System and method for automatically determining phreatic evaporation

Abstract

The invention discloses a system for automatically determining phreatic evaporation and an implementation method thereof. According to the structure, the system comprises a support and a weighing sensor which is hoisted on the support, wherein a group of earth-pillars which are arranged in a leaching-pond in a suspended manner are arranged under the weighing sensor in a cable-stayed manner; the lower parts of the earth-pillars are soaked in the underground water at the bottom of the leaching pond; a water level sensor is arranged at each of the bottom end inside the leaching pond and the bottom end inside each earth-pillar; the electromagnetic valve which communicates the inside and outside of the earth-pillars is arranged on the side wall of each earth-pillar; the calculation formula of the phreatic evaporation E is that E equals to delta G and delta F, and equals to the sum of (G start-G end) and (F start-F end). The system can be used for solving the problem that the water level change of surrounding underground cannot be considered in observation by a lysimeter and avoiding influence of horizontal discharge or nearby pumping on the phreatic evaporation, so that the quantity of phreatic evaporation of different crops in different periods can be efficiently and automatically determined.

Description

technical field [0001] The invention relates to the technical field of ecological environment monitoring, in particular to an automatic system and method for submersible evaporation measurement. Background technique [0002] Groundwater is the subject of soil physics, hydrogeology, farmland water conservancy, surface hydrology, and water resources. Over the years, scholars in these fields have conducted a lot of research on it. The mechanism and law of "submarine evaporation" is one of the focus of their research. one. [0003] Submarine evaporation refers to the evaporation of shallow groundwater. Part of the groundwater enters the atmosphere through soil evaporation through the action of soil capillaries; the other part enters the atmosphere through transpiration of plants. [0004] The main factors affecting phreatic evaporation are climatic factors, soil, buried depth and vegetation conditions. When the temperature is high, the wind speed is high and the humidity is lo...

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome various deficiencies in the prior art, provide an automatic measurement system for submerged evaporation and its implementation method, which can solve the problem that the surrounding groundwater level cann

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