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DOI	10.5194/hess-22-6435-2018
	Using modelled discharge to develop satellite-based river gauging: A case study for the Amazon Basin
	Hou J.; Van Dijk A.I.J.M.; Renzullo L.J.; Vertessy R.A.
发表日期	2018
ISSN	1027-5606
起始页码	6435
结束页码	6448
卷号	22 期号:12
英文摘要	River discharge measurements have proven invaluable to monitor the global water cycle, assess flood risk, and guide water resource management. However, there is a delay, and ongoing decline, in the availability of gauging data and stations are highly unevenly distributed globally. While not a substitute for river discharge measurement, remote sensing is a cost-effective technology to acquire information on river dynamics in situations where ground-based measurements are unavailable. The general approach has been to relate satellite observation to discharge measured in situ, which prevents its use for ungauged rivers. Alternatively, hydrological models are now available that can be used to estimate river discharge globally. While subject to greater errors and biases than measurements, model estimates of river discharge do expand the options for applying satellite-based discharge monitoring in ungauged rivers. Our aim was to test whether satellite gauging reaches (SGRs), similar to virtual stations in satellite altimetry, can be constructed based on Moderate Resolution Imaging Spectroradiometer (MODIS) optical or Global Flood Detection System (GFDS) passive microwave-derived surface water extent fraction and simulated discharge from the World-Wide Water (W3) model version 2. We designed and tested two methods to develop SGRs across the Amazon Basin and found that the optimal grid cell selection method performed best for relating MODIS and GFDS water extent to simulated discharge. The number of potential river reaches to develop SGRs increases from upstream to downstream reaches as rivers widen. MODIS SGRs are feasible for more river reaches than GFDS SGRs due to its higher spatial resolution. However, where they could be constructed, GFDS SGRs predicted discharge more accurately as observations were less affected by cloud and vegetation. We conclude that SGRs are suitable for automated large-scale application and offer a possibility to predict river discharge variations from satellite observations alone, for both gauged and ungauged rivers.. © 2018 Copernicus. All rights reserved.
语种	英语
scopus关键词	Cost effectiveness; Discharge (fluid mechanics); Floods; Patient monitoring; Radiometers; Remote sensing; Risk assessment; Satellites; Water management; Cost-effective technology; Ground based measurement; Large-scale applications; Moderate resolution imaging spectroradiometer; River discharge measurements; Satellite observations; Simulated discharges; Waterresource management; Rivers; gauge; global perspective; hydrological modeling; MODIS; remote sensing; river discharge; satellite altimetry; spatial resolution; surface water; Amazon Basin
来源期刊	Hydrology and Earth System Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/159826
作者单位	Hou, J., Fenner School of Environment and Society, Australian National University, Canberra, Australian Capital Territory, Australia; Van Dijk, A.I.J.M., Fenner School of Environment and Society, Australian National University, Canberra, Australian Capital Territory, Australia; Renzullo, L.J., Fenner School of Environment and Society, Australian National University, Canberra, Australian Capital Territory, Australia; Vertessy, R.A., Fenner School of Environment and Society, Australian National University, Canberra, Australian Capital Territory, Australia, School of Engineering, University of Melbourne, Melbourne, VIC, Australia
推荐引用方式 GB/T 7714	Hou J.,Van Dijk A.I.J.M.,Renzullo L.J.,et al. Using modelled discharge to develop satellite-based river gauging: A case study for the Amazon Basin[J],2018,22(12).
APA	Hou J.,Van Dijk A.I.J.M.,Renzullo L.J.,&Vertessy R.A..(2018).Using modelled discharge to develop satellite-based river gauging: A case study for the Amazon Basin.Hydrology and Earth System Sciences,22(12).
MLA	Hou J.,et al."Using modelled discharge to develop satellite-based river gauging: A case study for the Amazon Basin".Hydrology and Earth System Sciences 22.12(2018).