Farmland runoff monitoring device suitable for paddy fields and dry lands

Abstract

The invention discloses a farmland runoff monitoring device simultaneously suitable for dry land and paddy fields. The device comprises a water inlet, a grit chamber, a steady flow plate, a triangularweir, a float-type water level sensor and a water outlet. A movable sampling frame is arranged in the grit chamber; farmland drainage settles silt through the grit chamber and stably enters a triangular weir for flow measurement through a steady flow plate; the float-type water level sensor is communicated through a hole in the right side of the weir trough, the float in the instrument rises andfalls along with the fluctuation of the water level, the water level change in the triangular weir is measured, and water level data is transmitted to automatic sampling equipment to calculate the weir flow; when the water level exceeds the height of the weir crest of the triangular weir, sampling is triggered so as to compare changes of runoff pollutant concentrations generated in different stages. By utilizing the agricultural non-point source pollution runoff monitoring device, the problems of small agricultural non-point source pollution runoff flow, much silt and difficulty in accurate measurement can be solved, and a reliable basis is provided for agricultural non-point source pollution control and ecological environment protection.

Description

technical field [0001] The invention belongs to the field of agricultural non-point source pollution monitoring, and relates to a farmland runoff monitoring device for monitoring the impact of farmland runoff on the water environment, in particular to a farmland runoff monitoring device suitable for paddy fields and dry lands. Background technique [0002] Agricultural non-point source pollution is random and intermittent. Due to differences in industrial layout, production mode, river network dynamics, and hydrological soil in different regions, the pollution load in space and time is variable, and it is difficult to control. important factor. Due to the fact that the occurrence of farmland drainage is closely related to rainfall, and its occurrence is relatively random and hidden. In addition to the initial scour effect and other factors, the discharge concentration of pollutants such as nitrogen and phosphorus in farmland varies greatly (usually the concentration is high ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the invention is to: overcome the deficiencies of the prior art (solve the problems of many disturbance factors in the field environment and small runoff flow in the dry land existing in the prior art), and provide a method suitable for actual observation and quantitative analysis in the field for a long time. The relationship between surface runoff and nitrogen and phosphorus content is suitable for farmland runoff monitoring devices in paddy fields and dry lands, in order to achieve the purpose of accurate measurement of water flow in paddy fields and dry land surface runoffs

Images