70
5 How to Conduct an Experiment in the Field …
Fig. 5.9 A slope observed in the cameras from different directions. a, b show the images captured
from the camera with sight line perpendicular to the laser face and another camera with sight line
bias to the laser face, respectively. Volumes of the slopes surrounded by a white frame in a, b are
the same
5.3.3 Assessment of the MX-2010-G Topography Meter
All results seem rational and reliable. The MX-2010-G topography meter could
quantitatively interpret the process of mass movement on the steep loess slope under
rainfall simulation. The ability to capture cubic centimeter accuracy data at high
resolution and the synchronous capability afforded by the topography meter, make
the topography meter the ideal tool for quantitative mapping of soil erosion. During
the period of the experiment, the movable laboratory had stood the test of severe
weather, of which rainfall in 24 h was more than 100 mm and wind force was over 10
grades. Compared with the indoor laboratory, a similar observation environment has
been created in our mobile laboratory on the loess slope. In other words, in our mobile
laboratory, measurement accuracies of artificial simulation rainfall, gravity erosion,
runoff, and sediment yield have reached the level of those in laboratory, so that the
obtained results can be compared with earlier published gravity erosion results of the
indoor laboratory. No analogous approach has been found in the existing literature to
date. The measurement system was used to complete the survey for over 130 rainfall
simulation events; it confirmed the feasibility and reliability of this technique.
The video image stored in the memory of the computer is an excellent reference to
deeply analyze the slope behavior and interactivity between images and measurement
results—this can be done only by “clicking” onto the image of the object shown on the
screen of the notebook. Alternatively, because the slope behavior had been recorded
in the video image, data could be stored in computer memory, and landform could be
monitored in either a static mode or a kinematic mode. Not only the positions were
computed, but also the image of the ground was generated. Moreover, the recorded
image was especially pivotal to the gravity erosion. The proposed topography meter
had the advantage that the map could be checked in progress for omissions and
reliability.
The topography meter was a rugged instrument, comparatively easy to operate, and
could be conveniently adjusted in the field. In the fieldwork, an electricity generator
was used to provide a constant power supply to the equipment.
5 How to Conduct an Experiment in the Field …
Fig. 5.9 A slope observed in the cameras from different directions. a, b show the images captured
from the camera with sight line perpendicular to the laser face and another camera with sight line
bias to the laser face, respectively. Volumes of the slopes surrounded by a white frame in a, b are
the same
5.3.3 Assessment of the MX-2010-G Topography Meter
All results seem rational and reliable. The MX-2010-G topography meter could
quantitatively interpret the process of mass movement on the steep loess slope under
rainfall simulation. The ability to capture cubic centimeter accuracy data at high
resolution and the synchronous capability afforded by the topography meter, make
the topography meter the ideal tool for quantitative mapping of soil erosion. During
the period of the experiment, the movable laboratory had stood the test of severe
weather, of which rainfall in 24 h was more than 100 mm and wind force was over 10
grades. Compared with the indoor laboratory, a similar observation environment has
been created in our mobile laboratory on the loess slope. In other words, in our mobile
laboratory, measurement accuracies of artificial simulation rainfall, gravity erosion,
runoff, and sediment yield have reached the level of those in laboratory, so that the
obtained results can be compared with earlier published gravity erosion results of the
indoor laboratory. No analogous approach has been found in the existing literature to
date. The measurement system was used to complete the survey for over 130 rainfall
simulation events; it confirmed the feasibility and reliability of this technique.
The video image stored in the memory of the computer is an excellent reference to
deeply analyze the slope behavior and interactivity between images and measurement
results—this can be done only by “clicking” onto the image of the object shown on the
screen of the notebook. Alternatively, because the slope behavior had been recorded
in the video image, data could be stored in computer memory, and landform could be
monitored in either a static mode or a kinematic mode. Not only the positions were
computed, but also the image of the ground was generated. Moreover, the recorded
image was especially pivotal to the gravity erosion. The proposed topography meter
had the advantage that the map could be checked in progress for omissions and
reliability.
The topography meter was a rugged instrument, comparatively easy to operate, and
could be conveniently adjusted in the field. In the fieldwork, an electricity generator
was used to provide a constant power supply to the equipment.