黄土高原的沟壑化,给农业生产、交通运输以及人民的日常生活带来了诸多不便。
The ravines and gullies of the loess plateau have brought much inconvenience to the agricultural production, transportation and people’s daily life.
(二)黄河是填造华北平原的主要力量,黄河从黄土高原上带来的大量泥沙对华北平原的形成及其上面的水系的变迁起着主导作用
The Yellow River is the main builder of the North China Plain. The great deal of silt carried by the Yellow River from the loess plateau makes a major contribution to the formation of the North China Plain and its transition of water system.
1.华北平原为中国第二大平原,位于黄河下游,地质构造上主要属于新生代的巨大坳陷
As the second largest plain in China, the North China Plain is located at the lower reaches of the Yellow River and in geological structure it is a mega-depression tectonics of Cenozonic Era.
华北平原西起太行山脉和豫西山地,东到黄海、渤海和山东丘陵,北起燕山山脉,西南到桐柏山和大别山,东南至苏、皖北部,与长江中下游平原相连。
延展在北京市、天津市、河北省、山东省、河南省、安徽省和江苏省等7省、市的境域。面积约30万km2。主要由黄河、淮河、海河、滦河冲积而成,故又称黄淮海平原。
The North China plain covers an area of about 300,000 km2. Its boundaries begins from Mt. Taihang and mountainous regions of western Henan province in the west to Huanghai Sea, Bohai Sea, and Shandong Upland in the east, and from Mt.Yan in the north to Tongbai Shan and Dabie Shan in the southwest and the northern part of Jiangsun province and Anhui province in the southeast bordered upon the Yangtze river Plain. It ranges across cities and provinces such as Beijing, Tianjin, Hebei, Shandong, Henan, Anhui, and Jiangsu. As an alluvial plain by the Yellow River, River Huai, River Hai, and River Luan, it is also called the Huang Huai Hai Plain.
华北平原地理位置(图)
The geographic location of the North China Plain
2.黄河自古多洪泛,从公元前602年(夏禹时期)到1946年,黄河中下游干流基本上是“两年一决口,百年一改道”(决口泛滥1593次,较大的改道为26次),成为淤造黄淮海平原的中坚力量
History has witnessed lots of floods on the Yellow River. From 602 BC to 1946, there were 1593 water bursts and 26 major changes of
riverways on the middle and lower reaches. That’s to say, Water bursts took place every two years and the riverway had to be changed every century. The yellow river thus became a nucleus power in silting the Huang Huai Hai Plain.
3.根据建国后的统计,黄河每年从黄土高原上带来16亿吨,估计其中的3/4淤积在入海口附近,1/4淤积在下游河道里
这样,河床迅速填高,每到洪水季节,经常造成洪水泛滥,泥沙随洪水泻出河床,在平原上沉积,从而形成了华北平原。
According to statistics after the foundation of the PRC, each year the yellow river takes away from the loess plateau 1.6 billion tons of sand, of which 3/4 silts at the sea port and the rest of which silts in the riverways of the lower reach.
Therefore, the riverbed were rapidly filled up high and caused overflow in the flood season. The mud and sand outpoured together with the flood silted on the plain and consequently created the North China Plain.
4.华北平原地势低平(大部分海拔50米以下),自西向东微斜,平原多低洼地、湖沼,土层深厚,土质肥沃,沉积厚度1500~5000米左右
The North China Plain has a low topography with most parts having an altitude less than 50 meters. It has a west end slightly higher than the east. There are many bottomlands and lakes on the plain. With sediment of 1500~5000 meters, the north china plain has rich soil and thick soil layers.
黄河下游几乎周期性地泛滥、决口、改道,造成了广阔而肥沃的冲积平原。正是在这片黄色的原野,我们的先民创造了旱作农业文化,辉煌灿烂。黄河以她柔韧博大的胸怀哺育了黄河文明的先民,成就了黄炎部族和其他部族文明的大融合,这是我们民族的母亲河。
The lower reach has an almost periodical flood, burst, and riverway change and thus silted into a vast and rich alluvial plain. It was on this yellow land that our ancestors cultivated the crucial dry farming culture. This is our nation’s mother river___ the Yellow River, who with her flexile and breadth of vision nurtured the yellow river civilization, and realized the union of the Yanhuang nation and other nationalities.
华北平原景观(图)
Sight of the North China Plain
5.目前黄河仍在不停地“造陆”,地处黄河入海口的黄河三角洲也成为共和国新增土地最快的地区
At present, the Yellow River is undergoing constant “land-making”. And the Yellow River Delta at the seaport of the river also becomes a region with the fastest growing of new land in China.
黄河、海河、滦河等河流将大量泥沙堆积于沿海地带,使长期处于沉降的渤海凹陷不断被充填,平原不断向海湾伸展,堆积物质主要从黄河供给,渤海湾与莱州湾之间,黄河三角洲呈扇状突出。
Large sum of mud and sand from the Yellow River, River Huai, and River
Luan is accumulated at the seaside area, which fills up the Bohai Sea hollow that is in sedimentation all the time. The plain is extending itself toward the gulf. Between the Bohai Sea and the Laizhou Gulf, the Yellow River Delta stands out in the shape of a fan.
渤海凹陷的西南部为黄河三角洲。近百年来,黄河尾闾河段较大的摆动改道约13次,在这里填海造陆面积2300 km2,平原还不断地向海洋延伸,平均每年2~3km不等。
The Yellow River Delta lies in the southwest of the Bohai Sea hollow. In the past hundreds of years, there were 13 times major riverwayschange at the trail of the Yellow River. 2300 km2 of land has been created by filling in the sea. The plain is still constantlty extending toward the sea at a speed about 2~3km per year.
黄河三角洲景观(图)
Sight of the Yellow River Delta