Lake topography and wind waves determining seasonal-spatial dynamics of total suspended matter in turbid Lake Taihu, China: assessment using long-term high-resolution MERIS data.
Lake topography and wind waves determining seasonal-spatial dynamics of total suspended matter in turbid Lake Taihu, China: assessment using long-term high-resolution MERIS data.
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湖泊地形和风浪决定中国浑浊太湖总悬浮物的季节空间动态：使用长期高分辨率 MERIS 数据进行评估
DOI：
10.1371/journal.pone.0098055
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发表时间：
2014
期刊：
影响因子：
3.7
通讯作者：
Qin B
中科院分区：
文献类型：
--
作者：
Zhang Y;Shi K;Liu X;Zhou Y;Qin B
2005 - 2010年，针对太湖水体中总悬浮物（TSM）变化较大的特点，开展了多项现场生物光学综合调查，并对基于中分辨率成像光谱仪（MERIS）数据的TSM浓度估算模型进行了标定和验证。利用MERIS遥感影像第9波段的大气顶辐射率（TOA）数据，结合区域经验大气校正模型，建立了太湖水体中TSM浓度的估算模型，该模型与水体中TSM浓度有较强的相关性（r2 = 0.72 0，p<0.0 0 1，n = 73）。 相对均方根误差（RRMSE）和平均相对误差（MRE）分别为36.9%和31.6%，基于一个独立的验证数据集，产生可靠的估计TSM浓度。将该算法应用于2003 - 2011年的50幅MERIS图像，获得了太湖水体中TSM浓度的时空异质性。在季节上，TSM浓度最高和最低分别出现在春季和秋季。在空间分布上，东太湖的TSM浓度在湖中心和湖南部较高，在胥口湾较低。湖泊地形，包括水深和距海岸的距离，对TSM的空间分布有显着的影响。太湖水体中TSM浓度与日平均风速呈显著正相关（r2 = 0.6 85，p<0.0 0 1，n =5 0），表明风速对水体中TSM浓度的变化起着重要作用。 此外，低TSM浓度与沉水水生植被（SAV）的出现有关。因此，TSM的动态控制湖泊地形，风力驱动的沉积物再悬浮和SAV分布。
Multiple comprehensive in situ bio-optical investigations were conducted from 2005 to 2010 and covered a large variability of total suspended matter (TSM) in Lake Taihu to calibrate and validate a TSM concentration estimation model based on Medium Resolution Imaging Spectrometer (MERIS) data. The estimation model of the TSM concentration in Lake Taihu was developed using top-of-atmosphere (TOA) radiance of MERIS image data at band 9 in combination with a regional empirical atmospheric correction model, which was strongly correlated with the in situ TSM concentration (r 2 = 0.720, p<0.001, and n = 73). The relative root mean square error (RRMSE) and mean relative error (MRE) were 36.9% and 31.6%, respectively, based on an independent validation dataset that produced reliable estimations of the TSM concentration. The developed algorithm was applied to 50 MERIS images from 2003 to 2011 to obtain a high spatial and temporal heterogeneity of TSM concentrations in Lake Taihu. Seasonally, the highest and lowest TSM concentrations were found in spring and autumn, respectively. Spatially, TSM concentrations were high in the southern part and center of the lake and low in Xukou Bay, East Lake Taihu. The lake topography, including the water depth and distance from the shore, had a significant effect on the TSM spatial distribution. A significant correlation was found between the daily average wind speed and TSM concentration (r 2 = 0.685, p<0.001, and n = 50), suggesting a critical role of wind speed in the TSM variations in Lake Taihu. In addition, a low TSM concentration was linked to the appearance of submerged aquatic vegetation (SAV). Therefore, TSM dynamics were controlled by the lake topography, wind-driven sediment resuspension and SAV distribution.
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