Analytical models of river evolution predict meander narrowing and elongation which creates sinuosity-driven hyporheic exchange across the neck, by decreasing flow distance increasing head loss. We used a laboratory table close range photogrammetry to map analyze sinuosity as driver gradients during cutoff. The valley had relatively high slopes (1.8%) moderately cohesive sediment (10% talc, 90% sand) facilitate cutoff, ratios horizontal vertical scaling were distorted achieve dynamic...

Microplastics, plastic particles smaller than 5 mm, pose a significant environmental threat due to their persistence and distribution in aquatic ecosystems. Research on the dynamics of microplastics within freshwater systems, particularly concerning transport deposition along river corridors, remains insufficient. This study investigated occurrence at water–sediment interface White River near Muncie, Indiana. Sediment samples were collected from three sites: Woods (upstream), Westside Park...

There is a critical need for an easy-to-adopt approach to estimate how different land use and management practices affect regional nutrient release into water bodies. As typical agriculture dominated watershed in the Midwest, Indiana's White River Watershed has observed large amounts of from diffusive sources. This situation will likely worsen with population growth, climate change, change. In this study, we integrated change scenarios, experimental data compiled literature, simulation model...

Meandering rivers are distinguished by their characteristic sinuosity, which is subject to modulation through channel cutoff, resulting in the formation of oxbow lakes within abandoned meander loops. Throughout evolutionary course a river, these cutoffs establish connection between and floodplain systems, both crucial maintaining dynamic equilibrium river system. Nonetheless, interactive its influence on transient behavior channel’s morphodynamics during cutoff event frequently reduced...

Shortwave solar radiation is an important component of the surface energy balance and provides principal source for terrestrial ecosystems. This paper presents a machine learning approach in form random forest (RF) model estimating daily downward flux at land over complex terrain using MODIS (MODerate Resolution Imaging Spectroradiometer) remote sensing data. The model-building technique makes use unique network 16 measurements semi-arid Reynolds Creek Experimental Watershed Critical Zone...

Microplastic pollution is an emerging environmental concern, and has been found in remote regions, including the high Himalaya mountains. However, abundance sources of microplastics region are not well documented. This research investigated abundance, types, potential Sagarmatha National Park (SNP), a rural sparsely populated Nepal on southern side Water samples were collected from streams tributaries SNP May 2022. The average microplastic concentration among all was 2.0 ± 1.7 pieces/L,...

High precision and high density measurements of surface water topography in laboratory rivers are useful hydro-morphodynamic studies to analyze energy, momentum, mass balances the river system. A close range photogrammetry (CRP) method is developed provide instantaneous sub-mm vertical horizontal resolutions along a flowing reach, which infeasible with typical mechanical point-based stage measurements. The CRP uses wax powder seeding two synchronized nonmetric digital cameras capture...

Abstract Meander bends in alluvial rivers morphologically evolve towards meander cut‐off with narrowing intra‐meander necks, and this should steepen hydraulic gradients intensify hyporheic flux. This research used dye tracking head loss measurements a 1 : 500 planimetrically scaled laboratory river table to quantify the spatial temporal intensification of flux rates at two evolution ages. The younger bend, M1, had sinuosity 2.3, neck width 0.39 cm, 0.6% slope, older M3, 5.2, 0.12 0.5% slope....

Abstract. Humans have significantly altered the redistribution of water in intensively managed hydrologic systems, shifting spatiotemporal patterns surface water. Evaluating availability requires integration processes and associated human influences. In this study, we summarize development evaluation an extensible model that explicitly integrates rights to spatially distribute irrigation waters a semi-arid agricultural region western US, using Envision integrated modeling platform. The...

Abstract. In semiarid and arid regions with intensively managed water supplies, scarcity is a product of interactions between complex biophysical processes human activities. Evaluating under climate change necessitates modeling how these coupled interact redistribute waters in the system alternative conditions. A particular challenge on input lies adequately capturing plausible range variability future along central tendencies. This study generates large ensemble daily realizations by...

Abstract In‐channel structures are often installed in alluvial rivers during restoration to steer currents, but they also modify the streambed morphology and water surface profile, alter hydraulic gradients driving ecologically important hyporheic exchange. Although river features before after need be compared, few studies have collected detailed observations facilitate this comparison. We created a laboratory mobile‐bed meandering measurements highly sinuous meander installation of...

Glacier mass balance change is among the best indicators of glacier response to climate change. Due its inaccessibility and limited observation, little known about Dongkemadi Ice Field (DIF) in Tanggula Mountains located source region Yangtze River central Tibetan Plateau. Here, an enhanced temperature index–based model considering area was applied study temporal–spatial variation on DIF from 1989 2012 assess The forced by reconstructed precipitation adjacent national meteorological stations...

Hydrologic scientists and water resource managers often focus on different facets of flow regimes in changing climates. The objective this work is to examine potential hydrological changes the Upper Boise River Basin, Idaho, USA context biophysical variables their impacts a key variable governing administration resources region an integrated way. This snowmelt-dominated, mountainous watershed supplies semi-arid, agriculturally intensive, but rapidly urbanizing, region. Using Envision...

Abstract During the evolution of meander bends, intra‐meander groundwater head gradients steepen and generate zones accelerated water nutrient fluxes important for ecosystem processes. This paper compares contrasts three MODFLOW model packages based on their simulation flux two stages observed in a sandbox river table one level bed clogging, where hydraulic conductivity is lower than adjacent aquifer. These are Time‐Variant Specified Head package [constant (CHD)], River (RIV),...

Abstract. Humans have significantly altered the redistribution of water in intensively managed hydrologic systems, shifting spatiotemporal patterns surface water. Evaluating availability requires integration processes and associated human influences. In this study, we summarize development evaluation an extensible model that explicitly integrates rights to spatially distribute irrigation waters a semi-arid agricultural region Western United States, using Envision integrated modeling...

Climate change directly affects the hydrologic cycle in mountainous watersheds, which has consequences for downstream users. Improved water projections under diverse potential climate futures are critical to improving security and management these watersheds. The science researchers resource managers, however, often focus on different metrics of flow regimes changing climates. research community tends more closely biophysical state flux variables system. Managers, meanwhile, tend key...

Abstract Nitrate and organic contamination from Midwest rivers, including the White River at Muncie, IN, has been an on-going concern contributes to hypoxic zone in Gulf. Despite rich data, recent water quality changes have rarely investigated. This study employed 16 years of continuous monitoring biochemical oxygen demand (BOD), dissolved (DO), nitrate–nitrite as nitrogen (NN) five sites near analyzed trend pollution sources. A novel approach, Weighted Regression on Time, Discharge Seasons...