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首页> 外文期刊>Environmental Monitoring and Assessment >Monitoring and assessment of seasonal land cover changes using remote sensing: a 30-year (1987-2016) case study of Hamoun Wetland, Iran
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Monitoring and assessment of seasonal land cover changes using remote sensing: a 30-year (1987-2016) case study of Hamoun Wetland, Iran

机译：使用遥感监测和评估季节性土地覆盖变化：伊朗哈默恩湿地的30年（1987-2016年）案例研究

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摘要

The availability of Landsat data allows improving the monitoring and assessment of large-scale areas with land cover changes in rapid developing regions. Thus, we pretend to show a combined methodology to assess land cover changes (LCCs) in the Hamoun Wetland region (Iran) over a period of 30-year (1987-2016) and to quantify seasonal and decadal landscape and land use variabilities. Using the pixel-based change detection (PBCD) and the post-classification comparison (PCC), four land cover classes were compared among spring, summer, and fall seasons. Our findings showed for the water class a higher correlation between spring and summer (R (2) = 0.94) than fall and spring (R (2) = 0.58) seasons. Before 2000, similar to 50% of the total area was covered by bare soil and 40% by water. However, after 2000, more than 70% of wetland was transformed into bare soils. The results of the long-term monitoring period showed that fall season was the most representative time to show the inter-annual variability of LCCs monitoring and the least affected by seasonal-scale climatic variations. In the Hamoun Wetland region, land cover was highly controlled by changes in surface water, which in turn responded to both climatic and anthropogenic impacts. We were able to divide the water budget monitoring into three different ecological regimes: (1) a period of high water level, which sustained healthy extensive plant life, and approximately 40% of the total surface water was retained until the end of the hydrological year; (2) a period of drought during high evaporation rates was observed, and a mean wetland surface of about 85% was characterized by bare land; and (3) a recovery period in which water levels were overall rising, but they are not maintained from year to year. After a spring flood, in 2006 and 2013, grassland reached the highest extensions, covering till more than 20% of the region, and the dynamics of the ecosystem were affected by the differences in moisture. The Hamoun wetland region served as an important example and demonstration of the feedbacks between land cover and land uses, particularly as pertaining to water resources available to a rapidly expanding population.
机译：Landsat数据的可用性可以通过快速发展的地区的土地覆盖变化来改进对大型区域的监视和评估。因此，我们假装展示一种组合的方法来评估30年期间（1987年至2016年）哈莫恩湿地地区（伊朗）的土地覆被变化（LCC），并量化季节性和年代际景观与土地利用的变化。使用基于像素的变化检测（PBCD）和分类后比较（PCC），在春季，夏季和秋季之间比较了四种土地覆被类别。我们的研究结果表明，与秋季和春季（R（2）= 0.58）季节相比，春季和夏季（R（2）= 0.94）之间的水相关性更高。在2000年之前，裸露的土壤覆盖了总面积的50％，水覆盖了40％。但是，在2000年之后，超过70％的湿地变成了裸露的土壤。长期监测期的结果表明，秋季是最有代表性的时间，表明LCC监测的年际变化，而受季节尺度气候变化影响最小。在哈默恩湿地地区，土地覆盖受到地表水变化的高度控制，而地表水变化又对气候和人为影响作出了反应。我们能够将水预算监测分为三个不同的生态系统：（1）高水位时期，可以维持健康的广泛植物寿命，并且直到水文学年结束之前，大约40％的地表水被保留下来。 ; （2）观察到高蒸发率的干旱时期，平均湿地表面约有85％的土地为裸地。 （3）恢复期，水位总体上在上升，但是每年都没有保持。在春季洪水之后，2006年和2013年，草原达到了最大的延伸，覆盖了该地区的20％以上，并且生态系统的动态受到水分差异的影响。哈默恩湿地地区是一个重要的例子，展示了土地覆盖和土地利用之间的反馈，特别是与迅速增长的人口可获得的水资源有关的反馈。

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