ABSTRACT The cumulative effects of constructed dams on the mainstream Mekong River and its tributaries are transforming fundamental characteristics river regime with pervasive repercussions not only for natural systems but also social economies. In this context, study addresses issues identified above by coupling reservoir model from CaMa-Flood-Dam Watershed Environmental Hydrology Model . proposed models were well calibrated validated before embarking assessment dam effects. results showed...

Over 3,300 unscreened agricultural water diversion pipes line the levees and riverbanks of Sacramento River (California) watershed, where threatened Southern Distinct Population Segment green sturgeon, Acipenser medirostris, spawn. The number sturgeon drawn into (entrained) killed by these is greatly unknown. We examined avoidance behaviors entrainment susceptibility juvenile (35±0.6 cm mean fork length) to in a large (>500-kl) outdoor flume with 0.46-m-diameter water-diversion pipe. Fish...

Abstract. In this study dimensionally consistent governing equations of continuity and motion for transient soil water flow flux in fractional time multiple space dimensions anisotropic media are developed. Due to the anisotropy hydraulic conductivities natural soils, medium within which occurs is essentially anisotropic. Accordingly, two horizontal one vertical directions considered be different, resulting multi-fractional multi-dimensional takes place. Toward development equations, first a...

Kuma River Watershed in Japan. High-quality precipitation information is desirable hydrological modeling and water resources management. This study aimed to generate long-term fine-resolution datasets over the region. A hybrid downscaling framework that integrates a dynamical approach by Weather Research Forecasting (WRF) model deep learning Convolutional Neural Network (CNN) was proposed derive at fine resolutions from ERA-Interim datasets. The then applied coastal watershed merit of...

Abstract The sea level change along the Peninsular Malaysia and Sabah–Sarawak coastlines for 21st century is investigated coastal areas of because expected climate during century. spatial variation estimated by assimilating global mean projections from Atmosphere–Ocean coupled Global Climate Model/General Circulation Model (AOGCM) simulations to satellite altimeter observations subject coastlines. Using assimilated AOGCM projections, around coastline projected rise with a in range 0.066...

The conditions under which the Saint Venant equations system for unsteady open channel flow, as an initial–boundary value problem, becomes self-similar are investigated by utilizing one-parameter Lie group of point scaling transformations. One advantages this methodology is that self-similarity due to initial and boundary can also be thoroughly in addition governing equation. obtained compared with relationships derived through Froude similitude. It shown problem a one-dimensional flow...

Abstract Juvenile Chinook Salmon Oncorhynchus tshawytscha from California's Central Valley must pass thousands of unscreened water diversion pipes during their out‐migration to the Pacific Ocean. The number fish that become entrained into (drawn through) these diversions at different hydraulic and environmental conditions is currently unknown. We tested ability juvenile avoid entrainment a 0.46‐m‐diameter pipe while swimming in large‐river‐simulation flume. Fish experiments were conducted...

The paper reports on the prediction of flow in a reach Sacramento River with focus part river's bank where serious erosion has occurred. simulations were obtained using three-dimensional Navier–Stokes solver which utilized body-fitted coordinates to represent complex river bathymetry. Comparative predictions two-dimensional, depth-averaged formulation. Local (nested) mesh refinement was employed provide necessary resolution geometry region interest. study focuses assessment effectiveness...

Abstract. Groundwater closely interacts with surface water and even climate systems in most hydroclimatic settings. Fractal scaling analysis of groundwater dynamics is significance modeling hydrological processes by considering potential temporal long-range dependence crossovers the level fluctuations. In this study, it demonstrated that fluctuations confined aquifer wells long observations exhibit site-specific fractal behavior. Detrended fluctuation (DFA) was utilized to quantify...

Current methods utilized in scaling sediment transport unsteady open-channel flow result a number of model and scale effects, decreasing the accuracy applicability models. Identifying conditions under which governing equations are self-similar, require no diameter or density scaling, can reduce effects increase applicability. Conditions for self-similarity one-dimensional suspended identified by applying one-parameter Lie group point transformations, both general case with unscaled...

Entrainment through water-diversion structures is a major passage challenge for fishes in watersheds worldwide. Behavioral guidance devices may be effective passing fish by diversion inlets, thereby decreasing entrainment without reducing rates, but data on their effectiveness limited. In California’s central valley, out-migrating Chinook salmon (Oncorhynchus tshawytscha) are species at risk unscreened, small-scale pipes. Therefore, we tested susceptibility and behavior of juvenile...

In this study, a regional climate model was used to dynamically downscale 15 future projections from three GCMs covering four emission scenarios (SRES B1, A1FI, A1B, A2) based on Coupled Model Intercomparison Project phase 3 (CMIP3) datasets 6-km horizontal resolution over the whole Peninsular Malaysia. Impacts of change in 21st century precipitation, air temperature, and soil water storage were assessed ten watersheds twelve coastal regions. Then, by coupling physical hydrology with model,...

Diversion (i.e. extraction) of water from rivers and estuaries can potentially affect native wildlife populations if operation is not carefully managed. For example, open, unmodified diversions act as a source injury or mortality to resident migratory fishes entrainment impingement, cause habitat degradation fragmentation. Fish-protection devices, such exclusion screens, louvres sensory deterrents, physically behaviourally deter fish approaching being entrained into diversions. However,...

A stochastic kinematic wave model for open-channel flow under uncertain channel properties is developed. The Fokker-Planck equation (FPE) of the process developed by using method characteristics. Every partial differential has a one-to-one relationship with nonlocal Lagrangian-Eulerian FPE (LEFPE). As such, one can develop an LEFPE governing any hydrologic or hydraulic as physically based particular process. linear, deterministic, in Eulerian-Lagrangian form, provides quantitative...

Abstract. Using fractional calculus, a dimensionally consistent governing equation of transient, saturated groundwater flow in time multi-fractional confined aquifer is developed. First, continuity for transient and multi-fractional, multidimensional For the water flux within aquifer, also The then obtained by combining equations. To illustrate capability proposed numerical application to problem was performed.