We are developing a three-dimensional numerical model that implements algorithms for sediment transport and evolution of bottom morphology in the coastal-circulation model Regional Ocean Modeling System (ROMS v3.0), and provides a two-way link between ROMS and the wave model Simulating Waves in the Nearshore (SWAN) via the ModelCoupling Toolkit. The coupled model is applicable for fluvial, estu...

Eolian dune fields on Earth and Mars evolve as complex systems within a set of boundary conditions. A source-to-sink comparison indicates that although differences exist in sediment production and transport, the systems largely converge at the dune-flow and pattern-development levels, but again differ in modes of accumulation and preservation. On Earth, where winds frequently exceed threshold s...

Sungsang Village is located at the mouth of Musi River making this area dense with settlements and transportation activities, contributes to damage results in decreased water quality. This study aims analyze concentrations Pb Cd water, sediment white shrimp (Penaeus merguiensis) examine level accumulation through BCF values waters I Village. Results showed that average concentration was 0.104 m...

The key to integrating a biological index to output from the SWAT/HUMUS model is to develop a relationship between the pertinent output from SWAT (nutrients and sediment) to the biological index. Wang et al. (2007) began developing the relationship between nutrients and assemblages of fish and macroinvertebrates in 240 wadeable streams in Wisconsin. From their sampling data they were able to de...

Recovery of an ecosystem following disturbance can be severely hampered or even shift altogether when a point disturbance exceeds a certain spatial threshold. Such scale-dependent dynamics may be caused by preemptive competition, but may also result from diminished self-facilitation due to weakened ecosystem engineering. Moreover, disturbance can facilitate colonization by engineering species t...

The hatching of cladoceran ephippia from a 15-cm long sediment core was investigated, and Ceriodaphnia quadrangula clones were isolated from different sediment layers. Bosmina microfossil data were also analyzed, and compared with the corresponding data from a Pb210 dated core, which allowed us to infer the age of the sediment layers. Using changes in Bosmina microfossil morphologies, we were, ...

The pollution level of Lake Bafa was investigated by collecting fish samples {Dicentrarchus labrax (sea bass), Liza ramada (mullet) and Anguilla anguilla (eel)}, surface sediment, and core samples. In all these samples, 210Po and 210Pb concentrations were estimated, and total annual dose rates were obtained for each species. Some heavy metal (Cr, Ni, Pb, Cd, Mn, Fe, and Zn) concentration levels...

A physically rational model for river width is critical to predict macroscopic landscape evolution driven by fluvial sediment transport. Growing evidence suggests that rivers widen until the stress exerted fluid on bed surface close entrainment of bank material. In this study, we test limits as a closure assumption in dynamically evolving systems. We consider simple laboratory channel with fixe...