DOI: 10.5194/hess-22-6435-2018
论文题名: Using modelled discharge to develop satellite-based river gauging: A case study for the Amazon Basin
作者: Hou J. ; Van Dijk A.I.J.M. ; Renzullo L.J. ; Vertessy R.A.
刊名: Hydrology and Earth System Sciences
ISSN: 1027-5606
出版年: 2018
卷: 22, 期: 12 起始页码: 6435
结束页码: 6448
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
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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163109
Appears in Collections: 气候变化与战略
There are no files associated with this item.
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
Recommended Citation:
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]. Hydrology and Earth System Sciences,2018-01-01,22(12)