نتایج جستجو برای: rock erodibility
تعداد نتایج: 39418 فیلتر نتایج به سال:
Abstract. Many mountain ranges survive in a phase of erosional decay for millions years following the cessation tectonic activity. Landscape dynamics these post-orogenic settings have long puzzled geologists due to expectation that topographic relief should decline with time. Our understanding how denudation rates, crustal dynamics, bedrock erodibility, climate, and mantle-driven processes inte...
Relations between riverine export (load) of total nitrogen (N) and total phosphorus (P) from 133 large agricultural watersheds in the United States and factors affecting nutrient transport were evaluated using empirical regression models. After controlling for anthropogenic inputs and other landscape factors affecting nutrient transport-such as runoff, precipitation, slope, number of reservoirs...
Riparian forest vegetation is widely believed to protect riverbanks from erosion, but few studies have quantified the effect of riparian vegetation removal on rates of river channel migration. Measured historical changes in a river channel centreline, combined with mapped changes in floodplain vegetation, provide an opportunity to test how riparian vegetation cover affects the erodibility of ri...
[1] The role of bedrock fractures and rock mass strength is often considered a primary influence on the efficiency of surface processes and the morphology of landscapes. Quantifying bedrock characteristics at hillslope scales, however, has proven difficult. Here, we present a new field‐based method for quantifying the depth and apparent density of bedrock fractures within the shallow subsurface...
This study measured runoff and sediment concentration from the tire track and from the non-tire track to determine infiltration, interrill erodibility, and vegetative cover impacts of reopening an abandoned forest road. Runoff was lowest on the non-track portion of the abandoned road and highest on the reopened road. Sediment concentrations were significantly higher on the reopened road. Increa...
Paute-Cardenillo (owned by Celec Ep-Hidropaute) is a dam with maximum height 135 m located in the Paute River in Ecuador. Its hydroelectric production will be integrated at the National Electric System of Ecuador with an installed capacity of 600 MW which will produce 3300 GWh per year. To evaluate the stability and safety of the structure, it is necessary to ascertain the shape and dimensions ...
Understanding how bedrock properties influence the valley-forming processes of Alpine landscapes is an outstanding challenge. A multi-methodological approach was used to uniformly quantify fault frequency, orientation, and rock hardness crystalline basement rocks evaluate their impact on erosional that shaped valley Aletsch Glacier, Switzerland. We show variations in frequency orientations, imp...
نموگرافی جدید برای برآورد عامل فرسایشپذیری (K) در بخشی از خاکهای نواحی نیمهخشک در شمالغربی ایران
Proper evaluation of soil erodibility factor is very important in assessment of soil erosion. In this study, soil erodibility factor (K) was assessed in a zone, 900 km2 in area in Hashtrood, located in a semi-arid region in north west of Iran. Soil erodibility factor was measured at the unit plots under natural rainfall events in 36 different lands in the study area from March 2005 to March 200...
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