Mobilization and Export of Particulate and Dissolved Solids and Organic Carbon From Contrasting Mountainous River Watersheds in California and Oregon
Mobilization and Export of Particulate and Dissolved Solids and Organic Carbon From Contrasting Mountainous River Watersheds in California and Oregon
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DOI：
10.1029/2022jg007084
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发表时间：
2023-03
期刊：
影响因子：
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通讯作者：
M. Goñi;Kylie A. Welch;Layla Ghazi;J. Pett‐Ridge;B. Haley
中科院分区：
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作者：
M. Goñi;Kylie A. Welch;Layla Ghazi;J. Pett‐Ridge;B. Haley
研究了北方加州和中部俄勒冈州（USA）两条具有明显流域特征的山区河流（Eel河和Umpqua河）的支流和干流中总悬浮固体（TSS）、总溶解固体（TDS）、颗粒有机碳（POC）和溶解有机碳（DOC）的浓度-流量（C-Q）关系。对数据的幂律（C = a × Q B）拟合显示TSS和POC的强传输限制行为（B > 1），DOC的中等传输限制（B > 0.3）和高流量条件下的化学稳定行为（B> 90%）。TSS的有机碳含量显示出显着的减少与放电，而在TDS在高流量条件下增加。使用C-Q关系计算了不同沿海河流的每日和累积物质通量，结果表明，运输限制成分的输送，如TSS和POC（以及较小程度的DOC），与高排放事件密切相关，主要发生在冬季。冬季通量与沿海沿着高波浪南风条件之间的一致性突出了河流排放模式的季节性和年际差异如何影响输送到沿海地区的陆源物质的命运。
Concentration‐discharge (C‐Q) relationships of total suspended solids (TSS), total dissolved solids (TDS), particulate organic carbon (POC), and dissolved organic carbon (DOC) were investigated in the tributaries and main‐stems of two mountainous river systems with distinct watershed characteristics (Eel and Umpqua rivers) in Northern California and central Oregon (USA). Power‐law (C = a × Qb) fits to the data showed strong transport‐limited behavior (b > 1) by TSS and POC, moderate transport limitation of DOC (b > 0.3) and chemostatic behavior (b 90%) at high‐flow conditions. Organic carbon contents of TSS displayed marked decreases with discharge whereas they increased in TDS during high‐flow conditions. Daily and cumulative material fluxes for different coastal streams were calculated using the C‐Q relationships and showed that the delivery of transport‐limited constituents, such as TSS and POC (and DOC to a lesser degree), was closely tied to high‐discharge events and occurred primarily during the winter season. The coherence between winter fluxes and high wave‐southerly wind conditions along the coast highlights how seasonal and inter‐annual differences in fluvial discharge patterns affect the fate of land‐derived materials delivered to coastal regions.