Ground-based and airborne Doppler radar data collected during passage of frontal rainstorms over the European Alps and Cascade Mountains of Oregon are found to exhibit characteristic cross-barrier flow and precipitation patterns. A stably stratified layer of blocked (or partially blocked) low-momentum flow below mountain-crest level is separated from strong cross-barrier flow aloft by a concent...

Abstract In a stepped spillway, the spillway face is provided with series of steps from near crest to toe. This type attractive for water resource management because it dissipates energy that within flow. When dissipated by steps, reduces reduction otherwise must occur at toe spillway. present study, nine physical models slopes 15, 25, 45° and number varying 5 50 have been constructed. The spil...

The lifetime and efficiency of dams is endangered by the process of sedimentation. To ensure the sustainable use of reservoirs, many sediment management techniques exist, among which venting of turbidity currents. Nevertheless, a number of practical questions remain unanswered due to a lack of systematic investigations. The present research introduces venting and evaluates its performance using...

In the scope of dam rehabilitation to manage floods increase or storage, Piano Key Weir is a good solution for concrete dams. The efficiency Weirs now well demonstrated through various experimental studies. Until most prototypes close Type A using symmetrical up- and downstream overhangs structural reasons. position influences inlet outlet key slopes cross section as side crest length influence...

Four new AMS 14C ages, glacial mapping, and measurements of soil development, loess thickness, and moraine morphology constrain the age and extent of at least three Quaternary advances by outlet lobes of an ice cap over the Ahklun Mountains of southwestern Alaska. The relative-age data are from 107 sites correlated to 25 ice-marginal positions in the Kanektok, Goodnews, Togiak, and Kulukak Rive...

A frequency-domain parametric study using generalized consistent transmitting boundaries has been performed to evaluate the significance of topographic effects on the seismic response of steep slopes. The results show that the peak amplification of motion at the crest of a slope occurs at a normalized frequency 1t/2 = 0.2, where H is the slope height and 2 is the wavelength of the motion. The i...