Narrow Results

Water pollution refers to a kind of phenomenon of water quality deterioration which causes by the intervention of certain substances that result in changing of its chemical, physical and affecting the effective use of water and being harmful to human health. Water pollution involves surface water pollution and groundwater pollution. Along with the acceleration of urbanization and development of economy, the demand of water resources is increasing and the strength of the development and utilization of water resources is also increasing gradually. Meanwhile, Suzhou city is facing water pollution problems such as poor water quality, shortage of drinking water, etc. Therefore, it is necessary to analyze the research status of water pollution and accelerate the adjustment and optimization of the structure of the water quality. Based on the water quality conditions of its surface water and groundwater and related water pollution data, this article analyzes and evaluates the variations of water quality.

The shear strength of unsaturated soil is one of the important engineering properties. On the basis of referring to the Chinese and foreign literatures, mainly from the theories and formulas, instruments as well as the specific aspects of the experimental research results to summarize, the paper outlines the advance in research on shear strength of unsaturated soil. Although different scholars have carried out extensive studies and obtained certain research results, also, the view of the difference between shear strength of unsaturated soil and shear strength of saturated soil is the matrix suction's contribution to the strength is approved by academia now. There are still some problems that the scope of shear strength formulas of unsaturated soil, the difficulty of measuring matrix suction and the experimental conditions can't reflect the real stress state of unsaturated soil. Therefore, the further researches are needed to improve the shear strength theory system of unsaturated soil.

Sediment quality criteria are the supplement of current water quality criteria and very important in water quality management. The research necessity on the sediments quality criteria were reviewed this paper. The research advances on the main contents and research method of sediments quality criteria in China were also introduced in details. Finally, the weak links, existing problems and future development directions in the research field were pointed out.