| 刘晓燕,杨胜天,金双彦,罗娅,周旭.黄土丘陵沟壑区大空间尺度林草植被减沙计算方法研究[J].水利学报,2014,45(2): |
| 黄土丘陵沟壑区大空间尺度林草植被减沙计算方法研究 |
| The method to evaluate the sediment reduction from forest and grass land over large area in the loess hilly area |
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| DOI： |
| 中文关键词: 黄土丘陵沟壑区 林草 减沙 计算方法 |
| 英文关键词: loess hilly area forest and grass sediment reduction calculation method |
| 基金项目: |
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| 摘要点击次数: 2651 |
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| 中文摘要: |
| 依靠20世纪后期遥感影像数据、过去近60a的实测水文和气象数据、黄河水沙变化现有研究成果等，引入产沙系数和基于遥感影像的林草植被覆盖率概念，提出基于遥感数据、可支持大空间尺度计算的黄土丘陵区林草植被减沙量评价模型，并给出模型应用中几个关键问题的处理方法。分析认为，在林草植被覆盖率小于35%~40%的范围内，改善林草的减沙效果非常明显；林草植被覆盖率达60%以后减沙效果趋于稳定，雨强对产沙的影响权重亦不再明显。 |
| 英文摘要: |
| According to the satellite images， hydrological and meteorological data in the past six decades and the achievements in the runoff/sediment variation study， the concepts of sediment yielding coefficient and vegetation coverage ratio based on remote sensing images are introduced to set up a method， which can evaluate the effects of sediment reduction from forest and grass land over large area in the loess hilly area. The effect of sediment reduction is obvious in improving the coverage of vegetation when the coverage ratio is less than 35%-40%. The effect of sediment reduction tends to be stable and the weight of rainfall intensity is little when vegetation coverage is about 60%. |
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