关键词: GIS, 地下水位, 时空变化, 河北平原

Abstract: Based on the data of the depth to groundwater table below land surface with observational wells in 1975, 1980, 1985, 1990, 1995, 2000 of the Hebei Plain, adopting GIS technic and Kriging interpolation method, this paper analyzes the spatio-temporal change of groundwater level in the past 25 years in Hebei Plain. The depth to shallow groundwater table below land surface has fallen 10.2m during 1975--2000 and the annual average decline of groundwater table was 0.41m. The annual average decline rate of groundwater table during 1980--1985 and 1990--1995 was the largest, with 0.7m/a and 0.74m/a respectively. The depth to deep groundwater table below land surface has fallen 30.2m in the past 25 years and the annual average decline of groundwater table was 1.21m. The annual average decline rate during 1980--1985 was the largest, with 1.83m/a. The shallow groundwater table and the decline rate decrease from the Piedmont Plain to the Coastal Plain, while the deep groundwater level and decline rate increase from the Piedmont Plain to the Coastal Plain. The decrease of precipitation and surface water and over-exploitation are the main reasons that result in groundwater level decline.

Key words: GIS, groundwater level, spatio-temporal change, the Hebei Plain