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首页> 外文会议>Proceedings of GlobWetland: Looking at Wetlands from Space >HYDROPERIOD OF DO?ANA MARSHES: NATURAL OR ANTHOPIC ORIGIN OF INUNDATION REGIME？
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HYDROPERIOD OF DO?ANA MARSHES: NATURAL OR ANTHOPIC ORIGIN OF INUNDATION REGIME？

机译：多纳河沼泽的水生：淹没机制的自然起源或非传统起源？

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摘要

There is a major concern on current restoration and management programmes being applied over Do?ana Ramsar Site. Historical inundation regime has been largely changed according to human transformations. On site measurements along short and recent periods have provided scant local information on inundation variability. Historical inundation patterns on a spatial basis are necessary to understand short and long time effects of human transformations on natural regimes. By compiling a long time series of Landsat MSS, TM and ETM images (1975-2006) we have mapped inundation levels for every available scene over Do?ana wetlands. After coregistration, radiometric correction and time series normalization, we applied the best semiautomathic method for discriminating inundation levels according to ground-truth data. Then, we reconstructed for each hydrological cycle the hydroperiod value for every pixel. The value is calculated as the minimum number of days detected as flooded for the available dates during every cycle. Results reveal a significant increase on the average number of days inundated for the whole marsh and local hydroperiod changes related to human transformations and rainfall variability. Hydroperiod maps are therefore helping to understand hydrological implications of future management decisions.
机译：人们对当前在Do？ana Ramsar站点上应用的恢复和管理计划非常关注。历史的淹没制度已经根据人类的转变而发生了很大的变化。短期和近期的现场测量提供的关于淹没变异性的本地信息很少。为了了解人类改造对自然制度的短期和长期影响，有必要在空间上进行历史淹没模式。通过汇编长时间的Landsat MSS，TM和ETM图像序列（1975-2006年），我们已绘制了多纳纳湿地上每个可用场景的淹没水平。经过定心，辐射校正和时间序列归一化后，我们根据地面真实数据应用了最佳的半自动方法来区分淹没程度。然后，我们为每个水文循环重建每个像素的水文周期值。该值计算为每个周期内可用日期检测到的满天的最小天数。结果表明，整个沼泽的平均淹没天数显着增加，与人类转化和降雨多变性有关的局部水文周期变化也显着增加。因此，水文周期图有助于了解未来管理决策的水文含义。

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