Sun Jichao

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Studies about sediment erosion were mainly concentrated on the river channel sediment, the terrestrial sediment, and the underground sediment. The transport process of underground sediment is studied in the paper. The concept of the flush potential sediment is founded. The transport equation with stable saturated seepage is set up, and the relations between(More)
The adsorption of lead by soils is strongly influenced by temperature and various soil characteristics. Soil pH is one of the most important parameters influencing lead-solution and soil-surface chemistry since it affects lead speciation and the charge of soil surface groups. In general, lead adsorption is small at low pH values, and it increases with the(More)
In the urbanization process of Guangzhou, which was characterized by highly centered economy and fast utilized resources, groundwater environment was influenced severely. High concentration of NO2 - and NH4 + in groundwater concentrated in the city center, and samples with over proof NO3 - distributed around the city and hilly areas, besides in the central(More)
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