科研之友
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摘要
Current laboratory methods for creating rough soil surfaces for surface runoff infiltration, and soil erosion experiments are limited in their ability to duplicate rough surfaces with uniform soil properties (e.g., bulk density) throughout the soil profile. A new method for replicating rough soil surfaces with uniform bulk density was developed. The new method utilizes a laboratory-scale soil box and surface mold constructed with desired rough surface microtopography. For experiments, the surface mold was set on a plane parallel with the bottom of the soil box at a height governed by the desired soil profile depth. The soil box was then rotated 90, soil was incrementally packed in 5-cm layers in the void volume between the mold and the soil box, the soil box was then rotated 90 back to horizontal, and the surface mold was removed. The ability to replicate rough surface microtopography was verified by creating five rough soil surfaces using the aforementioned method, scanning the surfaces using an instantaneous-profile laser scanner to obtain high resolution DEMs, and determining their maximum ponding area (MPA) and maximum depression storage (MDS) using a Puddle Delineation (PD) program. Each surface was then evaluated by comparing the computed MDS and MPA against the actual surface mold values. The average MPA and MDS relative errors of the five surfaces from the mold surface were 1.85% and 1.86%, respectively. A separate rough surface also was packed for evaluating bulk density of the packed soil using the replication method. Based on the two-tailed t-test, bulk density was statistically uniform for 12 sample locations across the soil surface and throughout the soil profile. The new method proved efficient and effective at producing soil surfaces with identical rough surface microtopography and uniform bulk density.
- 出版日期2011-7
