Erosion threshold of a model granular bed by a jet in a quasi bidimensional configuration has been studied experimentally in both laminar and turbulent regimes. The jet is a liquid sheet which impinges normally a packing of immersed beads monodisperse in size and density. The erosion threshold has been characterized at different impact distances of the jet on the sediment and for different grain size and fluid viscosity. In the explored range of parameters, we show that the erosion threshold is well described by a critical inertial Shields number based on the local flow velocity at the impinging point. This has been done by a careful analysis of the different jet flow regimes taking into account the position of the virtual origin of the jet.

We present a detailed analysis of the morphology of craters induced by a round gas jet impinging vertically onto horizontal non-cohesive granular bed. The virtual origin of the jet from a self-similar model is taken into account both in the size scaling of the craters and in the inertial Shields number that governs the erosive processes. Two intrinsic types of craters with different morphologies are found and characterized in detail from shallow parabolic craters (type I) to deep conical craters (type II) whereas a flat central part arises from a finite bed thickness and leads to truncated morphologies. The transitions between the different crater morphologies are also analyzed in detail. The local Shields number based on the local velocity at the evolving bed surface is shown to depend on the local crater shape at the impinging point of the jet.

In this article, I explore the neoliberalization of wellness practices and the negative impact that this has had on the production and consumption of food products otherwise considered ‘healthy’ and or ‘ecofriendly’. Specifically, I argue that capitalist notions of productivity and wellness have become intertwined, resulting in the large-scale destruction of both our environment and of the politically and economically marginalized. First, I examine the capitalist co-option of the concept of self-care and its origins in the 1960s civil rights movement as a response to a discriminatory medical establishment. Afterward, I explore the corporate-led evolution of wellness culture, illustrating its consequences for the environment, and the security and health of marginalized populations around the world. Finally, I argue that holistic and community-centered concepts of productivity and wellness are necessary for combatting inequality and climate crisis.