A new model for simulating spring discharge recession and estimating effective porosity of karst aquifers
A new model for simulating spring discharge recession and estimating effective porosity of karst aquifers
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DOI：
10.1016/j.jhydrol.2018.05.039
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发表时间：
2018-07
影响因子：
6.4
通讯作者：
Bin Xu;M. Ye;Shuning Dong;Z. Dai;Yongzhen Pei
中科院分区：
文献类型：
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作者：
Bin Xu;M. Ye;Shuning Dong;Z. Dai;Yongzhen Pei
岩溶泉水位线退水曲线的定量分析是了解岩溶水文、推断岩溶含水层水力特性的重要手段。本文提出了一种新的岩溶泉退水曲线模拟模型。新模型具有以下特点：（1）模型考虑了两个相互独立但在水力上相互连通的水库：基质水库和管道水库;（2）模型将岩溶泉过程线退水分为三个阶段：排渗阶段、混合排水阶段（导管排水和基质排水）和基质排水阶段;在混合排水阶段，模型采用多个管道层来表示管道的不同发育程度。新模型优于经典的Mangin模型和最近开发的Fiorillo模型模拟观测到的流量在麦迪逊蓝泉位于北方佛罗里达。这归因于新模式的后两个特征。在此基础上，提出了一种计算三个泄油阶段基质储层和导管储层有效孔隙度的方法。估计的孔隙度值与研究现场测量的基质孔隙度和文献中报告的估计导管孔隙度一致。新的模型用于模拟岩溶泉过程线衰退是数学上通用的，并且可以应用于广泛的岩溶泉过程线，以了解岩溶含水层中的地下水流。最后对该模型的局限性进行了讨论。
Quantitative analysis of recession curves of karst spring hydrographs is a vital tool for understanding karst hydrology and inferring hydraulic properties of karst aquifers. This paper presents a new model for simulating karst spring recession curves. The new model has the following characteristics: (1) the model considers two separate but hydraulically connected reservoirs: matrix reservoir and conduit reservoir; (2) the model separates karst spring hydrograph recession into three stages: conduit-drainage stage, mixed-drainage stage (with both conduit drainage and matrix drainage), and matrix-drainage stage; and (3) in the mixed-drainage stage, the model uses multiple conduit layers to present different levels of conduit development. The new model outperforms the classical Mangin model and the recently developed Fiorillo model for simulating observed discharge at the Madison Blue Spring located in northern Florida. This is attributed to the latter two characteristics of the new model. Based on the new model, a method is developed for estimating effective porosity of the matrix and conduit reservoirs for the three drainage stages. The estimated porosity values are consistent with measured matrix porosity at the study site and with estimated conduit porosity reported in literature. The new model for simulating karst spring hydrograph recession is mathematically general, and can be applied to a wide range of karst spring hydrographs to understand groundwater flow in karst aquifers. The limitations of the model are discussed at the end of this paper.