Abstract:

In order to develop groundwater resources and the regional economic of Jingzhou area more reasonably, according to the continuous monitoring data of 36 groundwater level observation wells and 30 groundwater quality monitoring wells in Jingzhou region from 2008 to 2011, combined with groundwater rechargerunoffdischarge conditions, this paper analyzed the spatiotemporal variation characteristics and influencing factors of upper pore confined water level and quality in study area. The results showed as follows. (1) Groundwater level dynamics in Jingzhou City can be divided into natural dynamic type and artificial dynamic type. Different types of groundwater level dynamic law have significant differences in temporal and spatial distribution. These differences present the characteristics of periodicity, synchronization and particularity. Because of a certain variability to the average groundwater level, it is difficult to identify and forecast groundwater level sequence regularity for the over years. The groundwater level of 4167%-50% monitoring holes is in stable state, while 2222%-3611% declines more than 02 m, 1944%-3611% rises more than 02 m. Meanwhile,from the analysis of groundwater level variation characteristics in the south of Jingzhou concentrated pumping area and the Jing cottonSand cotton concentrated pumping area from the year 2008 to 2011, landing funnel area of the former is between 415-517 km2, the average water level buried depth of funnel center is between 663-778 m, while landing funnel area of the latter is between 1335-2047 km2 and belongs to the seasonal landing funnel, the average water level buried depth of funnel center is between 661-816 m . Weather and artificial exploitation are the main factors causing the present groundwater level regime. (2) Groundwater quality is not optimistic, and the overall is in poor condition. Indexes over standard for four consecutive years are total hardness, nitrite, ammonia nitrogen, arsenic, iron, manganese and soluble solid content. The above indexes are exceeding standard anomaly in part of the monitoring points. The shallow groundwater quality pollution type caused mainly by industrial pollution transformed gradually into diverse types of industrial, agriculture and lake drugs pollution. Over standard of iron, manganese, arsenic has a close relationship with the primary geological environmental conditions in Jianghan plain, but over standard of the other indexes is affected by human economic activities to a great extent such as the widespread use of fertilizers, pesticide pollution and domestic wastewater.