| 基于多源数据分析维多利亚湖流域水储量变化 |
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| 引用本文： | 万祥禹,游为,王海波,范东明.基于多源数据分析维多利亚湖流域水储量变化[J].地球物理学报,2021,64(2):441-454. |
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| 作者姓名： | 万祥禹 游为 王海波 范东明 |
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| 作者单位： | 西南交通大学地球科学与环境工程学院,成都611756;西南交通大学地球科学与环境工程学院,成都611756;西南交通大学地球科学与环境工程学院,成都611756;西南交通大学地球科学与环境工程学院,成都611756 |
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| 摘 要： | 本文利用CSR发布的GRACE RL06时变重力场模型,结合两种水文模式、卫星测高、降雨和蒸散等多源数据,从多个角度综合系统地分析维多利亚湖流域2003-01—2017-06的陆地水储量变化.比较了正向建模方法和单一尺度因子对泄漏误差的改正效果,经对比采用正向建模方法在此流域效果更好.基于多源数据得出以下三点与此前研究不同的结论:(1)GRACE RL06版本数据探测到流域内的水储量在2003-01—2017-06呈增加趋势,球谐位系数和Mascon产品得到的变化速率分别为14.9 mm·a^-1和16.7 mm·a^-1,观测误差小于RL05版本的结果,RL05版本低估了流域水储量的变化速率;(2)2013-01—2016-02期间GRACE和测高探测到湖泊水量增长,而水文模式探测到流域内水储量减少,推测这一现象由大坝蓄水造成;(3)受El Nino事件影响,2016-03—2017-06流域降雨减少,流域水储量减少,GRACE球谐位系数和Mascon探测到的变化速率分别为-100.3 mm·a^-1和-129.7 mm·a^-1.本文结果表明卫星观测数据可为在缺乏直接观测数据的情况下分析人类活动和自然变化对区域水储量的影响提供一种可行的途径,这也为研究我国湖泊流域水储量变化提供参考.
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| 关 键 词： | GRACE 陆地水 正向建模 维多利亚湖流域 |
Terrestrial water storage variations in Lake Victoria Basin from multi-source data |
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| WAN XiangYu,YOU Wei,WANG HaiBo,FAN DongMing.Terrestrial water storage variations in Lake Victoria Basin from multi-source data[J].Chinese Journal of Geophysics,2021,64(2):441-454. |
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| Authors: | WAN XiangYu YOU Wei WANG HaiBo FAN DongMing |
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| Affiliation: | (Faculty of Geosciences and Environmental Engineering,Southwest Jiaotong University,Chengdu 611756,China) |
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| Abstract: | In this paper,GRACE Release-06 monthly time-variable gravity field released by CSR,satellite altimetry data,land surface model data,precipitation data and evaporation data from January 2003 to June 2017 over the Lake Victoria Basin are used to analyze the spatiotemporal variability of terrestrial water storage(TWS),and compare the effect of forward modeling method and basin scale factor method on the correction of leakage error in the basin.Our analysis indicates that the forward modeling method can correct leakage errors effectively,which is applied to recover the signal attenuation caused by leakage in our study.By using the GRACE Release-06 satellite gravity products,a significant increase trend is detected in the basin from January 2003 to June 2017,the estimated rates from spherical harmonic coefficient products and Mascon products are 14.9 mm·a^-1 and 16.7 mm·a^-1,respectively.The observation error from GRACE Release-06 projects is smaller than that of Release-05,while the results from Release-05 underestimated the change rate of water storage.From January 2013 to February 2016,both satellite gravimetry and satellite altimetry detect water storage increase over the Lake Victoria Basin while hydrological models show a decrease which is speculated to be caused by dam impoundments.Influenced by El Nino events,rainfall in the basin decreased,which further cause the terrestrial water storage decrease from March 2016 to June 2017.During this period,the decrease trend in TWS detected by GRACE spherical harmonic coefficient products and Mascon products was-100.3 mm·a^-1 and-129.7 mm·a^-1,respectively.The results of our study show that satellite observations can provide a feasible way to analyze the impact of human activities and natural changes on regional water storage change in the absence of direct in-situ observation data,which also provides a reference for studying the variations of water storage in lake basins in China. |
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| Keywords: | GRACE Terrestrial Water Storage Forward Modeling Lake Victoria Basin |
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