Model investigation about the potential of C band SAR in herbaceous wetlands flood monitoring

Estimating Flow Resistance of Wetlands Using SAR Images and Interaction Models

“…The main input values to the model are summarized in Table 2. This microwave interaction model was successfully validated in previous works and it was used as a key component of a water level retrieval scheme in junco marshes [6,10,15]. Using this model, and the inputs of Table 2, it is possible to simulate σ 0 values of the junco marsh for intermediate JPD values.…”

“…The determination of marsh water storage capacity consists on the estimation of the volume of water inside the wetland as a function of time, and can be obtained using microwave remote sensing data [3,14]. This magnitude was previously estimated in the Paraná River wetland for flooded and nonflooded conditions using field data and ENVISAT ASAR images [4,15]. Characterization of the hydraulic conductivity is a much more difficult task, which requires the estimation of the drag coefficient of vegetated areas of different places of the watershed [2].…”

“…For all the cases, the samples were extracted from eighteen patches of 2 m × 2 m randomly selected from six large homogeneous junco marsh areas (~0.25 Km 2 , see Figure 1). More details of the fieldwork procedure and the data statistical analysis are given in [10] and [15]. From the figure, it can be seen that the values of the backscattering coefficient change ~6 dB from normal condition (green) to burned condition (red).…”

“…This model is capable of simulating the interaction of electromagnetic waves with vegetation and to estimate the junco marsh σ 0 values, provided their geometric and dielectric properties are given as inputs [6]. This model has the advantage of being already tested for junco marshes in different (and extreme) environmental conditions [4,6,15]. Furthermore, this approach has the advantage of being based on physical hypothesis about the vegetation structure and the interaction between vegetation and electromagnetic radiation.…”

Toward Estimating Wetland Water Level Changes Based on Hydrological Sensitivity Analysis of PALSAR Backscattering Coefficients over Different Vegetation Fields

“…They found that the ERS-2 σ is closely related to both soil moisture and water level changes in the Marl Prairie sites which seasonally experience complete dry condition. Later, Grings et al [18,19] used C-band Envisat ASAR scenes and electromagnetic models with field work data to examine SAR backscatter responses to water level changes over marshes of the Parana River Delta. In addition, Trung et al [20] studied changes in land cover classes in the Tonle Sap floodplain using PALSAR and MODIS data with a land cover model as a function of water level.…”