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A Calculation Method of Rain and Snow Mixed Runoff in Alpine Mountain Areas

A technology for watersheds and mountainous areas, applied in the field of mixed runoff calculation of rain and snow in alpine mountainous areas, can solve the problems of limited model calculation accuracy, lack of runoff model changes, lack of underlying surface data, etc., to achieve strong engineering significance and reduce dependence Effect

Active Publication Date: 2020-07-17
HOHAI UNIV
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Problems solved by technology

However, it is worth noting that these models lack consideration of changes in runoff patterns during soil freeze-thaw transitions, and the lack of underlying surface data in alpine mountainous areas further limits the accuracy of model calculations

Method used

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  • A Calculation Method of Rain and Snow Mixed Runoff in Alpine Mountain Areas
  • A Calculation Method of Rain and Snow Mixed Runoff in Alpine Mountain Areas
  • A Calculation Method of Rain and Snow Mixed Runoff in Alpine Mountain Areas

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Embodiment

[0104] According to the hourly precipitation, temperature and evaporation data of a small watershed in an alpine mountain area for one year, according to the method of the present invention, the calculation process of the watershed hourly flow during the research period is:

[0105] (1) Define the hourly precipitation series as P 1 ,P 2 ,...,P t ,..., the air temperature series is The evaporation energy series is Taking 0°C as the threshold, the rainfall and snowfall series are calculated as P r,1 ,P r,2 ,...,P r,t ,... and P s,1 ,P s,2 ,...,P s,t ,...;

[0106] (2) At the calculation time t, accumulate the snowfall amount P in this period s,t and the remaining water equivalent S of the snow pack in the basin at time t-1 t-1 ′, to obtain the water equivalent S of the snow field in the current period t =P s,t +S t-1 ';

[0107] (3) Based on the historical meteorological and hydrological data, the parameter calibration method is used to determine the snow area a...

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Abstract

The invention discloses a method for calculating rain and snow mixed runoff in a cold highland area drainage basin. The method comprises the steps that rainfall, air temperature and evaporation data in a to-be-calculated time interval are acquired; historical meteorological hydrologic data is utilized to construct three runoff space nonuniformity curves of a snow-cover area attenuation curve, evaporation area distribution curve and tension water storage capacity curve; a full storage-excess infiltration combination runoff computing mechanism determined according to a soil freezing state is established, thereby based on the rainfall, air temperature and evaporation data in the to-be-calculated time interval and the three runoff space nonuniformity curves, the rain and snow mixed runoff in the drainage basin in the to-be-calculated time interval is calculated and obtained by using the full storage-excess infiltration runoff computing mechanism. The method for calculating the rain and snow mixed runoff in the cold highland area drainage basin has the advantages that the problem of calculating the rain and snow mixed runoff in the cold highland area drainage basin can be solved, and the dependence degree of the runoff calculation on underlying surface data in a distributed hydrological model is reduced.

Description

technical field [0001] The invention relates to the technical field of watershed hydrological forecasting, in particular to a method for calculating runoff mixed with rain and snow in a watershed in alpine mountainous areas. Background technique [0002] The application of distributed hydrological models is an important tool for simulating and forecasting hydrological processes in watersheds. The hydrometeorology and underlying surface conditions in alpine regions have significant vertical variability. Seasonal / diurnal changes in temperature cause interweaving cycles of ice, snow and soil freeze-thaw processes, forming an extremely complex hydrological process. Therefore, when constructing a distributed hydrological model in alpine mountainous areas, it is necessary to establish a runoff calculation method that can characterize the soil freeze-thaw process and adapt to the data conditions in alpine mountainous areas. [0003] At present, there are many distributed hydrologi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F16/29
CPCG06F16/29
Inventor 李彬权梁忠民王军胡义明刘甜黄华平黄一昕
Owner HOHAI UNIV
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