Hydrograph of Barme-Jamal spring, 2003–2011

Hydrograph of Barme-Jamal spring, 2003–2011

Source publication
Article
Full-text available
Karstic aquifers are important groundwater reservoirs that supply water to many communities in different countries, such as Iran. Therefore, studying the discharge volume and its fluctuations in addition to identify the hydraulic behavior of the karstic springs is very important. This knowledge can be realized by monitoring and analyzing of spring...

Citations

... Given the limited drainage capacity of the conduit, water levels increase rapidly, reaching levels higher than those in fissures, which would drive the conduit-borne solutes both in the unsaturated and saturated zone flowing into the surrounding fissures for storage. When the rainfall ceases, the conduit's hydraulic head diminishes due to the recharge recession and becomes inverted, thereby mobilizing the groundwater stored in fissures, pushing the stored solutes from fissures into conduits ( Fig. 2b) Faulkner et al., 2009;Kalantari and Rouhi, 2019;Li et al., 2008;Shirafkan et al., 2021). ...
Article
The contaminant transport processes in karst water systems have a direct impact on the quality and utilization of karst water resources. The storage and release of contaminants or conservative solutes during the solute transport process is a common phenomenon in karst aquifers. The impact of the storage and release is more prevalent after focused recharge events. In this study, laboratory experimental and numerical studies were conducted to quantify the storage and release processes of conservative solute. The results showed that, conduit water recharges into fissures under high water head conditions, and the fissure water drains back into the conduit while the hydraulic gradient reverse. The conservative solute storage-release process controlled by hydrodynamic conditions produces strong asymmetry, long tailing, or bi-peak in the breakthrough curves (BTCs). The BTCs change from single peak to bi-peak with enhanced hydrodynamics under focused recharge conditions. The dual heterogeneous domain model was calibrated to simulate the long-tailing of the BTCs and their noticeably bimodal characteristics. The flow velocity and dispersion coefficient are the major variables that regulate the bimodal structure of the BTCs, which also control the solute storage-release differences between the conduit and fissures. The bimodal structure of the BTCs becomes more pronounced for large discrepancies in flow velocities. The total BTCs are a superposition of solute transport in the conduit path and storage-release path. A method to evaluate the mass of conservative solute transport in storage-release paths was proposed by segmenting the transport curve in the conduit from the total BTCs, thus quantifying the effects of the groundwater storage-release mechanism on the solute transport process in the karst water system.
... This is due to the expansion of the cone of the depression of the spring to the lateral noflow boundaries. The increase of the slope of the recession curve during the late time (long time after the end of the recharge period) is also reported in some case studies (Bagheri et al., 2016;Kalantari and Rouhi, 2019;Lauber et al., 2014;Nassery et al., 2014) and is called convex recession. Schmidt et al. (2014) modeled the convex recession considering a mature Karstic aquifer with well-developed conduit flow. ...
Article
Springs are important source of fresh water for many regions of the world. Most mathematical models simulating spring discharge are linear and non-linear reservoir-based models that are simple and easy to use. They, however, suffer from oversimplification and a lack of physical processes that limit their applicability. The goal of this work is to present process-based analytical model of discharge variation of multiple springs associated with a rectangular fractured aquifer subjected to arbitrary recharge. The solution is obtained via Laplace and Fourier transformations along with the superposition principle and image well method for a constant flux point sink. Then the constant head point sink solution representing a single spring is obtained from the constant flux point sink solution. Finally, the constant head point sink solution is extended to simulate the multiple constant head sinks (or springs) utilizing the principle of superposition and matrix solution. The solution considers the vertical anisotropy of fractures, the inter-porosity flow between fractures and matrix blocks and the instantaneous gravity drainage of the water table. The results of this study are presented in the form of dimensionless discharge-time curve and dimensionless spring depletion volume-time curves. The influences of aquifer geometric and hydraulic parameters on spring discharge variation are explored. The presented model can be utilized to simulate the discharge variation of multiple springs depleting a fractured aquifer, to estimate the hydraulic parameters of the aquifer utilizing the discharge data of springs, and to evaluate the dynamic storage volume of multiple springs depleting a fractured aquifer, among other applications.