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Groundwater Depletion and Salinity in Yazd, Iran
The central Iranian plateau contains part or all of five provinces and covers more than a third of the total area of Iran (Figure 3). This area has one of the most unfavorable hydrologic...

Watershed Modeling of The Western Coast Wadis of Egypt
The main goal of this paper is to present the water resources assessment from both surface and ground-water resvoirs of the western coast watersheds in Egypt. Two submodels were used for...

Regional Flood-Frequency Relations for Streams with Many Years of No Flow
In the southwestern United States, flood-frequency relations for streams that drain small arid basins are difficult to estimate, largely because of the extreme temporal and spatial variability...

Cyclic Streamflow Test for Validity of Randomness
Long-term Arizona runoff records used for flood insurance frequency analysis estimates are compared with long-term precipitation station records for cyclic behavior. Runoff cumulative...

Drought Risk Analysis Based on Hydrologic Records of the River Nile
The characteristics of the parameters of hydrologic droughts are studied by analysing and modeling the maximum and 'minimum' stage-level series of the River Nile...

Simulating Spatially Varied Thunderstorm Rainfall
Using data from two independent, relatively dense networks of raingages located in the vicinity of Tucson, Arizona, the spatial distribution of thunderstorm rainfall was determined as...

Rainfall-Sampling Impacts on Runoff
The sensitivity of computed peak-runoff rates to rainfall-sampling frequency over three semiarid watersheds in southeastern Arizona of increasing size is investigated using the methodology...

Precipitation on Arid or Semi-Arid Regions of the Southwestern United States: Research Needs from a Consultant's Perspective
In terms of both instantaneous flow peaks and total runoff volumes, a key element in the quantification of stormwater runoff from arid and semi-arid regions of the southwestern United...

Structural Control of Ground-Water Induced Debris Flows
A number of case studies have attributed debris flow initiation to the effect of elevated pore pressure from a bedrock ground-water source. Debris flows on slopes underlain by Precambrian...

Initiation and Laws of Motion of Debris Flow
The mechanism of initiation and laws of motion of debris flow are studied experimentally, by allowing water or clay muds, with different clay concentrations and at different flow rates,...

Geomorphology and Sedimentology of a Valley Fan, Southern Utah
Sink Valley, located in semi-arid west-central Kane County, Utah, lies on an erosional surface of Cretaceous age Tropic Shale. The valley contains an example of a previously undocumented...

Predicting Alluvial-Fan Sediment-Water Slurry Characteristics and Behavior from Sedimentology and Stratigraphy of Past Deposits
Slurry characteristics can be predicted by a combination of field and laboratory analyses. Field observations are needed to determine deposit stratigraphy and to estimate the abundance...

Activation and Degeneration of Turbidity Currents
Flow properties of the front of a turbidity current are investigated using the two layers model which takes into account of pick up and deposition of sediment. The amount of pick up rate...

Resistance Consisting of Both Viscous Force and Dispersive Force
A set of specially designed experiments have been carried for studying the resistance of a flow consisting of water and both fine and coarse particles. The viscous force caused by fine...

Sediment Transport Characteristics of Hyperconcentrated Flow with Suspended Load
In this paper, based on the analysis of the ovserved data, a set of theories is proposed of the transport of heper-concentrated sediment, the basic points of which are: (1) The hyperconcentrated...

Water Quality Study in an Arid Region Lake: Lake Bosten, Northwest China
This paper gives a brief description of Lake Bosten, its importance to Xinjiang Province of the PRC, objectives of an on-going study, and some preliminary results. This on-going study...

Hydrologic Analysis Model for Screening Wetland Restoration Sites in the Rainwater Basin, Nebraska
Historically, the Rainwater Basin in south central Nebraska contained approximately 4,000 wetlands. Today, over 90 percent of those wetlands have been lost, primarily due to drainage for...

Arid Zone Hydrologic Implications for the Proposed Yucca Mountain Repository
The U.S. Department of Energy (DOE) has chosen Yucca Mountain, Nevada for characterization to determine if it is suitable to become the Nation's first High-Level Radioactive...

A Study on Sediment Transportation in Debris Flow
By analysing the observation data of debris flows at the Jiangjia Ravine, Dongchuan, Yunnan Province, China in 1982-1986, this paper comprehensively and systematically describes the sediment...

Sediment Transport Models for Small Gullies in Loess Hill and Gully Regions
Three items are studied: the equation of the relation between discharge and sediment for small gullies derived by using the theory of river dynamics; the extension of the Nash theory of...

 

 

 

 

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