【摘要】 研究证明,河北平原在各个时期的平均沉积速率分别为:早更新世（Q₁）0.081毫米/年,中更新世（Q₂）0.34毫米/年,晚更新世（Q₃）1.46毫米/年,全新世（Q₄）3.52毫米/年,近五十年来8.2毫米/年.根据近五十年来平原的淤积速率计算将来各地貌单元的演变趋势表明,白洋淀的深度将越来越小,大约再需350年时间将被淤死填平,而文安洼的深度可能越来越大.更多还原

【Abstract】 The rate of deposition in the Hebei Plain at different times has been studied in this paper, and the trend of evolution has been estimated on the basis of the rate of deposition during the recent 50 years. The investigation shows that the mean rate of deposition is 0.081 mm/yr in the early-Pleistocene Epoch, 0.34 mm/yr in the mid-Pleistocene Epoch, 1.46 mm/yr in the late-Pleistocene Epoch, 3.52 mm/yr in the Holocene Epoch and 8.2 mm/yr during the recent 50 years. The thickness in the Quaternary System is mainly controlled by the geologic structure, whereas that of recent years is chiefly controlled by the conditions of water, sediment and landforms in the plain. The acceleration of deposition and regional changes of the thickness in this area are mainly caused by geologic structure, neotectonic movement, artificial effects, as well as conditions of water and sediment.The processes of depositional formation in the plain can be divided into five controlling stages, namely, basal structure, neotectonic movement, quasi-parallel rising, acceleration of deposition and artificial effects.According to the net rate of deposition in the recent 50 years, the calculations of the trends of evolution for various geomorphic units show that in the next 350 years, Baiyangdian will become shallower and will be filled up, while the depth of Wen’anwa will increase.The principal reasons of the different trend of evolution in the various geomorphic units in the Hebei Plain are the difference of the rate of deposition in the various geomorphic units, the effects of the trend of evolution of the landforms around them and the difference of the crust subsidence in the plain.After next 350 years, the principal place of deposition will transit from Baiyangdian to Wen’anwa and Dongdian because Baiyangdian will have filled up.Thus the rate of deposition in Wen’anwa will greatly increase, whereas that of the areas around will be constant. It is possible that Wen’anwa will become shallower and will be filled up.更多还原