A wavelet perspective on variabilities of hydrological processes in conjunction with geomorphic analysis over the Pearl River basin in South China
A wavelet perspective on variabilities of hydrological processes in conjunction with geomorphic analysis over the Pearl River basin in South China
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华南珠江流域水文过程变异的小波视角与地貌分析
DOI：
10.1016/j.jhydrol.2016.09.017
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发表时间：
2016-11
影响因子：
6.4
通讯作者：
Ji Chen
中科院分区：
文献类型：
--
作者：
Jun Niu;Ji Chen
流域对陆地水文过程降水变率的响应可能表现在不同的时间尺度上，并且因流域而异。对自然变率调制的定量把握对于描述流域趋势或洪涝和干旱脆弱性是可取的;然而，量化并不总是直截了当的。利用大尺度水文模型--变入渗能力（维克）模型，获得了珠江流域10个子流域1952-2000年的水文时间序列（径流、土壤水分和蒸散量）。利用连续小波变换分析了流域性极端事件的时间尺度特征和相关的多尺度变化。应用小波相干分析和秩相关分析方法，对水文过程月距平的相关性进行了检验。结果表明，径流量与降水量的相关性最强，蒸散量对降水量的响应相对较小。分析结果表明，珠江流域径流对降水变化的衰减作用主要集中在2年时间尺度内。土壤水分的变异可以将降水的变异沿着时间尺度扩展。通过对陆地水文过程变异性特征的认识，提出了一种基于小波变换的地貌指数--流域形状因子（FF），它可以反映降水变异的高频和低频响应。结果发现，对于一个子流域具有较高的FF值，降水变率可以表示更多的径流变率在小于2年的时间尺度，这样的子流域容易有严重的洪水。由于FF值较低，子流域对土壤湿度的记忆较长，导致干旱期间发生严重干旱。这一发现对于评估珠江流域水旱灾害的发生趋势具有重要的参考价值，并可推广到地球仪的其他流域。
Basin response to precipitation variability by terrestrial hydrological processes may be manifested at different timescales and vary from one basin to another. A quantitative grasp of natural variability modulation is desirable for characterizing basin tendency or vulnerability on floods and droughts; quantification is not always straightforward, however. Using a macro-scale hydrological model, the Variable Infiltration Capacity (VIC) model, the hydrological time series (runoff, soil moisture, and evapotranspiration) were obtained for the 10 sub-basins over the Pearl River basin in South China for the period 1952–2000. A continuous wavelet transform was used to identify the characteristics of the temporal scales of basin-featured extreme events and related multiple-scale variabilities. By use of wavelet coherence analysis and rank correlation method, the cross correlations of monthly anomalies of hydrological processes were examined. The results showed that the runoff correlated most with, and the evapotranspiration had less response to, the precipitation variability. The analyzed results revealed that the attenuation effect of runoff in response to precipitation variability was mainly within the timescale of 2 yr in the Pearl River basin. The soil moisture variability can extend precipitation variation along with timescales. With understanding of the variability features of the terrestrial hydrological processes, this paper showed one geomorphic index, a basin form factor (FF), can represent the wavelet-based indices for high- and low-frequency responses to precipitation variability. It was found that, for a sub-basin with a higher FF value, precipitation variability can be represented more by runoff variability at less than 2-yr timescales; such a sub-basin is apt to have serious floods. With a lower FF value, a sub-basin has longer memory of soil moisture, leading to severe droughts during dry periods. This finding would be valuable to evaluate the tendency on occurrence of floods and droughts in the Pearl River basin, a humid region, which may be transferable to other basins in the globe.
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影响因子：
5.4
作者：
D. Markovic;M. Koch
通讯作者：
D. Markovic;M. Koch
影响因子：
3.9
作者：
Shurong Zhang;Xixi Lu;D. Higgitt;C. Chen;Jingtai Han;Huiguo Sun
通讯作者：
Shurong Zhang;Xixi Lu;D. Higgitt;C. Chen;Jingtai Han;Huiguo Sun
DOI：
10.1111/j.1469-8137.2008.02544.x
发表时间：
2008-09
期刊：
The New phytologist
影响因子：
--
作者：
B. Waters;M. Grusak
通讯作者：
B. Waters;M. Grusak
影响因子：
4.9
作者：
Nakken, M
通讯作者：
Nakken, M
DOI：
--
发表时间：
1995
期刊：
Acta Crystallographica Section E: Structure Reports Online
影响因子：
--
作者：
REN-JUN Zhao;Zuang YI-LIN;XIN-REN Liu
通讯作者：
REN-JUN Zhao;Zuang YI-LIN;XIN-REN Liu