Frozen soil parameterization in a distributed biosphere hydrological model

Frozen soil parameterization in a distributed biosphere hydrological model
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分布式生物圈水文模型中的冻土参数化

DOI:
10.5194/hess-14-557-2010
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发表时间:
2009-11
期刊:
Hydrology and Earth System Sciences Discussion
影响因子:
--
通讯作者:
Yang Kun
Yang Kun
中科院分区:
其他
文献类型:
--
作者:
Jin Rui;Li Hongyi;T.Koike;Wang Lei;Yang Kun

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抽象。在这项研究中,冻土参数化已被修改,并纳入分布式生物圈水文模型(WEB-DHM)。然后,在一个小的寒冷地区,Binngou流域,对水(流域联合遥测实验研究)的原位观测与冻结计划的WEB-DHM进行了严格的评估。首先,利用DY站7月份观测的地表辐射通量和上层(5、10和20 cm)土壤水分,利用WEB-DHM(不含冻结方案)优化了地表参数和两个货车vanchchten参数。第二,通过使用WEB-DHM与冻结方案,两个冻土参数进行了校准使用的土壤温度在5 cm深的DY站从2007年11月21日至2008年4月20日,而其他土壤水力参数进行了优化,在流域出口的流量校准在7月和8月,涵盖了2008年的年度最大洪峰。使用这些校准参数,然后将具有冻结方案的WEB-DHM用于2007年11月21日至2008年11月20日的为期一年的验证。结果表明,在全年模拟中,采用冻结方案的WEB-DHM在寒冷地区集水区土壤水分剖面和流域出口流量的模拟中比不采用冻结方案的WEB-DHM表现出更好的性能。
Abstract. In this study, a frozen soil parameterization has been modified and incorporated into a distributed biosphere hydrological model (WEB-DHM). The WEB-DHM with the frozen scheme was then rigorously evaluated in a small cold area, the Binngou watershed, against the in-situ observations from the WATER (Watershed Allied Telemetry Experimental Research). First, by using the original WEB-DHM without the frozen scheme, the land surface parameters and two van Genuchten parameters were optimized using the observed surface radiation fluxes and the soil moistures at upper layers (5, 10 and 20 cm depths) at the DY station in July. Second, by using the WEB-DHM with the frozen scheme, two frozen soil parameters were calibrated using the observed soil temperature at 5 cm depth at the DY station from 21 November 2007 to 20 April 2008; while the other soil hydraulic parameters were optimized by the calibration of the discharges at the basin outlet in July and August that covers the annual largest flood peak in 2008. With these calibrated parameters, the WEB-DHM with the frozen scheme was then used for a yearlong validation from 21 November 2007 to 20 November 2008. Results showed that the WEB-DHM with the frozen scheme has given much better performance than the WEB-DHM without the frozen scheme, in the simulations of soil moisture profile at the cold regions catchment and the discharges at the basin outlet in the yearlong simulation.
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