1961 至 2018 年珠江流域径流和泥沙排放量的变化及其驱动因素

IF 3.5 2区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES
Jie Tang , Wenting Wang , Hanquan Cheng , Hua Jin , Tian Zhao , Yun Xie
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引用次数: 0

摘要

珠江是中国排水量第二大的河流,由于人类活动和气候变化,珠江发生了显著变化。本研究旨在通过收集水文、气象数据和土地利用数据,探测珠江流域过去 60 年间径流和泥沙排放量的时空变化,并揭示其驱动因素。结果表明,珠江流域的平均泥沙量为 6 470 万方/年,以-760 万方/10 年的速度显著下降。植被覆盖率的增加(0.4%/10 年)和大型水库的存在是导致泥沙量下降趋势的主要因素。然而,在一些水库建设有限的子流域,旱季降雨侵蚀性增加,加上土地用途的转变导致裸露土地和建筑工地迅速增加,导致泥沙量呈上升趋势。珠江口岸的径流量保持相对稳定,变化率为-2.3 km/10 y,其变化与年降雨量和季节降雨量的变化密切相关。人类用水量导致测量的径流量低于自然径流量。两者之间明显的线性关系证实了人类活动的影响。本研究强调了在了解珠江口西岸径流和沉积物动态时考虑自然和人为因素的重要性,并有助于丰富流域水文学知识,指导制定有效的水资源管理战略,促进区域可持续发展。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Changes in runoff and sediment discharge along with their driving factors in the Pearl River basin from 1961 to 2018

The Pearl River is the second-largest river in China in terms of discharge and has experienced significant changes due to human activities and climate change. The aim of the current study was to detect spatiotemporal variations in runoff and sediment discharge in the Pearl River basin (PRB) over the past 60 years and to reveal the driving factors based on the collection of hydrological and meteorological data and land use data. The results showed that the average sediment load in the PRB was 64.7 Mt/y, with a significant decreasing rate of −7.6 Mt/10 y. The increase in vegetation coverage (by 0.4%/10 y) and the presence of large reservoirs were the main factors leading to the decreasing trend in the sediment load. However, in some subbasins with limited reservoir construction, increased rainfall erosivity during the dry season, along with land use conversion leading to a rapid increase in bare land and construction sites, contributed to an upward trend in the sediment load. The runoff discharge in the PRB remained relatively stable, with a change rate of −2.3 km3/10 y, and its variations were closely related to annual and seasonal rainfall changes. Human water consumption resulted in a lower measured runoff than natural runoff levels. A significant linear relation between the two confirmed the impact of human activities. The current study emphasizes the importance of considering both natural and anthropogenic factors in understanding runoff and sediment dynamics in the PRB and contributes to the knowledge of basin hydrology for guiding the formulation of effective water management strategies for sustainable regional development.

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来源期刊
International Journal of Sediment Research
International Journal of Sediment Research 环境科学-环境科学
CiteScore
6.90
自引率
5.60%
发文量
88
审稿时长
74 days
期刊介绍: International Journal of Sediment Research, the Official Journal of The International Research and Training Center on Erosion and Sedimentation and The World Association for Sedimentation and Erosion Research, publishes scientific and technical papers on all aspects of erosion and sedimentation interpreted in its widest sense. The subject matter is to include not only the mechanics of sediment transport and fluvial processes, but also what is related to geography, geomorphology, soil erosion, watershed management, sedimentology, environmental and ecological impacts of sedimentation, social and economical effects of sedimentation and its assessment, etc. Special attention is paid to engineering problems related to sedimentation and erosion.
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