Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2016WR018935 |
Understanding watershed hydrogeochemistry: 2. Synchronized hydrological and geochemical processes drive stream chemostatic behavior | |
Li, Li1; Bao, Chen2; Sullivan, Pamela L.3,4,5; Brantley, Susan3,4; Shi, Yuning6; Duffy, Christopher1 | |
2017-03-01 | |
发表期刊 | WATER RESOURCES RESEARCH |
ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2017 |
卷号 | 53期号:3 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Why do solute concentrations in streams remain largely constant while discharge varies by orders of magnitude? We used a new hydrological land surface and reactive transport code, RT-Flux-PIHM, to understand this long-standing puzzle. We focus on the nonreactive chloride (Cl) and reactive magnesium (Mg) in the Susquehanna Shale Hills Critical Zone Observatory (SSHCZO). Simulation results show that stream discharge comes from surface runoff (Q(s)), soil lateral flow (Q(L)), and deeper groundwater (Q(G)), with Q(L) contributing >70%. In the summer, when high evapotranspiration dries up and disconnects most of the watershed from the stream, Cl is trapped along planar hillslopes. Successive rainfalls connect the watershed and mobilize trapped Cl, which counteracts dilution effects brought about by high water storage (V-w) and maintains chemostasis. Similarly, the synchronous response of clay dissolution rates (Mg source) to hydrological conditions, maintained largely by a relatively constant ratio between wetted mineral surface area A(w) and V-w, controls Mg chemostatic behavior. Sensitivity analysis indicates that cation exchange plays a secondary role in determining chemostasis compared to clay dissolution, although it does store an order-of-magnitude more Mg on exchange sites than soil water. Model simulations indicate that dilution (concentration decrease with increasing discharge) occurs only when mass influxes from soil lateral flow are negligible (e.g., via having low clay surface area) so that stream discharge is dominated by relatively constant mass fluxes from deep groundwater that are unresponsive to surface hydrological conditions. |
英文关键词 | watershed hydrogeochemistry reactive transport concentration-discharge relationship |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000400160500034 |
WOS关键词 | CONCENTRATION-DISCHARGE RELATIONSHIPS ; SHALE HILLS CATCHMENT ; GOODNESS-OF-FIT ; DISSOLUTION KINETICS ; SPATIAL VARIABILITY ; CO2 CONSUMPTION ; DOUBLE PARADOX ; POROUS-MEDIA ; TRANSPORT ; MODEL |
WOS类目 | Environmental Sciences ; Limnology ; Water Resources |
WOS研究方向 | Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/22091 |
专题 | 资源环境科学 |
作者单位 | 1.Penn State Univ, Dept Civil & Environm Engn, University Pk, PA 16802 USA; 2.Penn State Univ, John & Willie Leone Dept Energy & Mineral Engn, University Pk, PA 16802 USA; 3.Penn State Univ, Earth & Environm Syst Inst, University Pk, PA 16802 USA; 4.Penn State Univ, Dept Geosci, University Pk, PA 16802 USA; 5.Univ Kansas, Dept Geog, Lawrence, KS 66045 USA; 6.Penn State Univ, Dept Ecosyst Sci & Management, University Pk, PA 16802 USA |
推荐引用方式 GB/T 7714 | Li, Li,Bao, Chen,Sullivan, Pamela L.,et al. Understanding watershed hydrogeochemistry: 2. Synchronized hydrological and geochemical processes drive stream chemostatic behavior[J]. WATER RESOURCES RESEARCH,2017,53(3). |
APA | Li, Li,Bao, Chen,Sullivan, Pamela L.,Brantley, Susan,Shi, Yuning,&Duffy, Christopher.(2017).Understanding watershed hydrogeochemistry: 2. Synchronized hydrological and geochemical processes drive stream chemostatic behavior.WATER RESOURCES RESEARCH,53(3). |
MLA | Li, Li,et al."Understanding watershed hydrogeochemistry: 2. Synchronized hydrological and geochemical processes drive stream chemostatic behavior".WATER RESOURCES RESEARCH 53.3(2017). |
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