Method of equivalent irrigation and pumping and recycling of geothermal energy for water delivery in ice age

Abstract

The invention discloses a method of equivalent irrigation and pumping and recycling of geothermal energy for water delivery in ice age. Before freezing of open channel water in winter or when the water temperature needs to be increased, part of cold water in the open channel is recharged to an underground aquifer through an irrigation and pumping station, the water temperature is increased by using the geothermal energy, after the temperature is increased, the water in the underground aquifer which is equivalently pumped is mixed with the water in the original open channel, thus the water temperature in the open channel is increased, and it is guaranteed that the water surface of the open channel is not frozen for water delivery. One of the specific embodiments comprises the following processes that a numerical simulation model of geothermal energy water delivery in ice age is established; and the geothermal energy is used for water delivery in ice age. According to groundwater dynamics, under the combined action of a pumping well and an irrigation well, the water recharged to the aquifer moves towards the pumping well, and absorbs the geothermal energy along the way, the temperature is gradually increased until gets to the pumping well. Because the pumping and recharging amount are equal, the groundwater quality can be kept in balance, and the groundwater level is not lowered.

Description

technical field [0001] The invention relates to a method for water delivery during glacial periods by using geothermal energy in an equal-volume irrigation and pumping cycle, and belongs to the technical field of operation and management of water delivery channels during glacial periods. Background technique [0002] Due to the cold winter weather in northern my country, the water delivery channels will be affected by ice damage such as ice slush, ice plug, ice dam, etc., making it difficult for the channel to deliver water during the freezing period, which not only seriously affects the safety of water delivery in the channel, but also aggravates the The shortage of water resources in the region restricts the rapid development of the national economy. At present, the research on water transportation during glacial periods mainly focuses on rivers or large-scale water transportation channel projects, and there are few studies on small and medium-sized channels for glacial wat...

AI Technical Summary

Problems solved by technology

(2) Small and medium-sized channels have small heat storage capacity and are prone to full-section freezing

(3) During the ice age, due to the influence of the resistance of the ice sheet, the water delivery capacity will be greatly reduced (generally 1 / 3 to 1 / 4). According to the principle of hydraulics, the impact on small and medium-sized channels is greater

However, the construction funds of small and medium-sized channels are limited, and it is difficult to meet the requirements

(5) In order to prevent accidents such as ice blockage, the channels for transporting water during the ice age need to strictly control the changes in water level and water volume, and a complete set of water level, flow, and ice condition monitoring systems need to be established, which is difficult for small and medium-sized channels

[0005] However, this method of only pumping but not recharging will cause the local groundwater to continue to decline and groundwater to be over-exploited in plain areas, which in turn will cause serious consequences such as land subsidence and seawater intrusion.

Images