失导致污染,并威胁到粮食安全.
- 由于历史数据有限,分析长期P趋势是很困难的.
研究的目的:
- 使用深度学习重建总 (TP) 的时间趋势.
- 分析整个连续的美国河流中的TP度和流量趋势 (CONUS).
主要方法:
- 利用密集的水文气象数据和多任务长期短期记忆 (LSTM) 深度学习模型.
- 在CONUS的430条河流的数据上训练模型,用于日常TP重建 (1980-2019).
主要成果:
- 重建的每日记录显示,60%的河流中TP度下降.
- 城市河流的TP度下降最多,而农业河流的度增加.
- 尽管度下降,但由于河流排放量的增加,全国范围内每十年的总P损失 (流量) 增加了6.5%.
结论:
- 深度学习有效地重建历史P趋势,解决数据缺口.
- 城市地区有效的P控制与农业非点源污染的挑战形成鲜明对比.
- 由于气候变化导致的河流排放量的增加,大大复杂化了减少整体P损失的努力.
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