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بازیابی شکل موجهای بازگشتی مأموریت ارتفاعسنجی رادار با روزنه مصنوعی Sentinel-3A به‌منظور پایش تراز سطح آبهای درون‌سرزمینی (مطالعه موردی: مخزن سد درودزن شیراز) | ||
| فیزیک زمین و فضا | ||
| مقاله 5، دوره 47، شماره 3، آذر 1400، صفحه 467-483 اصل مقاله (1.03 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/jesphys.2021.322322.1007311 | ||
| نویسندگان | ||
| آرش طایفه رستمی* 1؛ علیرضا آزموده اردلان2؛ شیرزاد روحی3؛ امیرحسین پورمینا4 | ||
| 1دانشجوی کارشناسی ارشد، دانشکده مهندسی نقشه‌برداری و اطلاعات مکانی، پردیس دانشکده‌های فنی، دانشگاه تهران، تهران، ایران | ||
| 2استاد، دانشکده مهندسی نقشه‌برداری و اطلاعات مکانی، پردیس دانشکده‌های فنی، دانشگاه تهران، تهران، ایران | ||
| 3استادیار، گروه ژئودزی، دانشگاه آزاد اسلامی واحد تهران جنوب، تهران، ایران | ||
| 4دانشجوی دکتری، گروه ژئودزی، دانشکده مهندسی نقشه‌برداری، دانشگاه صنعتی خواجه نصیرالدین طوسی، تهران، ایران | ||
| چکیده | ||
| در آبهای درون‌سرزمینی، تراز سطح آب حاصل از دادههای سطح دو ارتفاعسنجی مغشوش میباشد. ازاینرو، برای تصحیح تراز سطح آب اندازه‌گیری‌شده در این نواحی، انجام بازیابی شکل موجهای بازگشتی، الزامی است. در این مطالعه از دادههای سطح دو و سطح یک سنجنده ارتفاع‌سنج رادار SAR (SRAL) مأموریت Sentinel-3A که در حالت رادار با روزنه مصنوعی (SAR) اندازه‌گیری میکند، در بازه زمانی مارس 2016 تا نوامبر 2019 برای پایش تراز سطح آب سد درودزن شیراز استفاده شده است. همچنین برای بازیابی شکل موجهای موجود در دادههای سطح یک نیز از الگوریتم بازیابی حدآستانه به‌ازای حدآستانههای مختلف استفاده شده است. نتایج نشان داد، بازیابنده مرکز ثقل (OCOG) موجود در دادههای سطح دو با مقدار جذر خطای مربعی میانگین (RMSE) 23/38 سانتیمتر و ضریب وابستگی %23/99 با دادههای نوسان‌‌نگار محلی نسبت به دیگر بازیابندههای موجود در دادههای سطح دو از دقت بالاتری در برآورد سری زمانی تراز سطح آب سد درودزن دارد. پسازآن، سری زمانی تراز سطح آب از بازیابندههای موجود در دادههای سطح دو و انتخاب بازیابنده سطح دو بهینه، شکل موجهای بازگشتی از دادههای سطح یک با استفاده از الگوریتم بازیابی حدآستانه ابتدا بازیابی شده و سپس سری زمانی تراز سطح آب به ازای آستانههای مختلف حاصل شده و با دادههای نوسان‌‌نگار محلی مقایسه شد که نتایج نشان داد آستانه %60 با مقدار RMSE 73/37 سانتیمتر و وابستگی %30/99 سبب بهبود %3/1 دقت و افزایش %07/0 وابستگی با دادههای نوسان‌‌نگار نسبت به سری زمانی تراز سطح آب حاصل از بازیابنده سطح دو بهینه شده است. | ||
| کلیدواژه‌ها | ||
| ارتفاعسنجی ماهواره‌ای؛ Sentinel-3؛ بازیابی شکل موجهای بازگشتی؛ تراز سطح آب؛ سد درودزن | ||
| عنوان مقاله [English] | ||
| Retracking Sentinel-3A SAR waveforms to monitor the water level of a small inland water body (Case study: Doroudzan Dam Reservoir, Shiraz, Iran) | ||
| نویسندگان [English] | ||
| Arash Tayfeh Rostami1؛ Ali Reza Azmoudeh Ardalan2؛ Shirzad Roohi3؛ Amir Hossein Pourmina4 | ||
| 1M.Sc. Student, School of Surveying and Geospatial Engineering, College of Engineering, University of Tehran, Tehran, Iran | ||
| 2Professor, School of Surveying and Geospatial Engineering, College of Engineering, University of Tehran, Tehran, Iran | ||
| 3Assistant Professor, Department of Geodesy, South Tehran Branch, Islamic Azad University, Tehran, Iran | ||
| 4Ph.D. Student, Department of Geodesy, College of Geodesy & Geomatics Engineering, K. N. Toosi University of Technology, Tehran, Iran | ||
| چکیده [English] | ||
| In inland water bodies, the water level obtained from the Level-2 data of the altimetry missions is not often correct. Therefore, to correct the water level measured in these areas, it is necessary to retrack the return waveforms. In this study, data from level-2 and level-1 SRAL altimeter of Sentinel-3A mission, measured in SAR mode, in the period from March 2016 to November 2019 to monitor the water level of Doroudzan Dam, has been used. The threshold retracking algorithm with different thresholds has also been used to retrack the waveforms in the level one data. The results showed that the OCOG retracker in L-2 data with an RMSE value of 38.23 cm and a correlation of 99.23% with in situ gauge data compared to other retrackers in L-2 data from Doroudzan dam has higher accuracy in estimating the time series of the water level. The Ocean retracker also has results close to those of the OCOG retracker, indicating that these two retrackers perform well in restoring water levels. After obtaining the water level time series from the retrackers in the L-2 data and selecting the optimal level two retracker, the return waveforms from the L-1 data were first retracked using the threshold algorithm. Then the time series of the water level for different thresholds were obtained and compared with in situ gauge data, which showed that the threshold of 60% with a value of RMSE 37.73 cm and a correlation of 99.30% improved %1.3 in accuracies and increase of %0.07 correlation with in situ gauge data has been optimized for the time series of water level obtained from L-2 retracker. Also, the results showed that, especially in the period from 2017 to 2018, the difference in water levels results from the retracking of the return waveforms with the optimal threshold algorithm (60%) with in situ gauge data less than the optimal L-2 retracker (OCOG). The average water level of Doroudzan Dam from the threshold of 60% was analyzed. Results showed the highest growth in water level with 4.09 m from March 6 to April 2, 2019, which corresponds to usually rainy months. The most significant decrease in the water level with 2.80 meters occurred from April 29, 2019, to May 26, 2019, which are usually low rainfall months. The results also showed that during the study period a slight increase in the water level of Doroudzan Dam was observed. Due to the hard, challenging shape, and topography of Doroudzan Dam and its confused waveforms, therefore, in the above study area, it is not possible to expect high accuracy from both the retrackers in the L-2 data and the results of the waveform retracking. Therefore, the proximity of RMSE results and correlation goes back to the shape and topography of the Doroudzan Dam reservoir. The results of this study show high suitability of the Sentinel-3 mission in monitoring the water level from inland water bodies, which is still a challenging area for satellite altimetry to monitor. Indeed, for a better understanding of the performance of this mission, more samples need to be analyzed. | ||
| کلیدواژه‌ها [English] | ||
| Satellite Altimetry, Sentinel-3, Waveforms Retracking, Water Level, Doroudzan Dam | ||
| مراجع | ||
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