Science Service System

Summary of Proposal HYD2457

TitlePotential of Wide ScanSAR and Staring Spotlight modes for water resources monitoring and biodiversity maintain
Investigator YESOU, Hervé - SERTIT - UDS, N/A
Team Members
Pr HUANG, Shifeng - China Institute of Water Resource and Hydropower Research (IWHR), N/A
Dr YESOU, Hervé - SERTIT - UDS, N/A
Pr LAI, Xijun - Nanjing Institute of Geography & Limnology, Chinese Academy of Sciences (NIGLAS), N/A
Mrs DAILLET-ROCHETTE , Sylviane - LEGOS/CNES, N/A
Dr CAO, Lei - Chinese Academy of Sciences Research Center for Eco-Environmental Sciences, N/A
Mr BURNHAM, James - International Crane Foundation, N/A
Mr PHILIPPOTEAUX, Laurent - Service de Prévention des Crues, DREAL Alsace, Mission Risques Naturels, PHRN
SummaryThe purpose is to complete the work realized on the assessmentof sensors/missions (ALOS, Pleiades, Cosmo-SkyMed, TanDEM-X, simulated Sentinel2through TakeFive initiative, future SWOT) for water bodies recognition andmonitoring. Over Poyang lake, such works have been done in parallel/associationwith the long term monitoring launched in 2004 within the DRAGON ESA MOSTprojects.Water monitoring in generalconstitutes the angular stone of these projects, but more specific study fieldsrelated to water monitoring can be defined: water extent, height and qualityassessment, wetland ecosystem understanding, epidemiology, regional interactionand global context. The work will focus on the middle and lower Yangtze Riverreaches, since several hundred millions of inhabitants live downstream of ThreeGorges dam and depend directly on the natural services that wetlands are ableto provide. Regulating or provisioning services such as respectively floodstorage or fishing for example, are crucial benefits offered by the YangtzeRiver and the numerous lakes along its course. In addition of the Poyang andDongting lakes that have been monitored from the beginning of the first DRAGONproject, the study has been extended to smaller lakes located downstream in theAnhui Province. By comparison of this rich database and search historyof Poyang lake area, the Alsatian Plain flood is also a key area for EO datapotential assessment, both optical (from SPOT series to Pleiades) and SAR. As regards water monitoring, the trends of change inPoyang and Dongting lakes are observed over more than ten years whereas for thesmall lakes in the Anhui Province thechanges are much more rapid, occurring within only a few years. Up to now thesesmall lakes, disconnected by sluices from the Yangtze River flow, have beenpoorly investigated even if these have also a very important role in terms ofpublic health management and to maintain biodiversity. For these reasons it isvery important to be able to realize synchronous observation over the entireregion, and the Wide ScanSAR mode is appearing as a very good tool, with a goodcompromise in term of spatial resolution, revisiting time and swath/coverage. ForPoyang Lakes, Wide ScanSAR mode data will be exploited as already indicated inorder to get a synoptic view over all the Yangtze intermediate area. StripMapmode images will be exploitedfirstly toqualify the water extraction from WideScaSAR mode Such validated water masksderived from Wide ScanSar acquisitions will allow completing the alreadyexisting database, consisting of several hundreds of satellite images, allowinga ten days temporal period of revisit (on-going since 2000). A betterunderstanding of the monsoon lakes behaviour, in a context of regional andglobal climatic change, could allow confirming a potential drought trendobserved over the last decade, involving rainfall component and a multi-scaleanalysis. Thanks to TerraSAR-Xdata the monitoring will continue on all these study areas. Over Poyang lake,Stripmap data will be exploited within the perspective of developing a monitoringapproach for the small lakes of the Poyang lake natural Reserve, whose size isabout 30 by 30 km², enclosing the Bang Hu, and MeixiHu, two areas where thevery rare and endangered Siberian cranes, and Oriental stork are wintering. Thecharacterization and understanding of the interaction between vegetationresources, water cycle analysis and human interactions, the high Resolution of theSpotlight and more of the Staring Spotlight will be crucial. For the Alsatian test sites, the scaling effect from Stripmap to StaringSpot light data will be analysed, all being very convenient in regards to the spatialdistribution of the wetlands in the central Alsatian flood plain, the extent offall-winter inundations, and also in regards to size of the most sensitiveecosystems, ie Rohrmatten wetlands and Muttersholtz grasslands.

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