Abstract Almost every year, Vietnam suffers floods resulting in the loss of many lives and considerable costs for damaged lost properties. This study proposes a forecasting system that couples dynamical downscaling technique with hydrologic models to forecast real-time flood events lead time ranging from one three days. approach is demonstrated by applying regional numerical weather prediction physically based model Thanh My Nong Son watersheds. System inputs are provided two global NWPs,...

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...

It is important to assess the reliability of high-resolution climate variables used as input hydrologic models. High-resolution data often obtained through downscaling Global Climate Models and/or historical reanalysis, depending on application. In this study, performance dynamically downscaled precipitation from National Centers for Environmental Prediction (NCEP) and Center Atmospheric Research (NCAR) reanalysis (NCEP/NCAR I) was evaluated at point scale, watershed regional scale against...

The Cache Creek Settling Basin (CCSB) is a 14.5 square-kilometer sediment retention basin designed to trap and reduce loads into the Yolo Bypass. basin, 13-kilometer stretch of leveed creek from United States Geological Survey (USGS) at gauge (11452500) upstream boundary were engineered safely conduct flows up 850 cubic meters per second with approximately 1-meter freeboard. sole purpose retain protect floodway capacity As CCSB functions by spreading incoming flow over heterogeneous terrain,...

In this study several issues with the standard flood frequency analysis are discussed in context of a changing hydro-climate 21st century. Among these loss statistical equilibrium studied region during century has serious implications on that is some detail. An alternative method to within framework climate based ensemble future projections reported and demonstrated by numerical application target watershed.

Abstract Estimation of probable maximum flood (PMF) is a crucial process in water resources management and the design large hydraulic structures. However, there are uncertainties estimation hydrologic conditions that contribute to extreme floods. In particular, this case snow‐dominated regions, as surface air temperature wind speed understood have substantial effect on magnitude during storm event. Motivated by development new approach investigate estimate reliable PMF values an attempt...

Abstract Snow is an important component of the Earth's climate system and particularly vulnerable to global warming. It has been suggested that warmer temperatures may cause significant declines in snow water content cover duration. In this study, snowfall snowmelt were projected by means a regional model was coupled physically based over Shasta Dam watershed assess changes duration during 21st century. This requires both physical data future projections. These include topography, soils,...

A lack of observations within watersheds can make the production streamflow data via hydrologic models a big challenge. This study evaluates model performance Watershed Environmental Hydrology Hydro-Climate Model (WEHY-HCM), reproducing in sparsely gauged watershed. The fifth generation mesoscale (MM5) is utilized WEHY-HCM as an atmospheric module coupling with its process-based module, WEHY. set up over watershed and spatially downscaled reconstructed to 3-km horizontal grid resolution...

Abstract Two‐dimensional simulation of highly heterogeneous domains, especially those with disparate length scales, roughness conditions, and geometries, often leads to challenges such as long computation times numerical instability. Simulation challenging domains is needed guide flood management environmental regulation agencies in operation potential domain modifications. This work evaluates the ability a two‐dimensional unsteady hydrodynamic model represent long‐duration transient flows...

The Cache Creek Settling Basin (CCSB) is subject to inflows with high sediment concentration. Originally designed protect the floodway capacity in Yolo Bypass, current performance of CCSB question following over 70 years loads. Operation plans dictate that alterations be made levees and/or overflow weir basin when trap efficiencies are less than 30 percent. CCHE2D model, a 2D depth-averaged hydrodynamics and transport applied simulate process CCSB. Simulations performed evaluate efficiency...

Abstract Throughout the world, louver‐bypass systems are a common method for fish protection at water diversion sites. Their performance has been evaluated pelagic, strong‐swimming teleost fishes, but limited information exists regarding effectiveness of louvers guiding sturgeon, despite being globally threatened taxon. This study used controlled laboratory experiments to quantify louver efficiency juvenile green sturgeon under range conditions. Fish guidance was influenced most strongly by...

Abstract Most of the water diversions on Sacramento and San Joaquin Rivers (California, United States) their tributaries are currently unscreened. These unscreened commonly used for irrigation potentially harmful to migrating resident fishes. A large flume (test section: 18.29 m long, 3.05 wide 3.20 high) was investigate hydraulic fields near an diversion under ecologically hydraulically relevant rates channel flow characteristics. We investigated all combinations three (0.28, 0.42, 0.57 3...

Sediment transported along with extreme flooding may greatly affect flood conveyance and associated operations management in the lower cache creek system. In this study, relative sediment capture transport creek, under current bathymetric conditions one modification alternative (2A), is evaluated. dynamics system, which includes a floodplain settling basin, are evaluated flow events. Of particular interest trap efficiency of basin (CCSB) different scenarios. The CCSB was designed as...

Abstract Outmigrating, juvenile Chinook salmon Oncorhynchus tshawytscha , with access to floodplains (e.g., Yolo Bypass California, USA), grow faster than those restricted the main channel of Sacramento River. How these young might use rooted, vegetative structure decrease energy expenditures) while holding positions in flowing water on and flooded riparian zones is unknown. We conducted daytime experiments a large (24.4 m long) flume containing planted area (9.76 × 1.22 m) sandbar willows,...

Abstract The spatial and temporal availability reliability of hydrological data are substantial contributions to the accuracy watershed modeling; unfortunately, such requirements challenging perhaps impossible in many regions world. In this study, conditions simulated using hydrologic model-WEHY, whose input obtained from a hybrid downscaling technique provide reliable high resolution data. is coupled hydroclimate machine learning models; wherein global atmospheric reanalysis data, including...

The governing physical process of sediment transport can be represented in a scale model without the simplifying assumptions required numerical modeling, making modeling considerable complement to simulations. However, current methods utilized scaling unsteady open-channel flow result number and effects, which decrease accuracy applicability models. These effects may reduced increased by determining conditions under equation for nonequilibrium flows are self-similar require no diameter...

This study introduced a new method that unites hydrologic model using physical infiltration mechanisms with combination of soil group (soil) and land use treatment class (cover) to integrate LULC data into data. The has been incorporated the WEHY simulate conditions over Cache Creek Watershed (CCW) Shasta Dam (SDW) in Northern California. For testing effects integrating on simulations, this used four different datasets. first dataset (S1) was obtained from local database including SSURGO...

Self-similarity conditions and scale invariance of unsteady one-dimensional bedload sediment transport are investigated through the application one-parameter Lie group point scaling transformations. Determining suitability equations has been plagued by empiricism. Two to determine a representation regime that will be self-similar invariant at variety different scaled domains. Furthermore, transformations required physically process without material properties investigated. By applying method...