Insects that live in the saltwater and brackish marshes, which fringe the northern coast of the Gulf of Mexico, are largely unstudied. During 2011-2013, a survey of insect fauna of the coastal salt marshes of the Mississippi Delta in Louisiana was conducted. We present the species of terrestrial representatives of Heteroptera and Auchenorrhyncha collected during that study. The Auchenorrhyncha are represented by 33 species in 6 families, with Cicadellidae (16 species) and Delphacidae (13 spp.), and are the most diverse. The terrestrial heteropterans are represented by 11 species in 5 families with the majority of species in Miridae (6 spp.). A list of species, annotated with numbers of specimens collected, ranges of collection dates (seasonality), and published information on their hosts, habitats, and ranges, is presented. Of 44 identified species, ten species (22.7%) are reported from Louisiana for the first time. The paper provides evidence of a diverse terrestrial arthropod community in brackish marshes; a community that is largely understudied.

Abstract. This paper among the first presents the application and validation of a hydrodynamic model (Adaptive Hydraulics model, AdH) of the McCarran ranch. We use the AdH model with topographic data by combining the DEM data from USGS seamless server and the ESRI tin data from United States Army Corps of Engineers (USACE) to predict floodplain inundation for a river reach of ~10 km located at lower Truckee River in Nevada state. We tested the mesh independence, sensitivity of input parameters and time steps, and then compared the modeling results to the existing gauged data (both the discharge and water stage heights). Results show that the accuracy of prediction from AdH model can decline slightly at higher discharge and water levels. The modeling results are much sensitive to the roughness coefficient of main channel, suggesting the model calibration should give priority to the main channel roughness. The simulation results suggest that large flood events could lead to a significantly higher proportion of total flow that routed through the floodplains. During peak discharge, a river channel constriction diverted as much as 65% of the river's 512.3 m3s−1 discharge into the floodplain. During the overbank flow, the transboundary flux ratio is about 5–45% of the total river discharge. Results also showed that both the relation of inundation area and volume between the discharge exhibit an apparent looped curve form.