Modeling runoff from the inylchek glaciers and filling of ice‐dammed lake merzbacher, central tian shan

Modeling runoff from the inylchek glaciers and filling of ice‐dammed lake merzbacher, central tian shan
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模拟来自 inylchek 冰川的径流和中天山 Merzbacher 冰堰湖的充填

DOI:
10.1111/geoa.12061
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发表时间:
2014
期刊:
Geografiska Annaler: Series A, Physical Geography
影响因子:
--
通讯作者:
W. Hagg
W. Hagg
中科院分区:
--
文献类型:
--
作者:
Usubaliev;W. Hagg

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我们开发了一个空间分布的概念融化和径流模型,能够科普碎片覆盖的冰川部分。亚碎片熔化计算的基础上,从现场观测得出的经验公式。该模型应用于nylchek冰川。虽然来自奥里涅尔切克的径流直接流入涅尔切克艾弗,但奥里涅尔切克的径流被奥里涅尔切克阻挡,形成了湖泊。这个湖经常因突发洪水而干涸。为了校准模型,使用了多算法、遗传自适应多目标方法()。日径流观测nylchek艾弗以及冰川质量平衡梯度从其他冰川在ian han被用作目标函数在三个分裂的样本。径流模拟产生的灰utcliffe系数大多高于0.9,和质量平衡梯度模拟在可接受的范围内。不同分离样本的结果差异很大。考虑到所使用的目标函数和额外的数据,如平衡线高度,我们选择了最有前途的参数集来计算阿克埃尔兹巴赫填充。这一分析回答了有关湖泊水文系统的几个问题。除了在奥伦尼切克冰川形成的冰坝处的崩解外,这个湖似乎主要由奥伦尼切克冰川的融水填充。湖有一个永久的径流,也在填充过程中。爆发之后,通道似乎很快就关闭了。
We developed a spatially distributed conceptual melt and runoff model able to cope with debris covered glacier parts. Subdebris melt was calculated based on empirical equations derived from field observations. The model was applied at the nylchek glaciers. While runoff from outhern nylchek flows directly into nylchek iver, runoff from orthern nylchek is blocked by outhern nylchek and forms ake erzbacher. This lake is drained frequently by outburst floods. To calibrate the model, a multi‐algorithm, genetically adaptive multi‐objective method () was used. Daily runoff observations from nylchek iver as well as glacier mass balance gradients from other glaciers in the ian han were used as objective functions in three split samples. Runoff simulations yielded ash–utcliffe coefficients mostly higher than 0.9, and the mass balance gradients were simulated in an acceptable range. The results of the different split samples vary considerably. Considering the used objective functions and additional data such as the equilibrium line altitude, we chose the most promising parameter set to calculate the filling of ake erzbacher. This analysis indicated answers to several questions concerning the hydrological system of the lake. Apart from calving at the ice dam formed by outhern nylchek glacier, the lake seemed so be filled predominantly by meltwater from orthern nylchek glacier. The lake has a permanent runoff, also during the filling process. After the outburst, the channels seemed to be closed quickly.
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