نتایج جستجو برای: dike

تعداد نتایج: 1120  

2009
L. Wilson

Introduction: A wide variety of morphologic features representing a range of eruption styles has been documented on the Moon [e.g., 1-2]. We have characterized the nature of numerous steep-sided domes, small shields, cones, dark halo craters of internal origin, dark mantle deposits, linear rille-related deposits, and sinuous rille-related deposits on the Moon using Clementine multis-pectral, Ap...

2010
Vicki L. Hansen Anthony Olive

New geologic mapping reveals that Artemis, a unique 2400-km-diameter feature on Venus, is much larger than previously recognized, including a wide outer trough (>5000 km diameter), a radial dike swarm (12,000 km diameter), and a concentric wrinkle ridge suite (13,000 km diameter). Artemis’s evolution included formation of its interior and chasma, accompanied by lateral propagation of radial dik...

Journal: :Science 2008
Benjamin A Brooks James Foster David Sandwell Cecily J Wolfe Paul Okubo Michael Poland David Myer

We demonstrate that a recent dike intrusion probably triggered a slow fault-slip event (SSE) on Kilauea volcano's mobile south flank. Our analysis combined models of Advanced Land Observing Satellite interferometric dike-intrusion displacement maps with continuous Global Positioning System (GPS) displacement vectors to show that deformation nearly identical to four previous SSEs at Kilauea occu...

Journal: :تحقیقات مهندسی کشاورزی 0
سعید گوهری استادیار گروه مهندسی آب دانشگاه بوعلی سینا سیدعلی ایوب زاده دانشیار گروه مهندسی سازه های آبی دانشگاه تربیت مدرس مسعود قدسیان استاد گروه مهندسی عمران دانشگاه تربیت مدرس سیدعلی اکبر صالحی نیشابوری استاد گروه مهندسی عمران دانشگاه تربیت مدرس

flow passing through lateral intakes and channel junctions is turbulent. sediment flow and bed forms areaffected by these flow patterns and vice versa. in this research, a laboratory study was carried out toexplore a possible method for sediment control for a set of submerged vanes and a single spur dikesimultaneously. since a larger portion of the near-bed flow was diverted, the intake receive...

2012
Michael E. Purucker James W. Head Lionel Wilson

[1] A new magnetic map of the Moon, based on Lunar Prospector magnetometer observations, sheds light on the origin of the South Pole-Aitken basin (SPA), the largest and oldest of the recognized lunar basins. A set of WNW-trending linear to arcuate magnetic features, evident in both the radial and scalar observations, covers much of a 1000 km wide region centered on the NW portion of SPA. The so...

2007
Sarah E. Minson Douglas S. Dreger Roland Bürgmann Hiroo Kanamori Kristine M. Larson

[1] The volcanic eruption on Miyakejima, Japan, in 2000 was marked by the largest earthquake swarm ever recorded in Japan, a seismicity migration accompanying a dike intrusion as the dike propagated from Miyakejima to the northwest, and formation of a caldera on Mount Oyama on Miyakejima. In this study, we propose a seismic source model which can be used to model both seismic and geodetic displ...

2001
Qihao Weng

The formation and evolution of agricultural land uses in the Zhujiang Delta of South China are examined in the light of the dynamics of people and the environment and their interplay. The origin and propagation of agriculture are found to have a close relationship with the climate and sea level changes in the Holocene era. The development of rice cultivation, horticulture, and dike-pond system ...

Journal: :Physics of Fluids 2022

Three-dimensional numerical simulations of a flow past non-submerged diversion dike are performed for various blockage ratios (1/6 ≤ β 1/3) and Froude numbers (0.152 Fr 0.253). The instantaneous time-averaged characteristics, the evolution process mixing layers, bed shear stress analyzed. ratio plays an important role in momentum redistribution turbulent kinetic energy dike. As increases, veloc...

2013
WEIMING WU NICHOLAS C. KRAUS

A depth-averaged 2-D model has been developed for simulating coastal barrier breaching processes. The model solves the generalized shallow water equations and the non-equilibrium sediment transport and bed change equations in a coupled fashion using an explicit finite volume method on a rectangular grid. It considers interactions among transient flow, strong sediment transport, and rapid bed ch...

2007
A. A. CHODOS

Titanium-rich clinohumite and layered structure minerals are observed in kimberlite and as inclusions in pyropic garnets from the Moses Rock dike, a kimberlite-bearing breccia dike in San Juan County, Utah. Associated clinopyroxenes observed as inclusions within similar pyropes and also in kimberlite are estimated to have equilibrated at depths ranging from about 50 to 150 km at modest temperat...

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