Rainfall segmentation method used for ditch bed starting type debris flow prediction
A ditch bed startup and debris flow technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of large amount of calculation, no effect of stimulating rainfall, neglect, etc., and achieve the effect of a wide range of applications
Inactive Publication Date: 2016-07-06
CHENGDU UNIVERSITY OF TECHNOLOGY
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The main problems of this method are: (1) there is no scientific method for the coefficient of decay with time, it is determined artificially; (2) there is no scientific basis for the length of time to determine the appropriate time, if the time is very long (such as 30 days), not only the amount of calculation is large, but also the rainfall for a long time has no effect on the subsequent rainfall; if the time is very short (such as 3 days), the effect of the heavy rainfall 3 days ago may be ignored
This method comes from the fact that there are a large number of collapses and landslides in the strong earthquake area, and it is only within a period of time within 3 years after the earthquake. This method is not applicable to areas less affected by the earthquake and for a longer period of time after the earthquake
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[0021] The technical solutions of the present invention will be further described below in combination with preferred embodiments.
[0022] Table 1 is the hourly rainfall monitoring data of the Ganchang Rainfall Observatory in Nanjiang County from September 6 to 18, 2011. This area belongs to the area with good vegetation coverage, x is 1, so the critical value R 0 = 2 mm. The method of the invention is used to calculate the pre-rainfall value for triggering debris flow based on the real-time rainfall in Nanjiang County. In the table, R is the previous rainfall value (mm), and D is less than the critical value R 0 = time (h) for 2 mm. Since the actual data does not use the judgment that the cumulative rainfall of 12 consecutive hours is less than 12mm, the rainfall division has been judged by using the rainfall intensity of 6 consecutive hours to be less than 2mm / h, so the small cumulative rainfall value of 12 consecutive hours is not given in the table.
[0023] Table 1 P...
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The invention belongs to the field of the debris flow prevention and treatment project and the water conservancy project, and relates to a rainfall segmentation method used for ditch bed starting type debris flow prediction. The rainfall segmentation method comprises the following steps: according to the rainfall data of an area per hour, determining whether a rainfall value of one previous hour achieves or exceeds a rainfall critical value R0 or not; if the rainfall value of one previous hour is smaller than the rainfall critical value R0, stopping including into early rainfall; if the rainfall value of one previous hour is greater than or equal to the rainfall critical value R0, taking a hour rainfall capacity as an original early rainfall value R1, then, taking the following rainfall value of each hour as early rainfall values R2, R3,...Rn, and overlaying hour over hour to obtain an early rainfall capacity sum R of the nth hour, wherein the rainfall capacity of the time period is Rn+1; and according to the early rainfall capacity sum R and the rainfall capacity Rn+1 of the time period, calculating a rainfall composite value R*. The method is free from time control, calculates the influence of the early rainfall on a soil infiltration rate, more conforms to a practical situation and is free from territorial restrictions.
Description
technical field [0001] The invention belongs to the fields of mud-rock flow prevention and control engineering and water conservancy engineering, and relates to a rainfall segmentation method for predicting ditch bed-starting type mud-rock flow. Background technique [0002] A channel is a steeply sloping water collection channel that is washed by intermittent floods. After the slope runoff is generated, along the slope direction, with the continuous increase of rainfall runoff accumulation, a flash flood with large single-width discharge and flow velocity is formed. Channel erosion refers to the erosion form in which the slope runoff concentrates on the soil and parent rock and cuts into the ground to form a large gully. Loose solids are abundant in the trenches. When the loose solids are tilted or bottomed out due to climate, environment, and hydrological influences, debris flows will start. This type of debris flow is called channel erosion debris flow. The characterist...
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Login to View More IPC IPC(8): G06F19/00
CPCG16Z99/00
Inventor 余斌王治兵
Owner CHENGDU UNIVERSITY OF TECHNOLOGY