Mapping inundation dynamics in a heterogeneous floodplain: Insights from integrating observations and modeling approach
Mapping inundation dynamics in a heterogeneous floodplain: Insights from integrating observations and modeling approach
复制标题
绘制异质洪泛区的洪水动态：综合观测和建模方法的见解
DOI：
10.1016/j.jhydrol.2019.02.039
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发表时间：
2019-05
影响因子：
6.4
通讯作者：
Zhang Qi
中科院分区：
文献类型：
--
作者：
Tan Zhiqiang;Li Yunliang;Xu Xiuli;Yao Jing;Zhang Qi
确定非均质洪泛区地表水的时空动态是困难的，特别是对于其周围的孤立湖泊。由于这些孤立湖泊的出现时间短且不稳定，它们的季节性淹没模式在水动力模型中可能被错误估计。首次对2000 - 2016年鄱阳湖地表水进行了8 d重访频率、30 m空间分辨率的时间序列分析。本研究通过整合Landsat和MODIS数据，采用改进的分层时空自适应融合模型（HSTAFM）进行。评估了基于模型的地表水与遥感地表水之间的差异，并讨论了可能的原因。结果表明，改进后的HSTAFM能够更好地探测河漫滩的水特征，从而提供比MODIS MOD13Q1产品更详细的季节性孤立湖系统信息。利用融合产物发现，三峡大坝蓄水后，鄱阳湖经历了较长的低潮期，湖水明显萎缩。这些差异中很大一部分（平均36%）分布在季节性孤立湖泊中，主要发生在高水位期间。水动力模型的不确定性可能归因于较小的湖泊边界、水深变化、人为干扰和未考虑的地下水补给/排放。这些结果为模拟地表水的时间连续和空间动态评价提供了新的认识，对未来水动力模型的改进具有重要意义。
Determining the spatiotemporal dynamics of surface water in a heterogeneous floodplain is difficult, especially for its surrounding isolated lakes. Seasonal inundation patterns of these isolated lakes can be misestimated in a hydrodynamic model due to their short and erratic appearances. A surface water time series of Poyang Lake having an 8-day revisit frequency with a 30 m spatial resolution from 2000 to 2016 was conducted for the first time. This study was produced with a modified hierarchical spatiotemporal adaptive fusion model (HSTAFM) by integrating both Landsat and MODIS data. Discrepancies between model-based surface water and remotely-sensed surface water were evaluated, and possible causes were discussed. Results show that the modified HSTAFM can better detect the water features of a floodplain, thereby providing more detailed information in an seasonal isolated lake system than the MODIS MOD13Q1 product. With the fusion product, we found that Poyang Lake evidently shrank after experiencing a longer low-water period after the impoundment of the Three Gorges Dam. A large proportion of these discrepancies (averaging 36%) between model-based and remotely-sensed surface water distributed in seasonal isolated lakes, mainly occurred during high-water level periods. Uncertainties in the hydrodynamic model might attribute to smaller defined lake boundaries, bathymetric variations, human disturbance, and unconsidered groundwater recharge/discharge. These results provide a new insight into the temporally continuous and spatially dynamic assessment of simulated surface water, which is essential for the future improvement in the hydrodynamic model.
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影响因子：
2.3
作者：
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影响因子：
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作者：
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