scholarly journals The Role of Frozen Soil in Groundwater Discharge Predictions for Warming Alpine Watersheds

2018 ◽  
Vol 54 (3) ◽  
pp. 1599-1615 ◽  
Author(s):  
Sarah G. Evans ◽  
Shemin Ge ◽  
Clifford I. Voss ◽  
Noah P. Molotch
Keyword(s):  
Groundwater Discharge ◽  
Frozen Soil ◽  
Alpine Watersheds

scholarly journals The role of groundwater discharge fluxes on Si:P ratios in a major tributary to Lake Erie

2018 ◽  
Vol 622-623 ◽  
pp. 814-824 ◽  
Author(s):  
Taylor Maavara ◽  
Stephanie Slowinski ◽  
Fereidoun Rezanezhad ◽  
Kimberly Van Meter ◽  
Philippe Van Cappellen
Keyword(s):  
Lake Erie ◽  
Groundwater Discharge ◽  
Major Tributary

scholarly journals Assessing the role of submarine groundwater discharge as a source of Sr to the Mediterranean Sea

2017 ◽  
Vol 200 ◽  
pp. 42-54 ◽  
Author(s):  
Giada Trezzi ◽  
Jordi Garcia-Orellana ◽  
Valentí Rodellas ◽  
Pere Masqué ◽  
Ester Garcia-Solsona ◽  
...  
Keyword(s):  
Mediterranean Sea ◽  
Submarine Groundwater Discharge ◽  
Groundwater Discharge ◽  
Submarine Groundwater ◽  
The Mediterranean

scholarly journals How vadose zone mass and energy transfer physics affects the ecohydrological dynamics of a Tibetan meadow?

2020 ◽  
Author(s):  
Lianyu Yu ◽  
Yijian Zeng ◽  
Simone Fatichi ◽  
Zhongbo Su
Keyword(s):  
Vadose Zone ◽  
Land Surface ◽  
Ecosystem Functioning ◽  
Vegetation Dynamics ◽  
Process Model ◽  
Environmental Changes ◽  
Model Performance ◽  
Frozen Soil ◽  
The Tibetan Plateau

Abstract. The vadose zone is a sensitive region to environmental changes and exerts a crucial control in ecosystem functioning. While the way in representing the underlying process of vadose zone differs among models, the effect of such differences on ecosystem functioning is seldomly reported. Here, the detailed vadose zone process model STEMMUS was coupled with the ecohydrological model T&C to investigate the role of solving influential physical processes, considering different soil water and heat transfer parameterizations including frozen soils. We tested model performance with the aid of a comprehensive observation dataset collected at a typical meadow ecosystem on the Tibetan Plateau. Results indicated that: i) explicitly considering the frozen soil process significantly improved the soil moisture/temperature (SM/ST) profile simulations and facilitated our understanding of the water transfer processes within the soil-plant-atmosphere continuum; ii) the difference among various complexity of vadose zone physics have an impact on the vegetation dynamics mainly at the beginning of the growing season; iii) models with different vadose zone physics can predict similar interannual vegetation dynamics, and energy, water and carbon exchanges at the land-surface. This research highlights the role of vadose zone models and their underlying physics, in ecosystem functioning and can guide the development and applications of future earth system models.

Estimating groundwater discharge to surface waters using heat as a tracer in low flux environments: the role of thermal conductivity

2015 ◽  
Vol 30 (3) ◽  
pp. 383-395 ◽  
Author(s):  
Carlos Duque ◽  
Sascha Müller ◽  
Eva Sebok ◽  
Kinza Haider ◽  
Peter Engesgaard
Keyword(s):  
Thermal Conductivity ◽  
Surface Waters ◽  
Groundwater Discharge ◽  
Heat As A Tracer

scholarly journals The influence of hyporheic fluxes on regional groundwater discharge zones

2021 ◽  
Author(s):  
Brian Babak Mojarrad ◽  
Anders Wörman ◽  
Joakim Riml ◽  
Shulan Xu
Keyword(s):  
Groundwater Modeling ◽  
Groundwater Discharge ◽  
Water Fluxes ◽  
Flow Paths ◽  
Spectral Solution ◽  
Scale Modeling ◽  
Naturally Occurring ◽  
Boreal Landscape ◽  
Regional Groundwater

Abstract. The importance of hyporheic water fluxes induced by hydromorphologic processes at the streambed scale and their consequential effects on stream ecohydrology have recently received much attention. However, the role of hyporheic water fluxes in regional groundwater discharge is still not entirely understood. Streambed-induced flows not only affect mass and heat transport in streams but are also important for the retention of solute contamination originating from deep in the subsurface, such as naturally occurring solutes as well as leakage from the future geological disposal of nuclear waste. Here, we applied a multiscale modeling approach to investigate the effect of hyporheic fluxes on regional groundwater discharge in the Krycklan catchment, located in a boreal landscape in Sweden. Regional groundwater modeling was conducted using COMSOL Multiphysics constrained by observed or modeled representations of the catchment infiltration and geological properties, reflecting heterogeneities within the subsurface domain. Furthermore, streambed-scale modeling was performed using an exact spectral solution of the hydraulic head applicable to streaming water over a fluctuating streambed topography. By comparing the flow fields of watershed-scale groundwater discharge with and without consideration of streambed-induced hyporheic flows, we found that the flow trajectories and the distribution of the travel times of groundwater were substantially influenced by the presence of hyporheic fluxes near the streambed surface. One implication of hyporheic flows is that the groundwater flow paths contract near the streambed interface, thus fragmenting the coherent areas of groundwater upwelling and resulting in narrow “pinholes” of groundwater discharge points.

Bedrock outcrops: A window for enhanced midwinter recharge

2021 ◽  
Author(s):  
Stephanie Wright ◽  
Kent Novakowski
Keyword(s):  
Moisture Content ◽  
Element Model ◽  
Frozen Soil ◽  
Climate Data ◽  
Soil Permeability ◽  
Time Step ◽  
Near Surface ◽  
Flow Transport ◽  
Winter Time

<p>As midwinter melt and rain-on-snow events become more common occurrences in the northern hemisphere under climate change, incorporating frozen processes when simulating winter-time recharge is increasingly necessary. The activation of infiltration pathways and recharge dynamics of shallow bedrock environments under frozen conditions has received relatively little attention. Over the 2019-2020 winter, hydrogeologic and cryospheric conditions of the surface, unsaturated, and saturated zones were monitored around a low-lying granitic outcrop in eastern Ontario, Canada. Interpretation of the data indicated that the soil-rock contact around outcrop margins was the key pathway enabling midwinter infiltration and recharge. To support this conceptual model and further explore the role of outcrops in enhancing midwinter bedrock recharge, a numerical investigation was undertaken. Measured climate data (hourly time step) was used to govern the surface energy and water balances of a 1D finite difference model that incorporates frozen processes. Measured snow depth, soil moisture content, and soil temperature profiles were simulated. Simulations with vertical infiltration alone could not account for observed increases in moisture content in the deepest soil horizons. This is attributed to additional lateral flow along the unfrozen soil-rock contact that bypasses the frozen soil layers. Preliminary results support the concept that bedrock outcrops provide a window for midwinter infiltration since repeated winter melts reduce frozen soil permeability and inhibits vertical infiltration until the ground thaws. Results from the surface/near-surface simulations are used to guide the development of a 2D finite element model that includes heat and flow transport and ground freeze-thaw. The impacts to bedrock recharge under different rainfall and snowmelt scenarios as well as various outcrop geometries are explored. Results from these numerical experiments help provide greater insight into the processes driving enhanced midwinter bedrock recharge under conditions of warmer winters.</p>

Sign in / Sign up

Export Citation Format

Share Document