Applications of Radarsat‐1 synthetic aperture radar imagery to assess hurricane‐related flooding of coastal Louisiana

The Louisiana coast is subjected to hurricane impacts including flooding of human settlements, river channels and coastal marshes, and salt water intrusion. Information on the extent of flooding is often required quickly for emergency relief, repairs of infrastructure, and production of flood risk maps. This study investigates the feasibility of using Radarsat‐1 SAR imagery to detect flooded areas in coastal Louisiana after Hurricane Lili, October 2002. Arithmetic differencing and multi‐temporal enhancement techniques were employed to detect flooding and to investigate relationships between backscatter and water level changes. Strong positive correlations (R 2 = 0.7–0.94) were observed between water level and SAR backscatter within marsh areas proximate to Atchafalaya Bay. Although variations in elevation and vegetation type did influence and complicate the radar signature at individual sites, multi‐date differences in backscatter largely reflected the patterns of flooding within large marsh areas. Preliminary analyses show that SAR imagery was not useful in mapping urban flooding in New Orleans after Hurricane Katrina's landfall on 29 August 2005.

[1]  Andrew J. Blanchard,et al.  DETECTION OF LOWLAND FLOODING USING ACTIVE MICROWAVE SYSTEMS. , 1985 .

[2]  R. Oberstadler,et al.  Assessment of the mapping capabilities of ERS-1 SAR data for flood mapping: a case study in Germany , 1997 .

[3]  Maycira Costa,et al.  Biophysical properties and mapping of aquatic vegetation during the hydrological cycle of the Amazon floodplain using JERS-1 and Radarsat , 2002 .

[4]  T. J. Pultz,et al.  Case studies demonstrating the hydrological applications of C-band multipolarized and polarimetric SAR , 2004 .

[5]  G. Kuecher.  Geologic Framework and Consolidation Settlement Potential of the Lafourche Delta, Topstratum Valley Fill; Implications for Wetland Loss in Terrebonne and Lafourche Parishes, Louisiana. , 1994 .

[6]  M. Imhoff,et al.  The derivation of a sub-canopy digital terrain model of a flooded forest using synthetic aperture radar , 1990 .

[7]  Yong Wang,et al.  Understanding the radar backscattering from flooded and nonflooded Amazonian forests: Results from canopy backscatter modeling☆ , 1995 .

[8]  Paul D. Bates,et al.  Waterline mapping in flooded vegetation from airborne SAR imagery , 2003 .

[9]  D. Mason,et al.  Flood boundary delineation from Synthetic Aperture Radar imagery using a statistical active contour model , 2001 .

[10]  Philip A. Townsend,et al.  Estimating forest structure in wetlands using multitemporal SAR , 2002 .

[11]  Laurence C. Smith,et al.  Amazon floodplain water level changes measured with interferometric SIR-C radar , 2001, IEEE Trans. Geosci. Remote. Sens..

[12]  Elijah W. Ramsey,et al.  Monitoring flooding in coastal wetlands by using radar imagery and ground-based measurements , 1995 .

[13]  The Use of ERS SAR for Flood Monitoring: AN Overall Assessment , 1996 .

[14]  Nicolas Baghdadi,et al.  Evaluation of C-band SAR data for wetlands mapping , 2001 .

[15]  Kevin B. Smith,et al.  Effects of seasonal hydrologic patterns in south Florida wetlands on radar backscatter measured from ERS-2 SAR imagery , 2003 .

[16]  D. Alsdorf,et al.  Interferometric radar measurements of water level changes on the Amazon flood plain , 2000, Nature.

[17]  C. Moeller,et al.  Sedimentation along the Eastern Chenier Plain Coast: Down Drift Impact of a Delta Complex Shift , 2001 .

[18]  N. Walker,et al.  Impacts of Winter Storms on Circulation and Sediment Transport: Atchafalaya-Vermilion Bay Region, Louisiana, U.S.A. , 2000 .

[19]  Richard K. Moore,et al.  Microwave Remote Sensing - Active and Passive - Volume I - Microwave Remote Sensing Fundamentals and Radiometry , 1981 .

[20]  Kevin B. Smith,et al.  Analysis of space-borne SAR data for wetland mapping in Virginia riparian ecosystems , 2001 .

[21]  Huadong Guo.  Spaceborne and Airborne SAR for Target Detection and Flood Monitoring , 2000 .

[22]  Philip A. Townsend,et al.  Mapping Seasonal Flooding in Forested Wetlands Using Multi-Temporal Radarsat SAR , 2001 .

[23]  Marc L. Imhoff,et al.  Monsoon flood boundary delineation and damage assessment using space borne imaging radar and Landsat data , 1987 .

[24]  Suzanne R. Hawes,et al.  Historical and projected coastal Louisiana land changes: 1978-2050 , 2003 .

[25]  D. S Biggin.  A Comparison of ERS‐1 Satellite Radar and Aerial Photography for River Flood Mapping , 1996 .

[26]  Yong Wang,et al.  Delineation of inundated area and vegetation along the Amazon floodplain with the SIR-C synthetic aperture radar , 1995, IEEE Trans. Geosci. Remote. Sens..

[27]  H. Roberts.  Dynamic Changes of the Holocene Mississippi River Delta Plain: The Delta Cycle , 1997 .

[28]  Haydee Karszenbaum,et al.  Influence of Flood Conditions and Vegetation Status on the Radar Backscatter of Wetland Ecosystems , 2001 .

[29]  Nguyen Thanh Long,et al.  FLOOD MONITORING OF MEKONG RIVER DELTA, VIETNAM USING ERS SAR DATA , 2001 .

[30]  Haydee Karszenbaum,et al.  Mapping wetlands using multi-temporal RADARSAT-1 data and a decision-based classifier , 2002 .

[31]  Robert Woodruff,et al.  Detecting seasonal flooding cycles in marshes of the Yucatan Peninsula with SIR-C polarimetric radar imagery , 1997 .

[32]  Stephen J. Walsh,et al.  Remote sensing of forested wetlands: application of multitemporal and multispectral satellite imagery to determine plant community composition and structure in southeastern USA , 2001, Plant Ecology.

[33]  J. M. Coleman,et al.  Deltaic coastal wetlands , 1989 .

[34]  L. Hess,et al.  Remote sensing of vegetation and flooding on Magela Creek Floodplain (Northern Territory, Australia) with the SIR-C synthetic aperture radar , 2003, Hydrobiologia.

[35]  Stephen L. Durden,et al.  Differentiating methane source areas in Arctic environments with multitemporal ERS-1 SAR data , 1996, IEEE Trans. Geosci. Remote. Sens..

[36]  M. Badji,et al.  Characterisation of flood inundated areas and delineation of poor drainage soil using ERS-1 SAR imagery , 1997 .