Science Service System

Summary of Proposal LAN1623

TitleWater resources monitoring for biodiversity and health issues
Investigator YESOU, Hervé - SERTIT - UDS, N/A
Team Member
Pr LAI, Xijun - Nanjing Institute of Geography and Limnology, NIGLAS, State key laboratory of lakes and environment studies
Mrs DAILLET-ROCHETTE, Sylviane - LEGOS/CNES, N/A
Dr CAO, Lei - University of Science and Technology of China School of Life Sciences, N/A
Mr GIRAUD, Henri - SERTIT - UDS, N/A
Pr HUANG, Shifeng - China Institute of Water Resource and Hydropower Research (IWHR), N/A
SummaryThe purpose of this study is to extend the work realized in the very fruitful “Flood DRAGON 1-2” projects that addressed issues such as water resources, environmental preservation, and public health. Water monitoring in general constitutes the angular stone of the project, but more specific study fields related to water monitoring can be defined: water extent, height and quality assessment, wetland ecosystem understanding, epidemiology, regional interaction and global context. The work will focus on the middle and lower Yangtze River reaches, since several hundred millions of inhabitants live downstream of Three Gorges dam and depend directly on the natural services that wetlands are able to provide. Regulating or provisioning services such as respectively flood storage or fishing for example, are crucial benefits offered by the Yangtze River and the numerous lakes along its course. In addition of the Poyang and Dongting lakes that have been monitored from the beginning of the first DRAGON project, the study will be extended to smaller lakes located downstream in the Anhui Province, but also upstream with the Rouergai and Napahai wetland systems, respectively in the three valleys region and on the Qinghai plateau. As regards water monitoring, the trends of change in Poyang and Dongting lakes are observed over more than ten years whereas for the small lakes in the Anhui Province the changes are much more rapid, occurring within only a few years. Up to now these small lakes, disconnected by sluices from the Yangtze River flow, have been poorly investigated even if these have also a very important role in terms of public health management and to maintain biodiversity. TerraSAR-X data will be crucial to continue the monitoring of all these areas of interest. For Poyang and Dongting lakes, ScanSAR mode data will be exploited in order to complete the already existing database, consisting of several hundreds of satellite images, allowing a ten days temporal period of revisit (on-going since 2000). In addition, StripMap mode images will be very helpful in the perspective of developing a monitoring approach for the small lakes of the Anhui Province, whose size is about 30 by 15 km², as well as for the Napahai and Rouergai wetland complex, exploiting archive imagery acquired since 2007. As regards water height monitoring, the objective of data continuity remains also important for the two main lakes, as well as for the small lakes. Integration of more virtual gauge stations derived from historical or on-going (i.e. RA-2 on board of ENVISAT and Jason-2) altimetry missions all over the Yangtze River course and associated lakes, in order to be compared and validated thanks to in situ gauge measurements, is also forecast. For soil erosion and water quality monitoring, an analysis of the relationship between soil erosion and land use land cover change (LUCC) will be investigated. Wetland mapping and biodiversity values analyses will focus on the interaction between vegetation resources, water cycle analysis and human interactions. High Resolution (HR) imagery will be exploited for mapping the vegetation phenology and quality (in terms of feeding resources for birds). Anthropic elements (dikes, tree planting, fish farms / traps) will be derived from HR and Very High Resolution (VHR) imagery. The final aim is to model, map and explain the distribution of biodiversity and their associated habitats, explaining spatio-temporal changes in biodiversity caused by biotic and abiotic factors. The Yangtze River reaches are also under the threat of epidemics related to the water cycle, the main ones being schistosomiasis, avian influenza, echinococcosis or leishmaniasis. A better understanding of the monsoon lakes behaviour, in a context of regional and global climatic change, could allow confirming a potential drought trend observed over the last decade, involving rainfall component and a multi-scale analysis.

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