Lake replenishment water source tracing method utilizing hydrogen and oxygen isotopes

Abstract

The invention discloses a lake replenishment water source tracing method using hydrogen and oxygen isotopes. The method mainly comprises the following steps of: collecting a lake water sample; measuring the abundance of the hydrogen and oxygen isotopes (2H, 18O) of the lake water; obtaining the air temperature, relative humidity, daily precipitation and evaporation data of a region where a lake islocated; constructing the atmospheric precipitation line of the research region; calculating the theoretical value of the abundance of the hydrogen and oxygen isotope under an evaporation balance andlimit state at each moment; constructing a lake dynamic evaporation process line; reducing the abundance of the hydrogen and oxygen isotopes of the water quantity of the lake under the condition thatthe water quantity of the lake is not subjected to an evaporation isotope fractionation stage; calculating the proportion of the lake evaporation capacity in inflow in each time period; using a lakewater quantity and isotope mass conservation equation to finely segment the water quantity and isotope abundance of a lake replenishment water source and consumption evaporation items in each time period so as to obtain a lake inflow water quantity Ri and a corresponding isotope abundance change-along-with-time process line; and comprehensively analyzing the change condition of the lake inflow water source.

Description

technical field [0001] The invention belongs to the field of hydrological measurement, and in particular relates to a technical method for determining lake replenishment water sources based on isotope tracing technology. Background technique [0002] The cutting-edge research in the field of physical chemistry believes that the physical information of the water body is closely related to the chemical characteristics of the water body itself. Furthermore, on the basis of a macroscopic understanding of how physical and natural laws determine or affect the chemical information of water bodies, by monitoring the chemical signal changes of water bodies and constructing a reasonable mathematical model, the physical form of water bodies can be effectively reversed. [0003] Hydrogen and oxygen isotopes are known to be used ( 18 O, 2 H) mass conservation model to quantitatively evaluate lake evaporation and inflow methods. For example, patent CN 109598082 A discloses calculation m...

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Problems solved by technology

However, this method is too generalized and assumes that the water level of the lake is constant, and the results obtained are the average results based on several isotope test results, so it is difficult to correctly reflect the dynamic changes of the lake's recharge, and it cannot be objective and comprehensive. Show the time-scale change characteristics of lake water volume; secondly, for example, the method of patent CN106370802A can use hydrogen and oxygen isotopes to restore the water inflow and outflow of lakes, but cannot distinguish the water source components. The result of quantitative calculation is the sum of the recharge of all lakes, and It cannot distinguish the complex components involved in precipitation, snowfall, snowmelt runoff, surface runoff, underground runoff, etc., thus limiting the application of this technical method

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