Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2019WR026175 |
Tracer-Aided Modeling in the Low-Relief, Wet-Dry Tropics Suggests Water Ages and DOC Export Are Driven by Seasonal Wetlands and Deep Groundwater | |
Birkel, Christian1,2,3; Duvert, Clement4; Correa, Alicia1,2; Munksgaard, Niels C.5; Maher, Damien T.6; Hutley, Lindsay B.4 | |
2020-04-01 | |
发表期刊 | WATER RESOURCES RESEARCH |
ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2020 |
卷号 | 56期号:4 |
文章类型 | Article |
语种 | 英语 |
国家 | Costa Rica; Scotland; Australia |
英文摘要 | Our understanding of how wet-dry tropical catchments process water and solutes remains limited. In this study, we attempt to gain understanding of water and dissolved organic carbon (DOC) transport, storage, and mixing in a 126 km(2) catchment of northern Australia. We developed a coupled, tracer-aided, conceptual rainfall-runoff model (SAVTAM) that simultaneously calculates water, isotope, and DOC-based processes at a daily time step. The semidistributed model can account for the marked hydrological distinction between savanna woodlands and adjacent seasonal wetlands. Using the calibrated model, we tracked the fluxes and derived the age of water in fluxes and storages. Model output matched the seasonal variability, controlled by seasonal rainfall, which switched on and off water and carbon flow pathways from the savanna to seasonal wetlands and ultimately to the perennial river. Such hydrological connectivity is modulated by the karst aquifer system that continuously contributes older waters (decades to century old) to maintain relatively stable and older streamflow during the dry season (average stream water age = 9.7 to 16.2 years). Such older waters occur despite a rapid, monsoon-driven streamflow response. The DOC fluxes were largely sourced from the wetland and riparian forest that transported DOC in the order of 1.9 t C km(-2) year(-1) to the stream, which was on average 90% of the total simulated DOC exports of 2 t C.km(-2).year(-1). We conclude that coupled simulation of water and biogeochemistry is necessary to generate a more complete picture of catchment functioning, particularly in the tropics. Key Points We present the first model to simultaneously and successfully predict flows, isotopic composition, and DOC in a complex tropical catchment Seasonal wetlands contribute on average 90% of total DOC export and extreme events up to 10% per day Deep dolomite aquifer modulates stream water ages |
英文关键词 | wet-dry tropics tracer-aided models water age DOC savanna woodland wetland |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000538987800027 |
WOS关键词 | DISSOLVED ORGANIC-CARBON ; HYDROLOGICAL CONNECTIVITY ; RAINFALL SEASONALITY ; NORTHERN AUSTRALIA ; CLIMATE-CHANGE ; FLUX TRACKING ; RIPARIAN ZONE ; SOIL-WATER ; DYNAMICS ; RUNOFF |
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/280647 |
专题 | 资源环境科学 |
作者单位 | 1.Univ Costa Rica, Dept Geog, San Jose, Costa Rica; 2.Univ Costa Rica, Water & Global Change Observ, San Jose, Costa Rica; 3.Univ Aberdeen, Northern Rivers Inst, Aberdeen, Scotland; 4.Charles Darwin Univ, Res Inst Environm & Livelihoods, Darwin, NT, Australia; 5.James Cook Univ, Coll Sci Technol & Engn, Cairns, Qld, Australia; 6.Southern Cross Univ, Southern Cross Geosci, Lismore, NSW, Australia |
推荐引用方式 GB/T 7714 | Birkel, Christian,Duvert, Clement,Correa, Alicia,et al. Tracer-Aided Modeling in the Low-Relief, Wet-Dry Tropics Suggests Water Ages and DOC Export Are Driven by Seasonal Wetlands and Deep Groundwater[J]. WATER RESOURCES RESEARCH,2020,56(4). |
APA | Birkel, Christian,Duvert, Clement,Correa, Alicia,Munksgaard, Niels C.,Maher, Damien T.,&Hutley, Lindsay B..(2020).Tracer-Aided Modeling in the Low-Relief, Wet-Dry Tropics Suggests Water Ages and DOC Export Are Driven by Seasonal Wetlands and Deep Groundwater.WATER RESOURCES RESEARCH,56(4). |
MLA | Birkel, Christian,et al."Tracer-Aided Modeling in the Low-Relief, Wet-Dry Tropics Suggests Water Ages and DOC Export Are Driven by Seasonal Wetlands and Deep Groundwater".WATER RESOURCES RESEARCH 56.4(2020). |
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