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The majority of reported field studies, using acoustic backscattering, for the measurement nearbed suspended sediment processes, have been focussed on sites with sand size fractions and unimodal distributions. However, in many sedimentary environments, particularly estuaries rivers, sands muds coexist bed substrate, forming a regime that is often bimodal nature. To examine interaction sound the...

In this study, we examine the role that remotely forced ocean waves play in the hydrodynamics of an intertidal, estuarine mudflat. The observations indicate that long-period (10–20 s) ocean waves are a potentially important source of near-bed energy and shear stress in this environment. Over a two-week period in February 2001, we deployed an autonomous SonTek Hydra system on a mudflat in Centra...

abstract: in this research, the relationship between geomorphologic factors with underground water resources in zahab plain (in west of kermanshah) has been analyzed using by analyzing-deducing and weighting methods. first, by using of pizometeric and exploratory well data, variation of water table in zahab plain has been comparative analysis with geomorphic unites and then, the zahab watershed...

Bed shear stress in coarse–bed rivers with vegetation patches is one of the challenging parameters hydraulic engineering, mechanical fluvial morphology, and environmental studies. Based on this necessity, study, values bed four reaches Iran were estimated compared using methods boundary layer characteristics, logarithmic law, Darcy–Weisbach. Data collection study started February 2021 ended Apr...

Documenting the effects of agricultural land retirement on stream-sediment sources is critical to identifying management practices that improve water quality and aquatic habitat. Particularly difficult to quantify are the effects from conservation easements that commonly are discontinuous along channelized streams and ditches throughout the agricultural midwestern United States. Our hypotheses ...

In environmental flows, field and laboratory measurements of suspended sediments show two kinds concentration profiles. For coarse sediments, a near-bed upward convex profile is observed beneath the main concave profile. this study, we consider 1-DV models, namely, classical advection–diffusion equation (ADE) based on gradient diffusion model, kinetic model. Both need sediment diffusivity, whic...

River gravel mobility is an important control on river behaviour, morphology, and ecosystem processes. Gravel stability dependent abiotic flow sediment properties, alongside less widely acknowledged biotic The quagga mussel (Dreissena bugensis), a highly invasive bivalve, frequently occurs at high population densities in rivers lakes. Quagga mussels attach to benthic sediments using byssal thre...