[口头报告]Regime shift of a large river as a response to Holocene climate change depends on land use – a numerical case study from the Chinese Loess Plateau

Regime shift of a large river as a response to Holocene climate change depends on land use – a numerical case study from the Chinese Loess Plateau
编号:2473 稿件编号:2772 访问权限:私有 更新:2023-04-11 19:22:47 浏览:173次 口头报告

报告开始:2023年05月07日 14:38 (Asia/Shanghai)

报告时间:10min

所在会议:[12] 12、地表过程与地貌 » [12-3] 12-3 地表过程与地貌

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摘要
The Wei River catchment in the southern part of the Chinese Loess Plateau (CLP), is one of the centers of the agricultural revolution in China. The area has experienced intense land use changes since ~6000 BCE, which makes it an ideal place to study the response of fluvial systems to anthropogenic land cover change (ALCC). We applied a numerical landscape evolution model that combines the Landlab landscape evolution model with an evapotranspiration model to investigate the direct and indirect effects of ALCC on hydrological and morphological processes in the Wei River catchment since the mid-Holocene. The results show that ALCC not only leads to changes in discharge and sediment load in the catchment but also affects their sensitivity to climate change. When the proportion of agricultural land area exceeded 50% (around 1000 BCE), the sensitivities of discharge and sediment yield to climate change increased abruptly indicating a regime change in the fluvial catchment. It is associated with a large sediment pulse in the lower reaches. The model simulation results also show a link between human settlement, ALCC and floodplain development: Changes in agricultural land use changes lead to downstream sediment accumulation and floodplain development, which in turn leads to further spatial expansion of agriculture and human settlement.
关键字
fluvial regime shift,Anthropogenic land cover change,fluvial climate sensitivity,climate change,Chinese Loess Plateau,central China
报告人
陈浩
南京大学

稿件作者
陈浩 南京大学
王先彦 南京大学
于严严 中国科学院地质与地球物理研究所
鹿化煜 南京大学
Van BalenRonald Department of Earth Sciences, VU University Amsterdam
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徐 鹏(13554674258;xupengwhu@whu.edu.cn)
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