 delta where it empties into the South China Sea. The climate of the Mekong region is influenced by the Southwest and Northeast monsoons. The tropical monsoonal regime in lower Mekong area generates a distinctly biseasonal pattern of wet and dry periods of more or less equal length. This results in an annual flood pulse and therefore a distinct seasonality in the annual hydrological cycle between a flood season and a low-flow season. The strong seasonal variations in rainfall leads to extreme conditions for the people of the lower Mekong Region: Large-scale and long-lasting floods alternating with periods of drought and water shortage. Floods and droughts can occur anywhere in the basin imposing large economic and social costs on the people . Therefore monitoring of soil moisture conditions in Mekong basin is valuable for many hydrological and agricultural applications. The study includes a catchment-base noise analysis of soil moisture data in lower Mekong basin to identify the areas where soil moisture retrieval is robust and applicable. In general, the seasonal variability of soil moisture in Mekong basin is well captured by the retrieval method especially in agricultural areas. Comparison of the soil moisture data with topography and land cover classifications showed that the soil moisture noise increases in highlands with complex topography and in areas covered by very dense vegetation. It is found that the quality of soil moisture is strongly degraded during oversaturated soil situations particularly by large flooded events in delta region in Vietnam and Tonle Sap basin in Cambodia during the peak of the wet season. Furthermore, a catchment-base statistical analysis of the soil moisture data has been carried out to evaluate the relation between the Basin Water Index (BWI), an indicator of the basin soil moisture condition, with in-situ hydrometeorological measurements in different months of year. The results of analysis also showed significant correlations between Enso events and monthly BWI anomaly measurements.
|Document Type:||Conference or Workshop Item (Poster)|
|Title:||Analysis of Soil Moisture Data Retrieved from C-band Scatterometers in Southeast Asia|
|Journal or Publication Title:||IEEE International Geoscience and Remote Sensing Symposium (IGARSS)|
|In ISI Web of Science:||No|
|Keywords:||ERS, Metop, ASCAT, Scatterometer, soil moisture, Mekong|
|Event Title:||IGARSS 2012, IEEE International Geoscience and Remote Sensing Symposium|
|Event Type:||international Conference|
|Event Dates:||22-27 July|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Space|
|HGF - Program Themes:||Earth Observation|
|DLR - Research area:||Raumfahrt|
|DLR - Program:||R EO - Erdbeobachtung|
|DLR - Research theme (Project):||R - Vorhaben Fernerkundung der Landoberfläche|
|Institutes and Institutions:||German Remote Sensing Data Center > Land Surface|
|Deposited By:||Dr.techn. Vahid Naeimi|
|Deposited On:||06 Nov 2012 11:16|
|Last Modified:||06 Nov 2012 11:16|
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