科研之友
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摘要
Information on spatial distributions of soil water content and mechanical strength is fundamental to hydrogeomorpho-logical studies in mountainous watersheds. For simultaneous measurements of soil water content, theta, and penetration resistance, N(c), of soil mantles on natural hillslopes, we developed a new type of combined penetrometer-moisture probe (CPMP). The new CPMP has a robust configuration to reduce the frequency of moisture probe breakdowns during penetration into gravelly and rocky natural soils, and it has a penetration depth of up to 552 cm, which is about four to 14times greater than the maximum measurable depth of any previous CPMP developed for agricultural soils. Laboratory calibrations and field validations showed that the CPMP succeeded in producing vertical distributions for theta and N(c) similar to those measured with conventional methods. The CPMP provided less time-consuming and less destructive measurements of theta profiles than conventional methods that require excavation of deep trenches. Because theta profiles consider the stratified characteristics of soil mantles as well as the depths of groundwater tables, the CPMP was more effective than the conventional cone penetrometer for surveying the hydrogeomorphological structure of soil mantles.
- 出版日期2009-2
