As a result of the limitations in the application of Darcy Law (V=ki) to linear-laminar flow regimes through porous media and due to the fact that in coarse alluviums, the Reynolds number may exceed its critical value, the so-called Laplas equation cannot be used for precise analyses of coarse granular foundations. A more general relationship is, therefore, required for such cases. However, a c...

Polluted aquifers can be decontaminated using either ZVI (zero valent iron) permeable reactive barriers (PRB) or injected ZVI. The placement of within the aquifer may take several decades to remediate contaminant plume. Remediation is further complicated by acting as an adsorbent remove some pollutants, while for other it acts a remediation catalyst. This study investigates alternative decontam...

Changes in land use due to open pit mining operations, indirectly affect the hydrological cycle. Open especially method, greatly subsurface conditions, such as lithology and hydrogeology. The purpose of this study was analyze hydrogeological conditions before on syncline folds Mahakam river. This research is an inductive with analytical approach which includes use, geology, area dominated by pl...

Theoretical analysis and numerical simulation were conducted to study the disaster-causing mechanism of structural instability overlying strata induced by water–rock coupling effectively prevent control powered support jammed accident during mining below unconsolidated confined aquifer. The influencing factors on stability structure analyzed, method aquifer was designed. evolution process stres...

Prolonged human spaceflight to another planet or an asteroid will introduce unique challenges of mitigating the risk of infection. During space travel, exposure to microgravity, radiation, and stress alter human immunoregulatory responses, which can in turn impact an astronaut's ability to prevent acquisition of infectious agents or reactivation of latent infection. In addition, microgravity af...

Synthetic microswimmers are envisioned to be useful in numerous applications, many of which occur in tightly confined spaces. It is therefore important to understand how confinement influences swimmer dynamics. Here we study the motility of bimetallic microswimmers in linear and curved channels. Our experiments show swimmer velocities increase, up to 5 times, with the degree of confinement, and...

Contamination of groundwater by microplastics (MPs) is increasingly reported and attracts a growing attention due to their potential risks. To understand how MPs migrate into groundwater, many previous works have investigated transport using man-made microspheres few microns or smaller as models. However, observed in the environment are more diverse size, shape, type, which may different migrat...

Analyses of areal variations in the subsidence and rebound occurring over stressed aquifer systems, in conjunction with measurements of the hydraulic head fluctuations causing these displacements, can yield valuable information about the compressibility and storage properties of the aquifer system. Historically, stress-strain relationships have been derived from paired extensometer/piezometer i...

Using a soil improvement biotechnology based on microbial-induced carbonate precipitation (MICP) to form horizontal water barrier in foundation pit dewatering can not only achieve good control effect, but also the cost and obtain economic environmental benefits. In this study, taking Shanghai layer ⑨ sand as research object, solution injected into by MICP grouting technology includes bacterial ...