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一、海河平原地理特征海河平原位于北纬36°03′—39°37′,东经114°13′—117°51′。北与北京市、天津市相邻,西与太行山(等高线100米为界)相接,南、东南与河南省、山东省相邻,东邻渤海。面积为62,122KM~2,占河北省总面积的33%海河平原是由海河、古代黄河洪积冲积而成。海拔高度100米至2米,由北、西、西南向渤海倾斜。海河平原根据高度和沉积物不同可分为(太行山)山前平原、冲积低平原、滨海平原三部分。通常把冲积低平原和滨海平原统称为黑龙港低平原。山前平原是由太行山流出的十数条河流在山前地带形成的冲积扇以及山坡上的坡水堆积作用与间歇性小河在山地带形成的洪积扇、洪积裙共同组成的,其中以冲积扇为主体。相连而成的山前平原,海拔高度在100—10米之间,总坡降在1/100C—1/10000之间。这平原南北向横截面呈波浪形,每个冲积扇的前缘堆积较薄,相邻两个冲积扇
I. Geographical Features of the Haihe Plain The Haihe Plain lies at 36 ° 03’-39 ° 37 ’north and 114 ° 13’-117 ° 51’11 east. North and Beijing, Tianjin adjacent to the West and the Taihang Mountains (contour 100 meters for the community) phase, south and southeast and Henan Province, Shandong Province, adjacent to the east Bohai Sea. The area is 62,122KM ~ 2, accounting for 33% of the total area of Hebei Province. The Haihe River Plain is formed by the alluviation of the Haihe River and the ancient Yellow River. 100 meters above sea level to 2 meters, from the north, west and southwest tilt to the Bohai Sea. Haihe Plain, according to the different height and sediment can be divided into (Taihang Mountains) piedmont plain, low alluvial plain, coastal plain three parts. The alluvial low plain and the coastal plain are generally collectively referred to as the Heilonggang low plain. The piedmont plain consists of alluvial fan formed in the piedmont belt by ten rivers flowing out of the Taihang Mountains and the accumulation of slope water on the hillside and the alluvial fan and alluvial fan formed in the mountainous zone by intermittent streams. Alluvial fan as the main body. Piedmont Piedmont plain, the altitude of 100-10 meters, the total gradient in 1 / 100C-1/10000 between. The plain has a wavy cross-section in the north-south direction. The leading edge of each alluvial fan is relatively thin and adjacent to two alluvial fans