###### Abstract  
During the routing of coarse particles in sedimentary environments, the particles are subjected to abrasion, leading to mass loss and changes in the particles' morphology. The particles become more spherical, rounded, and smooth. Here, particles' (quarried dolomite) morphological evolution of three shape aspects (form, roundness, and texture) and the mass decreases obtained in two sets of experiments in two different setups are presented. Abrasion experiments were carried out in cycles. Between cycles, morphological parameters and mass losses were tracked. Abrasion was investigated with consideration of the energy and power the apparatuses used that the material was subjected to, in contrast to the often-used estimated travel distances or duration of the abrasion. The goal was to examine if the two setups can be comparable and inter-transferable, also to other similar abrasion setups. The experimental equipment, a micro-Deval apparatus and a Los Angeles machine, are standardised and widely used. The applied tests were modified. Morphological/shape parameters were determined using dynamic image analysis. The results of the tests show the influence of machine power (energy introduction rate) on mass loss and morphological change. Los Angeles (high-energy) abrasion resulted in higher mass loss values than micro-Deval (low-energy) abrasion. The mass loss results can be brought to comparable values by a newly introduced mass- and power-dependent coefficient. Low-energy abrasion resulted in faster rounding than high-energy abrasion, whereas form stayed nearly the same. In contrast, form changed rapidly during high-energy abrasion. abrasion; micro-Deval test; Los Angeles test; energy-based abrasion; particle morphology evolution; dynamic image analysis +
Footnote †: journal: _Sci. Fluvial transport is one of the main processes of particles' transport. When subjected to stream activity, particles move in streams or stagnate on stream beds or bars, depending on the stream power conditions. The changes of particles in a fluvial environment have been observed and studied for a long time. Numerous researchers have, in some way, simulated fluvial abrasion in laboratory conditions, or observed it in the field. One of the first, and probably the most widely accepted, studies is that of [PERSON] [8]. [PERSON]'s fining law describes particle size as a power function of the distance a particle has travelled and the lithology-specific abrasion coefficient. In the period following [PERSON]'s study, numerous scholars contributed to the research of this phenomenon. It was found that rather than it being constant, the abrasion coefficient changes, becoming smaller with mass loss and distances travelled. Most of the work published on the subject reproduces fluvial abrasion in a kind of tumbling mill (e.g., [9; 10; 11; 12]) or a flume (e.g., [2; 13]), comparing it to the phenomenon occurring in nature according to the distances travelled. Besides the investigation of fluvial abrasion, tumbling mills and annular flumes are used for abrasion experiments in a variety of other applications, such as (but not limited to) material sciences (e.g., [14; 15]), planetary sciences (e.g., [16; 17]), density current studies (e.g., [18; 19]), or archaeological and anthropological sciences (e.g., [20; 21; 22]). In this work, we tried to approach the long-studied process of fluvial abrasion from a different point of view. Additionally, we tried to introduce the energy aspect (mechanical work) into the fluvial abrasion research, in contrast to the common focus of the studies--estimated particle travel distances, or abrasion times. The use of standardised and accessible equipment, frequently used in rock mechanics for aggregate testing, ensures the repeatability and consistency of experiments. Similar estimated travel distances (according to circumference and number of revolutions) can result in very different changes of the same material particles (in mass and morphology).