DOI: 10.5194/hess-18-4617-2014
Scopus记录号: 2-s2.0-84912553070
论文题名: Evolution of karst conduit networks in transition from pressurized flow to free-surface flow
作者: Perne M ; , Covington M ; , Gabrovšek F
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2014
卷: 18, 期: 11 起始页码: 4617
结束页码: 4633
语种: 英语
Scopus关键词: Environmental Protection Agency
; Flow patterns
; Groundwater
; Open channel flow
; Solute transport
; Water levels
; Water management
; Conduit networks
; Free-surface flow
; Hydraulic heads
; Pressurized flow
; Rectangular grids
; Saint Venant equation
; Storm water management model
; US Environmental Protection Agency
; Inlet flow
; dissolution
; drawdown
; flow modeling
; flow pattern
; free surface flow
; karst hydrology
; open channel flow
; outflow
; recharge
; solute transport
; speleology
; vadose zone
英文摘要: Most of the existing models of speleogenesis are limited to situations where flow in all conduits is pressurized. The feedback between the distribution of hydraulic head and growth of new solution conduits determines the geometry of the resulting conduit network. We present a novel modeling approach that allows a transition from pressurized (pipe) flow to a free-surface (open-channel) flow in evolving discrete conduit networks. It calculates flow, solute transport and dissolution enlargement within each time step and steps through time until a stable flow pattern is established. The flow in each time step is calculated by calling the US Environmental Protection Agency Storm Water Management Model (US Environmental Protection Agency, 2014), which efficiently solves the 1-D Saint-Venant equations in a network of conduits. Two basic scenarios are modeled, a low-dip scenario and a high-dip scenario. In the low-dip scenario a slightly inclined plane is populated with a rectangular grid of solution conduits. The recharge is distributed to randomly selected junctions. The results for the pressurized flow regime resemble those of the existing models. When the network becomes vadose, a stable flow pathway develops along a system of conduits that occupy the lowest positions at their inlet junctions. This depends on the initial diameter and inlet position of a conduit, its total incision in a pressurized regime and its alignment relative to the dip of the plane, which plays important role during the vadose entrenchment. In the high-dip scenario a sub-vertical network with recharge on the top and outflow on the side is modeled. It is used to demonstrate the vertical development of karst due to drawdown of the water table, development of invasion vadose caves during vadose flow diversion and to demonstrate the potential importance of deeply penetrating conductive structures. © 2014 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/78072
Appears in Collections: 气候变化事实与影响
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作者单位: Karst Research Institute, Research Centre, Slovenian Academy of Sciences and Arts, Postojna, Slovenia; Josef Stefan Institute, Ljubljana, Slovenia; Department of Geosciences, University of Arkansas, Fayetteville, AR, United States
Recommended Citation:
Perne M,, Covington M,, Gabrovšek F. Evolution of karst conduit networks in transition from pressurized flow to free-surface flow[J]. Hydrology and Earth System Sciences,2014-01-01,18(11)