摘要
Fresh water is arguably the most vital resource for many aspects of a healthy and stable environment.Monitoring the extent of surface water enables resource managers to detect perturbations and long term trends in water availability,and set consumption guidelines accordingly.Potential end-users of water-related observations are numerous and reflect society as a whole.They encompass scientists and managers at all levels of government,aboriginal groups,water/power utility managers,farmers,planners,engineers,hydrologists,medical researchers,climate scientists,recreation enthusiasts,public school to postgraduate students,many special interest groups and the general public.Water data and analyses generate information products that benefit water resources planning and management,engineering design,plant operations,navigation activities,health research,water quality assessments and ecosystem management.As well,they serve as inputs for flood and drought warnings and weather and climate prediction models.Radar data in general,and RADARSAT in particular,are very good for detecting open surface water and have been used operationally for flood monitoring in many countries.Significant radar data archives now exist to analyse seasonal,annual and decadal trends,in order to attain a better understanding of the freshwater cycle.Radar data are also useful for wetland classification and soil moisture estimation.With the increasing pressure on water resources,both from a quality as well as a quantity perspective,the need will continue to increase for reliable information.RADARSAT-2 has several innovations that will enhance the ability to provide useful information about water resources.This paper provides an overview of the use of radar in general,and RADARSAT-2 in particular,for the generation of information products useful to water resource managers.
