Dynamics of the interface between streams and groundwater systems in lowland areas, with reference to stream net evolution
Dynamics of the interface between streams and groundwater systems in lowland areas, with reference to stream net evolution
复制标题
低地地区溪流与地下水系统界面的动态，参考溪流网演化
DOI：
10.1016/0022-1694(94)90157-0
复制
发表时间：
1994
影响因子：
6.4
通讯作者：
J. J. Vries
中科院分区：
文献类型：
--
作者：
J. J. Vries
观察揭示了荷兰更新世桑迪地区渗透性低地的地下水深度与溪流网络特征之间的密切关系。这适用于平均条件以及参与排水过程的河流网络的季节性扩张和收缩。这是合理的，这种观察到的关系是由地下水和地表水之间的密切联系，在一个地区，几乎所有的降水盈余作为地下水排放。在这种情况下，河流系统可以被认为是地下水流系统的露头。本文提出了一个地下沃茨-地表水耦合排水系统的理论模型，给出了河流净密度和河道尺度随地质和气候条件变化的函数关系。从理论上推导出的河流密度增加、河道尺寸减小与地下水深度减小和地形坡度减小的关系反映了观察到的情况。该模型还允许评估排水网络对不断变化的环境的响应。
Observations reveal a close relationship between groundwater depth and stream net characteristics in the permeable lowlands of the sandy Pleistocene area of the Netherlands. This applies for average conditions as well as for the seasonal expansion and contraction of the network of streams that participate in the drainage process. It is plausible that this observed relation is caused by the close connection between groundwater and surface water in an area where almost all precipitation surplus is discharged as groundwater. Under such conditions a stream system can be considered the outcrop of a groundwater flow system. The hypothesis is that the stream network, as the interface between both systems, must have adapted in response to the discharge capacity that is required to release the precipitation surplus through the continuum of ground waters and surface waters.A theoretical model of coupled groundwater and surface water drainage systems is proposed that gives the stream net density and channel dimensions as functions of the geological and climatic conditions. The theoretically derived relationships of increasing stream density and decreasing channel size with reducing depth to groundwater and reducing topgraphic slope reflect the observed situation. The model further allows for assessment of the response of a drainage network to a changing environment.