• 关键词：遥感模型  悬浮物变化  闽江

• 基金项目：福建省教育厅重点项目(No.2005K006)

• 温小乐
• 福州大学环境与资源学院, 空间数据挖掘与信息共享教育部重点实验室, 福州 350002

• 徐涵秋
• 福州大学环境与资源学院, 空间数据挖掘与信息共享教育部重点实验室, 福州 350002

• 摘要：利用同步的遥感影像光谱信息和实测水质数据建立了闽江福州段的悬浮物遥感模型,结合多时相卫星遥感影像,分析了闽江福州段水域在1986～2006年间悬浮物的时空变化规律及其变化原因.研究结果表明,利用悬浮物定量遥感模型可以快速有效地揭示研究水域长期的水质变化规律.总体而言,闽江福州段的悬浮物浓度在这20年间稳中有降,悬浮物浓度不变和浓度下降的水域面积比例分别占到35.59%和45.79%,而高悬浮物浓度的水域面积所占比例则从8.52%下降至0.13%,整体水质趋于好转;但仍有局部水域的悬浮物浓度在此期间呈现上升的趋势,水质有所恶化,这主要是受到周边地区土地利用变化及污水直接排放的影响.

• Abstract：Models for predicting Suspended Sediment Concentrations(SSC) of the Lower Min River(Fuzhou portion) were established using remote sensing data and synchronal sampled in situ water data.The models were then applied to compute the SSC of the Lower Min River in 1986,1996 and 2006,using three Landsat TMimages.Examination of multitemporal images revealed the spatial and temporal variations of SSC in the studied river portion from 1986 to 2006.The results show that the SSC in the river portion generally decreased over the past 20 years,but in some areas it increased in the second decade.The high SSC water accounted for 8.52% of the studied water area in1986 but decreased to 0.13% in 2006.On the other hand,the areas of constant SSC and descending SSC respectively accounted for 35.59% and 45.79% during the study period.All these results indicate the water quality of the study river portion has generally improved.Nevertheless,some water areas showed significant increases in SSC during the study period.This was due largely to land use changes in the surrounding areas.In addition,raw sewage discharged to the river from adjacent towns also contributed to the SSC increase.

• Key words：remote sensing model  SSC variations  Min River

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