| Delineation of Water Inundation Areas Using Landsat8 Data in Gorgan Sub-Basin |
| کد مقاله : 1108-IHA (R1) |
| نویسندگان |
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اعظم نجفی وفا *1، Seiyed Mossa Hosseini2 1تهران، خیابان کارگر شمالی،( امیرآبادشمالی، ) کوچه ۱۸، خوابگاه دخترانه فاطمیه 2Associate Professor, Physical Geography Dept., University of Tehran, P.O. Box 14155-6465, Tehran, Iran |
| چکیده مقاله |
| The precise mapping of water inundation areas in terms of both spatial distributions and temporal variability is the basis for providing fundamental information on flood risk mitigation strategies and helps in efficient water resource management. High-precision remotely sensed data is frequently used for the identification of water inundation areas in watershed scales. Different indices have been developed and implemented to identify the flooded areas. In this study, three indices of Normalized Difference Water Index - Modified Normalized Difference Water Index (NDWI-MNDWI), Automated Water Extraction Index (AWEI), and Water Index (WI) are calculated using the Landsat 8 images in Google Earth Engine platform. The Validation results showed that the AWEI index with an accuracy and kappa coefficient equal to 98% and 96%, respectively is more efficient than the other indices in identifying water inundation areas in the study area. Moreover, the Pearson’s correlation coefficient between the time-series of water inundation areas identified by the AWEI index and the corresponding daily discharge data recorded in Nomel Dam station (r= 0.593) indicates better performance of this index rather than WI and NDWI-MNDWI (i.e., r= 0.521 and 0.468). The indices adopted in this study could potentially use for the identification of water inundation areas, especially for the floods and precise-topography data scares regions. |
| کلیدواژه ها |
| Gorgan, Water inundation area, Remote Sensing, Landsat 8, Water Extraction Indices |
| وضعیت: پذیرفته شده برای ارائه شفاهی |