Fifty years of hyporheic zone research have shown the important role played by as an interface between groundwater and surface waters. However, it is only in last two decades that what began empirical science has become a mechanistic devoted to modeling studies complex fluid dynamical biogeochemical mechanisms occurring zone. These efforts led picture surface-subsurface water interactions regulators form function fluvial ecosystems. Rather than being isolated systems, bodies continuously...

A model for the evaluation of intra‐meander hyporheic exchange fluxes is presented. The method relies on a physically‐based morphodynamic to predict characteristics flow field in meandering river and temporal evolution its planimetry. induced at meander scale by sinuosity can therefore be computed. application simulated case has shown fundamental role planimetry pattern scale, influence long‐term exchange.

The dynamics of chemicals within a catchment are strongly affected by the exchange between surface water and groundwater. activity hyporheic microorganisms plays key role in these processes, as they able to oxidize reduce organic matter nutrients. interplay residence times zone temporal scales microbial reactions must thus be understood order improve our understanding fluvial environments nutrient cycling. In this paper we focus on intrameander region investigate links river morphology, flow...

Stream physics set the limits A combination of physical transport processes and biologically mediated reactions in streams their sediments removes dissolved inorganic nitrogen (DIN) from water. Although stream chemistry biology have been considered dominant controls on how quickly DIN is removed, Grant et al. show that what sets removal rates nitrate (a component DIN). Residence time hyporheic zone (the region below sediment surface where groundwater water mix) determines maximum rate at...

Pore water in stream sediments is continuously exchanged with the surface from overlying stream. This exchange of and solutes that occurs across stream‐sediment interface plays an important role for fluvial ecology because unique biochemical conditions, rich biodiversity, high rates metabolism. While many studies have observed extent hyporheic zone to be modified by changes level groundwater table, actual importance this interaction still difficult quantify. Here, we focus on case bedform...

The transport of solutes in rivers is influenced by the exchange water between river and underlying hyporheic zone. residence times zone are typically much longer than traveltimes stream, resulting a significant delay downstream propagation solutes. A new model for this process proposed here on basis continuous time random walk (CTRW) approach. CTRW generalization classic that can include arbitrary distributions waiting times, it particularly suited to deal with long arising from exchange....

Abstract The exchange of water between the surface and subsurface environments plays a crucial role in hydrological, biogeochemical, ecological processes. is driven by local morphology streambed (hyporheic exchange) regional forcing large‐scale hydraulic gradient, which results losing or gaining flow conditions. We measured effects conditions on hyporheic fluxes sandy using novel laboratory flume system (640 cm long 30 wide) under combination average overlying velocities losing/gaining...

Abstract Riverbed sediments host important biogeochemical processes that play a key role in nutrient dynamics. Sedimentary transformations are mediated by bacteria the form of attached biofilms. The influence microbial metabolic activity on hydrochemical conditions within hyporheic zone is poorly understood. We present hydrobiogeochemical model to assess how growth heterotrophic and autotrophic biomass affects transport transformation dissolved nitrogen compounds bed form‐induced zones....

Several geomorphological fluvial features are able to induce hyporheic exchange between the rivers and alluvial sediments. However, while small‐scale induced by bed forms has been thoroughly investigated, role of larger remains poorly understood. Here, we focus on flows driven channel sinuosity in intrameander zone. A physically based model is adopted simulate morphodynamic evolution three different meandering rivers, from first stages meander until incipient cutoff. For each stage,...

Abstract The exchange of oxygen and nutrients between the well‐aerated stream water subsurface is crucial for biochemical conditions hyporheic zone. metabolic activity microorganisms controls fate nitrogen phosphorus in pore water, influences these at catchment scale. Unfortunately, incomplete knowledge complex hydrodynamics coupled surface‐subsurface flow field often hinders understanding ecological relevance processes. Here, we analyse influence groundwater discharge through streambed on...

Aquatic sediment hosts coupled pore water flow and biogeochemical reactions that mediate quality across the fluvial corridor including adjacent alluvial aquifers. However, effect of small‐scale variations in hydraulic properties on nutrient transformation occurring within is poorly understood. We show through numerical transport simulations, for two realistic heterogeneous permeability cases typical lowland rivers idealized homogeneous ones, there little difference reactive fields, bulk...

[1] This paper introduces the special section on "new modeling approaches and novel experimental technologies for improved understanding of process dynamics at aquifer-surface water interfaces." It is contextualizing framework 27 research papers by firth identifying gaps imminent challenges ecohydrological interfaces then discussing specific contributions (i) new developments in temperature/heat tracing GW-SW interfaces, (ii) methods to capture temporal spatial variability...

Abstract Fine particle deposition and streambed clogging affect many ecological biogeochemical processes, but little is known about the effects of groundwater flow into out rivers on clogging. We evaluated losing gaining suspended kaolinite clay particles in a sand resulting changes rates patterns hyporheic exchange flux (HEF). Observations from water column, accumulation sediments, with bed demonstrated that substantially reduced both HEF size zone. Clay were strongly coupled, leading to...

Abstract Rivers and their hyporheic zones play an important role in nutrient cycling. The fate of dissolved inorganic nitrogen is governed by reactions that occur the water column streambed sediments. Sediments are heterogeneous both term physical (e.g., hydraulic conductivity) chemical organic carbon content) properties, which influence residence times biogeochemical reactions. Yet few modeling studies have explored effects heterogeneity on transport zone. In this study, we simulated...

Transformation and removal of dissolved nutrients pollutants in streams strongly depends on microbial processes streambed sediments. The contact between these solutes communities is mediated by the physical transport from bulk stream to, through, streambed, a process broadly referred to as hyporheic exchange. Even though multiple biological influence rate exchange, we here show that many exchange mechanisms can be represented simply one‐dimensional diffusion process, where...

The prediction of pluvial flooding in urban environment shows many uncertainties due to the structure drainage network and usual limited amount available rain gauges. These two aspects, joint with increasing frequency intense events, highlight need a better comprehension main impact temporal spatial variability modelling process.Within PNRR RETURN project, SWMM model an subnetwork has been used perform sensitivity analysis on influence shape location simulated event for different return...

The large-scale installation of green roofs and other nature-based solutions in urban environment can provide multiple benefits for the sustainable development cities. implementation these solutions, facts, contributes to runoff mitigation during intense rainfall events, heat island reduction, biodiversity increase air quality improvement it ensures an added aesthetic value. Although have been largely investigated from a technical perspective ensure efficient effective maintenance, is also...

In recent decades, mountain villages have experienced significant depopulation, that, coupled with the devastating effects of climate change, has led to conditions decay and neglect. Therefore, it is essential implement measures aimed at promoting repopulation, enhancing tourism, ensuring hydrogeological safety in these areas. this context, Nature-based Solutions (NBS) represent a promising approach for restoration such locations, offering range services address emerging societal development...

Water management in urban areas is challenged by climate change and increasing population, the reduction of water consumption becoming a major issue. Thus, domestic greywater (GW) can be valuable source for non-potable purposes, coupled with benefits provided nature-based treatment approach. In this context, green walls have been proposed GW local reuse, hence coupling advantage reuse The amount available linked occupancy habits inhabitants, but there still limited knowledge on impact...