SGER:Portable In-situ Wind ERosion Lab (PI-SWERL): Testing and validation

便携式现场风蚀实验室(PI-SWERL)是一种相对较新的仪器，用于研究自然和人造土壤表面的风尘排放。用PI-SWERL进行的初步实验表明，粉尘排放量随着表面施加剪切力而单调增加的传统模型过于简单化，忽略了沉积物供应、结壳和分层的问题。野外研究中收集的数据表明，许多土壤表面的行为偏离了它们在粉尘排放模型中的理想化表示。该项目将对一系列已建土样进行初步测量和相关数据分析。第一个目标是将用PI-SWERL收集的数据与土壤表面的具体物理方面联系起来。第二个目标是描述一种新型跳跃传感器在这些受控条件下的响应。在世界许多地区，特别是那些气候半干旱或季节性干旱的地区，风的侵蚀和输送是一个主要问题。风对土壤的影响对农用地的合理管理具有重要意义。这种从Pi-SWERL数据中提取土壤表面物理特征信息的方法将为从机制上理解风尘排放提供一种新的技术，所产生的信息将显著提高干旱地区土壤风蚀模型表示的保真度。

The Portable In-situ Wind ERosion Lab (PI-SWERL) is a relatively recent instrument that is used to study windblown dust emissions from natural and artificial soil surfaces. Initial experiments with the PI-SWERL indicate that the traditional models whereby dust emissions increase monotonically with shear stress applied to the surface are overly simplistic and ignore issues of sediment supply, crusts, and layering. Data collected during field studies indicate that the behaviors of many soil surfaces stray from their idealized representations in dust emissions models. This project will undertake a set of preliminary measurements and related data analysis on a series of constructed soil test plots. The first goal is to relate data collected with the PI-SWERL to specific physical aspects of the soil surface. A second goal is to characterize the response of a new type of saltation sensor under these controlled conditions. Wind erosion and transport is a major problem in many parts of the world, especially those with semi-arid or seasonally arid climate. The effects of wind on soil has very significant implications for the proper management of agricultural land. This approach for extracting information on the physical aspects of a soil surface from PI-SWERL data would enable a new technique for mechanistically understanding eolian dust emissions, and the resultant information could significantly improve the fidelity of model representation of wind erosion of soils in arid regions.