Extreme storm events shift DOC export from transport-limited to source-limited in a typical flash flood catchment

被引：7

作者：

Su, Hang ^{[1
,2
,3
]}

Cheng, Lei ^{[1
,2
,3
]}

Wu, Yue ^{[1
,2
,3
]}

Qin, Shujing ^{[1
,2
,3
]}

Liu, Pan ^{[1
,2
,3
]}

Zhang, Quan ^{[1
,2
,3
]}

Cheng, Hujie ^{[1
,2
,3
]}

Li, Yuran ^{[1
,2
,3
]}

机构：

[1] Wuhan Univ, State Key Lab Water Resources & Hydropower Engn Sc, Wuhan 430072, Peoples R China

[2] Hubei Prov Collaborat Innovat Ctr Water Resources, Wuhan 430072, Peoples R China

[3] Wuhan Univ, Hubei Prov Key Lab Water Syst Sci Sponge City Cons, Wuhan 430072, Peoples R China

来源：

JOURNAL OF HYDROLOGY | 2023年 / 620卷

基金：

中国国家自然科学基金;

关键词：

Dissolved organic carbon; Storm event; Flash flood catchment; Transport limitation; Source limitation; DISSOLVED ORGANIC-CARBON; DISCHARGE; HYSTERESIS; RIVER; LAND; FLUX; PERSPECTIVES; SEDIMENT; NUTRIENT; SNOWMELT;

D O I：

10.1016/j.jhydrol.2023.129377

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

Dissolved organic carbon (DOC) export regimes are co-determined by DOC source supply and hydrological transport. Field studies have indicated that catchment DOC export is a single regime (source- or transportlimited, or chemostatic). If a shift between DOC export regimes exists, as has been rarely reported before based on low-frequency observation, then conceptual paradigms regarding lateral carbon export need to be revised. DOC dynamics of a flash flood catchment were investigated in this study with high-frequency observations during flood seasons. A three-phase DOC concentration and discharge relationship (n = 713) was observed, i.e., slow increase, rapid increase, and flat phases that occurred during the inter-storm, moderate storm, and extreme storm periods, respectively. Further hysteresis analysis showed that the anticlockwise pattern observed during moderate storms shifted to a clockwise pattern during extreme storms. These transitions suggest that extreme storm events shifted DOC export from transport-limited to source-limited. Failure to consider such a shift can cause significant overestimation of DOC yield in flash flood catchments where DOC yield is largely driven by storms.

引用

页数：10