Geoscience Reference
In-Depth Information
topographic conditions. Findell and Eltahm
1
analyzed direct observations
on soil moisture and rainfall and found a significant lag correlation between
soil moisture and rainfall.
The soil moisture content before precipitation is crucial in estimating
rainfall-runoff. In fact, the ability of soil to store water and the rate of
storage depend primarily on the initial soil moisture itself and thus on the
previous evaporation and drainage.
2
This study has been prepared as a part of wider research carried out
over recent years in order to assess water resources in Leizhou Peninsula,
the tropic region of China. As, in this region, aquifers provide the principal
water supply, one of the significant problems was to evaluate rainfall as
the only source of groundwater recharge and to research the mechanism of
aquifer replenishment. Therefore, the objective of this study was to examine
(1) response of soil water responding to rainfall in the red soil; (2) the
long term variations of water table by considering recharge processes of
precipitation to groundwater; and (3) the water balance in the study area.
2. Geographical Setting and Methods
Located at the south part of Leizhou Peninsula, Guangdong Province,
China, the hydrological experimental station (110
◦
10
00
E, 20
◦
19
29
N)
has mainly got a warm and humid tropical climate. This typical marine
monsoon weather features a rainy season from April to September with
frequent typhoons (Fig. 1). It has a rich average rainfall of 1,200-1,800 mm
annually with 80%-90% falling during the rainy season. Geologically, old
Fig. 1.
Average precipitation in the study area (1957-2002).
