Relationship between urban heat island effect and shallow groundwater:a case study of Xuchang City
Through the study of Landsat series images in the survey area,it is found that the impact area of the heat island effect in Xuchang City increases with the continuous expansion of urbanization scale,which in turn causes an increase in the near-surface temperature of the city.This work uses hydrogeological survey and other technical methods to measure the shallow groundwater level and temperature during the dry season in the survey area in 2023.MAPGIS software is applied to analyze and process the shallow groundwater temperature data.The results show,that the shallow groundwater temperature in the urban area is higher than that in the suburbs.Combined with vertical temperature measurement,the burial depth of shallow groundwater determines its degree of influence from the heat island effect.The temperature change of shallow groundwater is inversely proportional to the burial depth,i.e.the shallower the burial,the greater the degree of influence from near-surface temperature.When the burial depth reaches a certain extent,the effect of near-surface temperature changes on the shallow groundwater temperature is negli-gible.The movement of shallow groundwater carries away some of the heat from the near-surface strata.Therefore,raising the shallow groundwater level to some extent alleviates the intensity of the heat island effect.
heat island effectshallow groundwaterXuchang Cityremote sensing image
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