The results show that the rate of sediment detachment of sloping fallow overland flow increases with the rise of the slope gradient, rainfall energy and runoff energy, and the sediment detachment rates.

A dualbox system, consisting of a feeder box located at upslope and a test box located at down_slope, was used to analyze characteristics of rill erosive sediment particle size distribution with 150 gradients under different rainfall intensities and sediment concentrations in the upslope runoff.

Runoff datum and runoff and sediment nutrition content were analyzed in order to research the influence of different land use types on soil erosion and nutrition care effect.

The mechanisms of soil aggregates detachment by rainfall and loss by runoff was conducted to seek explanation for thy enrichment of N and P in eroded sediment to original soil in thy rainfall simulation experiment with a constant rainfall rate of 72 mm/h.

River sediment erosion from the upper reaches, riverway sediment transportation, and estuary sediment deposition; are all closely related to river physicochemical process.

Based on the analysis and comparison of a number of Ro data,this study established maturity equations (Ro -H) of the Jiyang depression of both the Cenozoic and the Upper Paleozoic,through which the eroded thickness of the discontinuity surface between the Mesozoic and the Paleozoic in the Jiyang depression was restored.

Based on thermal history reconstruction and estimation of eroded thickness, the maturation and stages of hydrocarbon generation have been investigated for the pre_Tertiary(mainly Permian) source rocks in South basin, the southern Yellow Sea.