干旱区地理 ›› 2021, Vol. 44 ›› Issue (5): 1373-1383.doi: 10.12118/j.issn.1000–6060.2021.05.18
任才1,2(),龙爱华1,2(),於嘉闻1,2,尹振良3,张继1,2
收稿日期:
2020-09-21
修回日期:
2020-11-18
出版日期:
2021-09-25
发布日期:
2021-09-22
通讯作者:
龙爱华
作者简介:
任才(1995-),男,硕士研究生,主要从事水文水资源方向的研究. E-mail: 基金资助:
REN Cai1,2(),LONG Aihua1,2(),YU Jiawen1,2,YIN Zhenliang3,ZHANG Ji1,2
Received:
2020-09-21
Revised:
2020-11-18
Online:
2021-09-25
Published:
2021-09-22
Contact:
Aihua LONG
摘要:
以叶尔羌河流域上游河源区为研究区,构建嵌入了冰川模块的SWAT分布式水文模型,对卡群水文站1968-2017年逐月径流进行模拟,评价该模型在研究区内的适用性,基于模拟结果分析研究区冰川径流年际变化与年内分布情况,并定量核算气候和下垫面变化对径流变化的贡献率。结果表明:该模型在研究区径流模拟中具有良好的适用性,校准期(1968-1992年)与验证期(1993-2017年)的决定系数(R2)分别为0.77和0.86,纳什系数(NSE)分别为0.76和0.85,均方根误差与实测值标准差的比值(RSR)分别为0.49和0.38,偏差百分比(PBIAS)分别为-7.4%和0.6%。经模拟,研究区近50 a冰川径流量总体呈增加趋势,且其占总径流量的比重约为51.1%;年内冰川产流主要发生在6-9月,占全年冰川径流量的90.0%以上。气候和下垫面变化分别使月径流量增加6.62 m3·s-1和0.41 m3·s-1,其中气候变化的贡献率为94.2%,即气候变化对研究区径流的影响占主导地位。研究成果可为理解研究区的历史径流变化成因及预测未来径流的演变趋势提供科学依据。
任才,龙爱华,於嘉闻,尹振良,张继. 气候与下垫面变化对叶尔羌河源流径流的影响[J]. 干旱区地理, 2021, 44(5): 1373-1383.
REN Cai,LONG Aihua,YU Jiawen,YIN Zhenliang,ZHANG Ji. Effects of climate and underlying surface changes on runoff of Yarkant River Source[J]. Arid Land Geography, 2021, 44(5): 1373-1383.
表2
土壤重分类名称及面积占比"
亚类名称 | 土类名称 | 土壤亚类代码 | 重分类名称 | 面积占比/% |
---|---|---|---|---|
寒冻土 | 寒冻土 | 23120171 | HDTXJ | 41.2 |
棕钙土 | 棕钙土 | 23113101 | ZGTXJ | 9.2 |
淡棕钙土 | 棕钙土 | 23113102 | DGTXJ | 5.4 |
棕漠土 | 棕漠土 | 23114121 | ZMTXJ | 3.3 |
含盐石质土 | 石质土 | 23115185 | HYSZTXJ | 1.4 |
草毡土 | 草毡土 | 23120102 | CZTXJ | 0.9 |
寒钙土 | 寒钙土 | 23120122 | HGTXJ | 2.0 |
冷钙土 | 冷钙土 | 23120132 | LGTXJ | 18.7 |
寒漠土 | 寒漠土 | 23120151 | HMTXJ | 5. 3 |
冰川雪被 | 冰川雪被 | 23127101 | ICE | 12. 6 |
表4
率定参数及其最优值"
参数模块 | 参数名称 | 参数意义 | 参数范围 | 参数最优值 |
---|---|---|---|---|
径流 | ESCO | 土壤蒸发补偿系数 | [0.01, 1.0] | 0.6 |
ALPHA_BF | 基流系数 | [0.1, 1.0] | 0.036 | |
CH_K2 | 主河道河床有效水力传导度 | [0, 50] | 6.5 | |
GWQMIN | “基流”水位阈值 | [1, 200] | 100 | |
GW_DELAY | 地下水延迟时间 | [0, 180] | 60 | |
冰川 | FM | 融冰系数 | [2.6, 13] | 5.5 |
Rice | 冰辐射系数 | [0, 0.1] | 14.4×10-6 | |
β0 | 基础蓄积系数 | [0.001, 0.006] | 0.003 | |
积雪 | SMFMX | 6月21日融雪度日因子 | [0, 10] | 6.5 |
SMFMN | 12月21日融雪度日因子 | [0, 10] | 1.0 | |
SFTMP | 降雪阈值温度 | [-5, +5] | 1.0 | |
SMTMP | 融雪阈值温度 | [-5, +5] | 0.5 | |
TIMP | 积雪温度滞后系数 | [0.1, 2.0] | 1.0 |
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