barchan

简明释义

英[ˈbɑr.kæn]美[ˈbɑr.kæn]

n. 新月形沙丘

adj. 呈新月形流动的；具有新月形沙丘性质的

英英释义

单词用法

同义词

反义词

例句

1.It is known for its dramatic dunes, including the crescent-shaped barchan dunes shown here, some of which can reach 100 feet (30 meters) high and 1,200 feet (370 meters) wide.

这里因有着壮观的沙丘而知名，比如图中的这些半月状的弧形沙丘，有些沙丘甚至可高达100英尺(30米)，宽达1,200英尺(370米)。

2.It is known for its dramatic dunes, including the crescent-shaped barchan dunes shown here, some of which can reach 100 feet (30 meters) high and 1,200 feet (370 meters) wide.

这里因有着壮观的沙丘而知名，比如图中的这些半月状的弧形沙丘，有些沙丘甚至可高达100英尺(30米)，宽达1,200英尺(370米)。

3.These strangely shaped dunes are known as barchan dunes and are common on both Earth and Mars.

形状怪异的沙丘是地球和火星上比较常见的新月沙丘。

4.Photographers flocked to capture the stunning beauty of the barchans at sunset.

摄影师们蜂拥而至，捕捉日落时分巴尔汉的惊艳之美。

5.The barchans formed along the coastline, shaped by the constant ocean breeze.

在海岸线形成的巴尔汉，是受到不断海风的影响而成的。

6.Hikers navigated carefully around the barchans to avoid getting stuck in the soft sand.

徒步旅行者小心翼翼地绕过巴尔汉，以避免陷入松软的沙子中。

7.Researchers studied the movement of barchans to understand wind patterns in arid regions.

研究人员研究了巴尔汉的移动，以了解干旱地区的风向模式。

8.The desert landscape was dotted with numerous barchans, which are crescent-shaped sand dunes.

沙漠景观中点缀着许多巴尔汉，这些是新月形的沙丘。

作文

The world is full of fascinating geographical formations, and one of the most intriguing among them is the barchan. A barchan is a type of sand dune that is characterized by its crescent shape, with the tips of the crescent pointing downwind. These dunes are formed by the action of wind on loose sand and are typically found in arid regions where there is limited vegetation to stabilize the sand. The study of barchans offers insights into the dynamics of desert landscapes and the processes that shape them.In many deserts around the world, barchans can be seen shifting and changing shape as the wind blows. They can grow larger over time, sometimes reaching heights of several meters. The movement of barchans is not random; they tend to migrate in the direction of the prevailing winds. This migration can be quite rapid, with some barchans moving several meters each year. This unique characteristic makes them an interesting subject of study for geologists and environmental scientists.One of the reasons barchans are so captivating is their role in the ecosystem. Although they may seem barren at first glance, these dunes can support a variety of life forms. Certain plants have adapted to thrive in the sandy environment created by barchans, and these plants play a crucial role in stabilizing the sand, preventing erosion and providing habitats for small animals. The presence of vegetation can also influence the shape and size of barchans, as roots help to anchor the sand in place.The formation of barchans is a perfect example of how natural forces interact to create unique landscapes. Wind erosion and deposition are key processes in the development of these dunes. As the wind blows, it picks up grains of sand and carries them along, eventually depositing them in areas where the wind speed decreases. Over time, this process leads to the accumulation of sand and the formation of the distinctive crescent shape of barchans.Furthermore, barchans can also serve as indicators of wind patterns in a given area. By studying their orientation and movement, scientists can gain valuable information about local weather conditions and changes in the environment. This knowledge is essential not only for understanding desert ecosystems but also for predicting how these environments may change in the face of climate change.In conclusion, barchan dunes are more than just piles of sand; they are dynamic structures that play a significant role in desert ecology and geology. Their unique shapes and behaviors provide a window into the complex interactions between wind, sand, and life in arid environments. As we continue to explore and study these fascinating formations, we gain a deeper appreciation for the natural world and the processes that shape our planet. Understanding barchans helps us recognize the importance of preserving these delicate ecosystems and the rich biodiversity they support.

世界上充满了迷人的地理形态，其中最引人入胜的之一就是barchan。barchan是一种沙丘，具有弯月形状，弯月的尖端朝向下风面。这些沙丘是由风对松散沙子的作用形成的，通常在植被稀少的干旱地区发现。研究barchans为我们提供了有关沙漠景观动态及其形成过程的见解。在世界许多沙漠中，可以看到barchans随着风的吹动而移动和改变形状。它们可以随着时间的推移而变得更大，有时高度可达几米。barchans的移动并不是随机的；它们往往朝着盛行风的方向迁移。这种迁移可能相当迅速，一些barchans每年移动几米。这一独特特征使它们成为地质学家和环境科学家研究的有趣课题。barchans之所以如此迷人，是因为它们在生态系统中的作用。尽管乍一看它们似乎荒凉，但这些沙丘能够支持多种生命形式。某些植物已经适应了在barchans所创造的沙质环境中生存，这些植物在稳定沙子、阻止侵蚀和为小动物提供栖息地方面发挥着关键作用。植被的存在也可以影响barchans的形状和大小，因为根系帮助固定沙子。barchans的形成是自然力量如何相互作用以创造独特景观的完美例子。风蚀和沉积是这些沙丘发展的关键过程。当风吹过时，它会拾起沙粒并将其带走，最终将其沉积在风速减小的区域。随着时间的推移，这一过程导致沙子的积累，并形成barchans特有的弯月形状。此外，barchans还可以作为特定区域风模式的指示器。通过研究它们的方向和移动，科学家可以获得有关当地天气条件和环境变化的宝贵信息。这一知识对于理解沙漠生态系统至关重要，同时也有助于预测这些环境在气候变化面前可能发生的变化。总之，barchan沙丘不仅仅是沙堆；它们是动态结构，在沙漠生态学和地质学中发挥着重要作用。它们独特的形状和行为为我们提供了一个窗口，让我们了解风、沙与干旱环境中生命之间复杂的相互作用。随着我们继续探索和研究这些迷人的形态，我们对自然世界及其塑造我们星球的过程有了更深刻的认识。理解barchans帮助我们认识到保护这些脆弱生态系统及其所支持的丰富生物多样性的重要性。