The property of precipitation and dynamics variation of shallow groundwater level in the saline and water deficit region, North China Plain, were discussed in this paper by taking Nanpi Testing Area as a case study. The annual precipitation concentrates in a few of rainstorm process within the monsoon climate region. The shallow groundwater is recharged mainly by the permeated runoff of rainstorm. So the resuming extent of groundwater level can express the active water resource status. The average annual precipitation from 1965 to 2001 was 5457mm. Simple statistics revealed that there was a linear relationship between the groundwater level and the annual rainfall amount. The correlation coefficient was 06317 and 04249 in the two periods of 1980~1989 and 1995~2001 respectively. The biggest annual fluctuation amount of the groundwater level was 41m, and season resuming amount was among 19~38m. According to the results measured by artificial rainfall, there was no runoff in grassland when it rained continually with 569mm of the total water amount. The runoff coefficient was 013 when it rained continually with 1143mm of the total water amount at 106mm/min of the raining intensity. But the coefficient was 021 for bare farmland at alike raining intensity. The resuming amounts of groundwater level were 141~397m in the Nanpi Testing Area when a heavy rainstorm with 252mm water amount occurred in July 13, 1997. The Grey Dynamic Model results show that the shallow groundwater level will be declining gradually in the future based on the water supplying, water utilization and water geo hydrological condition at present. The decline ratio is about 012~014m/y. It is difficult to keep the water balance only with the recharge of rainfall. Therefore it is emphasized to take the comprehensive water saving measures and to regulate the runoff of many years as well as to introduce water from outside watersheds etc. in order to prevent the water environment deterioration of the area.
MAO Ren zhao, LIU Xiao jing, LOU Hua jun
. A Study on the Dynamic Variation of Shallow Groundwater Table in the Saline and Water Deficit Region in North China Plain[J]. PROGRESS IN GEOGRAPHY, 2002
, 21(6)
: 561
-572
.
DOI: 10.11820/dlkxjz.2002.06.006
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