OALib Journal期刊
ISSN: 2333-9721
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半干旱地区地表水平衡的特征和模拟
DOI: 10.11821/xb200406020, PP. 964-971
Keywords: 半干旱草原,地表水文过程,陆面过程数值模拟,雪盖模型
Abstract:
作者分析了我国半干旱区草原典型地区的水量平衡的特点。由于地处东亚季风区和西风带的过渡带,降水主要集中在夏季,且多短时间对流性降水,其中绝大部分消耗于蒸发,地表径流很少,土壤比较干燥。冬季积雪,春季融雪集中,能产生较强的径流,这与夏季降水形成的径流构成双峰型特征,在我国半干旱区较为典型。由于这些特点,在地表水量平衡的计算和模拟中,蒸发的估算十分重要,为此在植被-大气相互作用模式(AVIM)中对水文过程作了改进,模式中包含了大气—植被—土壤间的能量和水分传输过程,特别是半干旱区地表蒸发和植被的蒸腾过程作了比较细致的处理,考虑了蓄满和超渗两种产流机制,同时采用了一个简化的雪盖模型。以此模型模拟了内蒙古半干旱草原上锡林河流域的地表水文过程。计算结果显示,半干旱区地表水平衡,蒸发大而径流小及产流的春夏双峰型特征都能很好地模拟。这些过程的参数化方案也适用于非干旱区。
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