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西江中上游型洪水影响下龙滩水库调度特性初探 被引量:3
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作者 方神光 崔丽琴 +1 位作者 张文明 张康 《人民长江》 北大核心 2017年第18期6-10,38,共6页
为探讨龙滩水库对西江中上游型洪水的防洪削峰作用,选取"96·7"中上游型洪水作为典型洪水,拟定4种龙滩水库调度方案,采用率定和验证后的西江中游河网及梯级水库水动力数学模型,分别对典型洪水及频率为0.2%、1%和2%水文条... 为探讨龙滩水库对西江中上游型洪水的防洪削峰作用,选取"96·7"中上游型洪水作为典型洪水,拟定4种龙滩水库调度方案,采用率定和验证后的西江中游河网及梯级水库水动力数学模型,分别对典型洪水及频率为0.2%、1%和2%水文条件下的4种梯级水库调度方案进行了模拟计算和分析。结果显示,该水动力学模型能很好地模拟洪水特性参数的时间变化规律以及水库的运行调度过程;对于"96·7"典型中上游型洪水,由于红水河洪水较小,梧州断面流量以柳江来水为主,龙滩水库调度对梧州断面削峰效果有限;但针对中上游型不同频率的大洪水,采用提前启用龙滩水库的调度方案能有效削减梧州断面的洪峰值;其中,龙滩水库采用发电流量控泄的方案可以达到防洪和发电效益的统一。 展开更多
关键词 防洪调度 洪峰削减 水动力模拟 龙滩水库 梯级水库 西江中上游型洪水
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西江中上游人工次生林凋落物水文效应 被引量:2
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作者 梁远楠 《广东林业科技》 2011年第4期27-31,共5页
在西江中上游肇庆市德庆三叉顶市级自然保护区,对人工次生林不同坡向的凋落物水文效应进行了研究,结果如下:(1)凋落物持水率与浸泡时间存在对数曲线关系,而凋落物吸水速率与浸泡时间呈指数函数关系;不同森林类型凋落物持水率和吸水速率... 在西江中上游肇庆市德庆三叉顶市级自然保护区,对人工次生林不同坡向的凋落物水文效应进行了研究,结果如下:(1)凋落物持水率与浸泡时间存在对数曲线关系,而凋落物吸水速率与浸泡时间呈指数函数关系;不同森林类型凋落物持水率和吸水速率随时间的动态变化规律基本相似;(2)不同坡向林分凋落物最大持水率的大小顺序为:东南坡(172.34%)>东北坡(161.88%)>北坡(152.57%)>西南坡(150.20%)>西北坡(134.05%)>东坡(133.55%)>西坡(129.67%)>南坡(122.34%)。而不同坡向林地的最大持水量的大小顺序为:东南坡(20.25%)>东北坡(19.74%)>西北坡(16.52%)>东坡(16.32%)>北坡(15.17%)>西南坡(14.66%)>西坡(14.42%)>南坡(14.20%)。 展开更多
关键词 西江中上游 人工次生林 凋落物 水文效应
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A Landscape Pattern Analysis Method Based on Boundaries and Nodes:A Case Study in Upper Minjiang River,China 被引量:3
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作者 WEN Qingchun LI Xiuzhen +5 位作者 HE Hongshi HU Yuanman CHEN Xin CHANG Yu WANG Wei BU Rencang 《Chinese Geographical Science》 SCIE CSCD 2014年第1期50-59,共10页
Traditionally,patch-based analysis at the landscape scale fragmentation has been used in the study of landscape ecology while the study of boundary and node has not been considered as much detail until recently.This s... Traditionally,patch-based analysis at the landscape scale fragmentation has been used in the study of landscape ecology while the study of boundary and node has not been considered as much detail until recently.This study investigated the possibility of applying boundary-and node-based methods in landscape pattern analysis to the upper reaches of the Minjiang River in the southwestern China.Boundary-based and node-based landscape indices were selected to be used in analyzing changes in landscape patterns,and the results were compared with analysis using traditional pattern indices.We compared the responses of patch-area-based,boundary-length-based and node-number-based indices,and concluded that boundary-based and node-based indices are more sensitive to disturbance than patch-based indices with various patterns,and node-based indices are even more sensitive than boundary-based ones.Thus,the results suggest that boundary-based and node-based pattern analysis methods provide helpful supplementary information to traditional patch-based pattern analysis methods.The results about pattern dynamics of landscapes in the upper reaches of the Minjiang River based on boundaries and nodes showed that with human disturbance,the dominance of forest landscape was weakened by other landscape types;thus the landscape pattern of the study area became more homogeneous and the boundary network became more complex.These changes further augmented disturbance interfaces in the landscape and increased the possibilities of further landscape fragmentation. 展开更多
关键词 LANDSCAPE pattern index PATCH BOUNDARY NODE Minjiang River
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