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Connotation of Waterway Bearing Capacity and Its Evaluation Method
—— Taking the Upper Yangtze River as an Example
LI Wenjie1, LI Weiming2, YANG Shengfa1, YANG Wei1, WANG Dawei2
2019, 38(10):
74-80.
DOI: 10.3969/j.issn.1674-0696.2019.10.12
Bearing capacity is an important basis for social and economic development planning, but the connotation of waterway bearing capacity is not yet clear, and there is also lack of evaluation research on waterway bearing capacity. The analysis of the definition of various bearing capacity showed that its connotation included four elements: bearing body, bearing object, bearing condition and bearing capacity index. Based on this, four factors of waterway bearing capacity were discussed and defined as: within a certain period of time, within a certain river section, the waterway bearing capacity of social and economic sustainable development at a certain scale. The balance index of supply and demand of waterway bearing capacity was proposed as bearing capacity index to evaluate the waterway bearing capacity, that is, the ratio of economy-driven shipping demand to waterway transit capacity. Taking the waterway of the upper Yangtze River as an example, the bearing capacities of three reaches named Yibin-Chongqing, Chongqing-Fuling and Fuling-Yichang were estimated and evaluated, which showed that the bearing capacity of the upper Yangtze River was currently approaching saturation, and the waterway upgrading was urgently needed to meet the sustainable social and economic development in the future. The maximum exploitable water scale was estimated, which indicated that there was a certain improvement potential in the waterway. The case study of the upper reaches of the Yangtze River shows that the proposed connotation and evaluation method of the waterway bearing capacity have a certain applicability, which can provide supports for the planning and construction of the waterway.
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