CAJ | 학술논문

二类水体光学活性成分的复杂性导致了水体光学特性的复杂性.通过对太湖区域实测高光谱数据的分析.进一步认识了太湖水体的光谱特性与悬浮泥沙浓度之间的关系:最大反射峰波长随着悬浮泥沙浓度的增加向短波方向移动,即"蓝移现象";敏感波段区域的光谱曲线对波长的积分面积与悬浮泥沙浓度之间具有良好的线性关系,近似后的梯形面积模型能较好地反映太湖泥沙浓度状况,并适用于LandSat/TM等多光谱卫星影像数据反演.梯形面积模型的反演,结果表明太湖区域悬浮泥沙浓度主要集中在30～80 mg·L~(-1)之间,分布呈现湖西、湖南和湖心高,湖东低的格局;与实测数据相比较,反演模型相对误差为6.035%.
이류수체광학활성성분적복잡성도치료수체광학특성적복잡성.통과대태호구역실측고광보수거적분석.진일보인식료태호수체적광보특성여현부니사농도지간적관계:최대반사봉파장수착현부니사농도적증가향단파방향이동,즉"람이현상";민감파단구역적광보곡선대파장적적분면적여현부니사농도지간구유량호적선성관계,근사후적제형면적모형능교호지반영태호니사농도상황,병괄용우LandSat/TM등다광보위성영상수거반연.제형면적모형적반연,결과표명태호구역현부니사농도주요집중재30～80 mg·L~(-1)지간,분포정현호서、호남화호심고,호동저적격국;여실측수거상비교,반연모형상대오차위6.035%.
The complicated compositions of Case Ⅱ waters result in the complex properties of spectral curves. The present paper analyzed the in situ measurements data of spectral curves, and further realized the relationships between the properties of spectral curves and suspended sediment concentration. The study found that the max peak of spectral curves was moving to the direction of shortwavelength as increasing suspended sediment concentration, namely the blue shift of wavelength; the area enclosed by spectral curve and coordinate axis in the range of sensitive bands had preferably linear relationship with the suspended sediment concentration (curve area model); the trapezoidal area model which was an approximation of curve area model could also excellently reflect those relationships, and be greatly suitable for multi-spectral satellite imagery retrieval such as LandSat/TM, MODIS and so on. The inversion results of trapezoidal area model for LandSat/TM imagery on October 27, 2003 in Taihu Lake showed that the suspended sediment concentration ranged from 30 to 80 mg · L~(-1), the distribution pattern was higher in the west, south and central lake and lower in the east lakes compared with the in situ measurements in the regions, and the relative error of retrieval model was 6. 035%.