1 X 319 X X ' E 'N m 1 1 TWWC YSCC ECSCC Fig. 1 Study area and sampling site TWC - the Taiwan Warm Curre

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1 ACTA SEDIMENTOLOGICA SINICA Vol. 30 No. 2 Apr X X X X Matlab X X X X difan@ ouc. edu. cn P A 0 X X 1 X Matlab X X X 10-2 ~ 10 2 X X X DeMaster X X X Genty X CB

2 1 X 319 X X ' E 'N m 1 1 TWWC YSCC ECSCC Fig. 1 Study area and sampling site TWC - the Taiwan Warm Current YSCC - the Yellow Sea Coastal Current ECSCC - the East China Sea Coastal Current. The shaded areas denote muddy deposition X 98% 2% X 37 ~ 38 cm 93 ~ 95 cm Photoshop X 3B X 2. 2 X SIEMENS FX X Matlab7. 0 imread 2 18 Fig. 2 Grain-size compositions of Core X 16 ma /70keV X 3A X 0 ~ 55 cm

3 X A. X B. X Fig. 3 X-ray negative of Core 18 A. original X-ray negative B. processed X-ray negative rgb2gray mm X 70 ~ X Fig. 4 The gray image of X-ray radiograph 11 cm 26 cm 38 cm negative of Core X Table 1 The matrix of the gray image of X-ray radiograph negative of Core

4 1 X A - F Fig. 5 The gray values curves of the Core cm 38 cm X 38 cm C Table n = 550 Correlations of the 6 rows of the gray values n = 550 A B C D E F A B C D E F 1 **. Correlation is significant at the level 2-tailed. 3 X X X 6 18 Fig. 6 The curves of mean grain-size and gray value in Core cm A. B. A. gray value B. mean grain-size

5 Y = X R 2 = X X X X % X Fig. 7 The correlation between gray value and mean grain-size 18 X 11 X 9 X X 9 X 1 ~ 8 Ⅰ. Ⅱ. Ⅲ. Fig. 8 The correlations between gray value and sand silt and clay Ⅰ. gray value and sand content Ⅱ. gray value and silt content Ⅲ. gray value and clay content

6 1 X X 2 X 3 X References 1. J Sun Donghuai Liu Yu Tan Ming. The application and analysis of the digital image of paleoenvironmental records J. Chinese Science Bulletin J Yang Zuosheng Cheng Xiao. Centurial high resolution records of sediment grain-size variation in the mud area off the Changjiang Yangtze River estuary and its influencial factors J. Quaternary Science Fig. 9 The grain-size normalized gray curve of core Bio-Si J cm 10 ~ 12 cm Fan Dejiang Qi Hongyan Sun Xiaoxia et al. A 2. 1 cm /a 3 new method to evaluating sedimentary rate on the Yangtze River subaqueous delta Seasonal sedimentary record of Bio-Si J. Periodical of Ocean University of China DeMaster D J McKee B A Nittrouer C A et al. Rates of sediment ENSO accumulation and particle reworking based on radiochemical measurements from continental shelf deposits in the East China Sea J. Conti- nental Shelf Research Kniskern T A Kuehl S A. Spatial and temporal variability of seabed disturbance in the York River subestuary J. Estuarine Coastal and Shelf Science Bentley S J Sheremet A JaegerJ M. Event sedimentation bioturbation and preserved sedimentary fabric Field and model comparisons in 3 three contrasting marine settings J. Marine Geoglogy X J Fan Dejiang Xu Lin Qi Hongyan. Bioturbation in surficial sediment of subaqueous X 1 Changjiang river delta J. Oceanologia et Limnologia Sinica

7 J Yang Qunhui Zhou Huaiyang Ji Fuwu et al. Bioturbation in seabed sediments and its effects on marine sedimentary processes and records J. Advances in Earth Sciences J. D Qin Xiaoguang Liu Dongsheng Tan Ming et al. The micro level gray scale characteristics of Beijing Shihuadong stalagmite and its climatic Significance J. Science in China Series D Genty D Baker A Maire R. Comparison of annual luminescent and 248 visible laminae in stalagmites Comptes Rendus DeL Academie des Sciences Ser Ⅱ. Fascicule A J. Sciences Dela Terreet des Planetes J Jiao Chunwen. Study on anti scour test in rock river bed by project comparison method J. Journal of Yangtze 10. River Scientific Research Institute The Gray Value of X-ray Radiograph in Sediment Core and Its Influencing Factors ZHANG Xi-lin FAN De-jiang LIU Ming WANG Liang College of Marine Geosciences Key Laboratory of Submarine Geosciences and Technology of Ministry of Education Ocean University of China Qingdao Shandong Abstract X-ray radiograph of sedimentary core contains much information including sedimentary texture density structure etc. We can quickly extract the information of climate and environment changes from sedimentary core by using digital image processing method witch may be a powerful research tools to exploring high-resolution sedimentary records and palaeo-environment evolution. Based on the matlab software platform we obtained the X-ray images of the sediment core taken from the subaqueous Yangtze River delta and changed them into digital gray images then for extracting their gray values. Combined with the sediment properties in the core such as grain size parameters influencing factors of the digital gray values were discussed. The results indicate that the gray values of sediment core are influenced comprehensively by sediment composition texture and structure with being dominantly influenced by sediment grain-size. There is a good linear relationship between mean grain-size and gray value. Furthermore there is a positive correlation between sand silt and gray value. In contrary it is of a good negative relationship between clay and gray value. Generally the X-ray image gray value of sediment core may be an ideal proxy of comprehensive sedimentary records. Key words sediment core X-ray radiograph gray value grain-size influencing factor