Surface runoff rate measuring and separating flow sampling device

Abstract

The invention discloses a surface runoff rate measuring and separating flow sampling device. The device comprises a sand settling pipe, a U-shaped guide pipe, a water meter, a separating flow sampling chamber and a runoff collection box, wherein the sand settling pipe is provided with a water outlet; a water level positioning pipe is arranged at the water outlet and is communicated with one side of the U-shaped guide pipe; the water meter is arranged on one side of the U-shaped guide pipe; the other side of the U-shaped guide pipe is communicated with the separating flow sampling chamber; the runoff collection box is provided with a water inlet; the water inlet is communicated with the bottom of the separating flow sampling chamber. Runoff in the sand settling pipe is led into the separating flow sampling chamber for flow separation by using the U-shaped guide pipe, so stable flow separation is realized under the condition that the sampling water quantity is greatly reduced, the flow is accurately recorded, the accuracy for sampling is kept, the floor area is small, the building is easy, the engineering is small, the cleaning and maintenance are easy, and the service life is long. The surface runoff rate measuring and separating flow sampling device can be widely applied to the field of agricultural environments.

Description

technical field [0001] The invention relates to the field of agricultural environment, in particular to a surface runoff flow measurement and diversion sampling device. Background technique [0002] Non-point source pollution from agricultural fertilizers is becoming a major concern of both developed and developing countries in the world, and has gradually become a major issue of modern agriculture and sustainable development of society. Since the 1980s, the amount of fertilization in the Dianchi Lake, the Five Great Lakes, and the Three Gorges Reservoir has increased significantly, with an average of 368 kg and 154 kg in 2000 and 2001, which are 2 to 4 times the national average level (183 kg and 54 kg) in the same period. . The investigation of more than 20 kinds of crops in 31 provinces shows that the average amount of nitrogen fertilizer pure nutrient consumption of a single crop in vegetable and fruit flower farmland is 569-2 000 kg ha -1 , which is several times or e...

AI Technical Summary

Problems solved by technology

However, there are three shortcomings in the actual application process: (1) The volume of the runoff pool needs to be determined according to the maximum runoff that can be generated in the test area, so the volume of the runoff pool needs to be designed to be large enough, which makes the construction project occupy a large area; (2) ) The area of ​​the runoff pool is large, and the operation process such as pumping and cleaning the runoff pool is time-consuming and labor-intensive, and the operation is inconvenient; (3) Especially in the southern region with heavy rainfall and shallow groundwater level, after long-term operation of the runoff pool, leakage is prone to occur, making the runoff pool Gray water loses representation

Images