A Rare Earth Element Tracing Method for Water Erosion and Sediment Transport Capacity of Slope Land

Abstract

The invention relates to a rare earth element (RRE) tracing method for the sediment transporting capacity of water erosion in a sloping field. The rare earth element tracing method comprises the steps: arranging an RRE tracing element consumption and a sloping field, and calculating the sediment transporting capacity by applying an REE concentration. According to the RRE tracing method, a response relationship between a sediment runoff and a length of the sloping field on the basis of an RRE method is only established, and the sediment transporting capacity under any hydrodynamic condition can be calculated. According to the RRE tracing method disclosed by the invention, the sediment runoff of any section of the sloping field can be conveniently and rapidly estimated by only arranging different RREs on the sloping field, and the accuracy and the convenience of obtaining sediment runoff data with space distribution characteristics are improved.

Description

technical field [0001] The invention relates to a rare earth element tracing method for water erosion and sand transport capacity of slope land, and relates to the fields of soil erosion, water and soil conservation, and farmland non-point source pollution control. Background technique [0002] There are 359 million mu of sloping farmland in the country, accounting for about 1 / 5 of the 1.8 billion mu of sloping farmland in the country, and 167 million mu of sloping farmland with a slope greater than 15°, accounting for about 47% of the total sloping farmland. During the rainfall process, the runoff quickly collects and develops into rills and shallow ditches. The scouring force is extremely strong, and the kinetic energy of erosion increases sharply. It becomes the source of sediment and the power source of the ditch head, which greatly damages the land resources. Water erosion is very active in slope farmland in loess region, black soil region, purple soil region, central E...

AI Technical Summary

Problems solved by technology

When using the traditional method to calculate the model parameters, due to the lack of methods to obtain the temporal and spatial distribution data of sediment, the sediment load measured at the outlet of the ditch is often used as the average erosion amount of the entire ditch section. After the calculated parameters are input into the equation, the simulation The error between the result and the actual is large, which cannot reflect the spatio-temporal distribution of the erosion process

Due to the limitations of test methods and calculation methods, it is not yet possible to directly measure and calculate the sediment transport capacity through experiments. In the actual use process, it is necessary to correct it according to the weighted average value of the sand transport capacity of different soil particle sizes, and different particle sizes There is a difference in Tc between

Due to the lack of a reasonable calculation method, when there is a difference between the simulated value and the measured value, it is difficult to distinguish whether the error comes from the model itself or the wrong parameter selection, which limits the application of the model in erosion forecasting

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