气候驱动的基岩切口在一个活跃的山脉带
Karen Hartshorn1, Niels Hovius, W Brian Dade
1Department of Earth Sciences, Institute of Theoretical Geophysics, University of Cambridge, Downing Street, Cambridge, CB2 3EQ, UK.
概括
中等强度的河流在台湾驱动山谷下降. 由悬浮沉积物和岩石弱点造成的磨损是河流侵蚀的关键因素.
科学领域:
- 地质形态学 地质形态学
- 地球科学 地球科学 地球科学
- 水文学的水文学
背景情况:
- 了解岩基切口对于量化景观演变至关重要.
- 台湾提供了一个独特的自然实验室,已知挖掘和河流排放率.
研究的目的:
- 为了调查河流基岩切割的驱动因素.
- 为了确定流量强度和沉积物磨损在山谷降低中的作用.
- 评估岩石结构对侵蚀的影响.
主要方法:
- 河流基岩切口的亚毫米精度测量.
- 台湾东中山脉的实地研究.
- 分析已知的独立挖掘率和河流排放.
主要成果:
- 谷谷的降低主要是由频繁,中等强度的河流流动所驱动的.
- 悬浮沉积物的磨损是河流磨损的一个重要过程.
- 运河床的几何结构和岩石的弱点控制着侵蚀速度和风格.
结论:
- 侵蚀动态是由流量,沉积物运输和地质结构的组合控制的.
- 这些发现提供了对基石河流切割机制的见解.
更多相关视频
08:09Measuring and Mapping Patterns of Soil Erosion and Deposition Related to Soil Carbonate Concentrations Under Agricultural Management
Published on: September 12, 2017
13:38Laser-Induced Fluorescence Emission (L.I.F.E.) as Novel Non-Invasive Tool for In-Situ Measurements of Biomarkers in Cryospheric Habitats
Published on: October 26, 2019
相关概念视频
What is Climate?
Climate refers to the prevailing weather conditions in a specific area over an extended period. As the saying goes, “Climate is what you expect. Weather is what you get.” Climate is influenced by geographic factors, such as latitude, terrain, and proximity to bodies of water.
Global Climate Change
Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
Isothermal Processes
A thermodynamic process that occurs at constant temperature is called an isothermal process. Heat slowly flows into the system or out of the system to maintain thermal equilibrium. Processes involving phase changes like water evaporation into steam or freezing water into ice at a constant temperature are examples of Isothermal Processes.
An ideal gas can also undergo isothermal expansion or compression.
For example, consider 1 mole of an ideal gas inside an isolated cylinder at initial volume V...
An ideal gas can also undergo isothermal expansion or compression.
For example, consider 1 mole of an ideal gas inside an isolated cylinder at initial volume V...
Magnetostatic Boundary Conditions
An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
Frictional Forces on Flat Belts
Flat belts are commonly used in various industrial applications for transmitting power from one pulley to another. When a flat belt is wrapped around a set of pulleys, it experiences different tensions at the driving pulley ends due to the friction between the belt and pulley surface. When the pulley moves in a counterclockwise direction, the tension T2 on the opposite side of the pulley where the belt is moving away from is higher than the tension T1 on the side where the belt is moving...
Temperature Dependent Deformation
In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added together...
