CN110889236A - Method for calculating bursting and flooding time of barrier lake - Google Patents
Method for calculating bursting and flooding time of barrier lake Download PDFInfo
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- CN110889236A CN110889236A CN201911232065.8A CN201911232065A CN110889236A CN 110889236 A CN110889236 A CN 110889236A CN 201911232065 A CN201911232065 A CN 201911232065A CN 110889236 A CN110889236 A CN 110889236A
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- 230000009172 bursting Effects 0.000 title claims abstract description 7
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Abstract
The invention discloses a method for calculating the bursting time of a dammed lake, which comprises three steps, wherein the first step is to measure the maximum break height of a dammed body and the real-time water storage amount corresponding to the current water level, the second step is to calculate the water amount required by the current water level to rise to the dam top, namely the water amount of a overflowing dam, and the third step is to calculate the overflowing time according to the current time and the water amount of the overflowing dam on a warehousing flow process line.
Description
Technical Field
The invention relates to the technical field of hydrological prediction, in particular to a method for calculating the bursting and flooding time of a barrier lake.
Background
The dammed lake is formed by accumulating river channels on landslide, the formed damming body blocks the normal flow of river water, so that a lake is formed, the damming body is not as firm as a dam and has the possibility of collapse at any time, and once the damming body collapses, accumulated water rushes off, and unforeseen life and property losses are caused to downstream areas.
It follows that it is necessary to analyze and budget a dammed lake.
By applying the method, the collapse occurs at any point in the river channel to generate the barrier lake, and the collapse and diffusion time point corresponding to the barrier lake can be calculated according to the upstream incoming water flow process line, so that the disaster avoidance and escape time can be evaluated.
Disclosure of Invention
The invention aims to provide a method for calculating the bursting and overflowing time of a barrier lake.
In order to achieve the purpose, the invention provides the following technical scheme:
1. a method for calculating the flooding time of a dammed lake comprises the three steps of measuring the highest break height of a dammed lake and the real-time water storage amount corresponding to the current water level in the first step, calculating the water amount required by the current water level to rise to the top of a dam, namely the flooding dam water amount in the second step, and calculating the flooding dam time according to the current time and the flooding dam water amount on a warehousing flow process line in the third step as shown in figure 2.
2. The first step is that the highest elevation of the breach, as shown in fig. 4, is that when the water level rises to the elevation, the area of the submerged area is large, the flood will pour from the flood beach of the breach, the real-time water storage capacity corresponding to the current water level is small, as shown in fig. 3, at the time point corresponding to the water level, the river channel has collapsed, and the flood cannot be smooth any more, and in the simulation calculation, the time point can be randomly simulated and designated.
3. And secondly, calculating the dam overflow water volume, wherein the water volume is obtained by subtracting the reservoir water storage volume corresponding to the current water level from the reservoir flood volume corresponding to the flood level, and calculating the reservoir flood volume corresponding to the water level, wherein a water level reservoir volume relation v = f (z) is required, wherein v is the reservoir volume which is the reservoir flood volume, z is the water level in the formula, and the function f can be a binomial formula or a curve corresponding to a two-dimensional data table, as shown in fig. 1.
In practical use, when the reservoir capacity relationship v = f (z) is a binomial, the binomial has the form v = az + bz + c, and a, b and c are constants, v is the reservoir capacity and z is the water level.
4. And calculating the dam break time, as shown in fig. 5, the calculating process needs to have a warehousing flow process line, the warehousing flow process line is a group of flow process data with continuous and ordered time, the elements in the data have time and flow, the unit of the flow is m-th year/s and the water quantity flowing in the unit time, the time length between every two adjacent data in the flow process line is the time difference value of the two adjacent data, and the time length is multiplied by the flow of the corresponding time period, the dam break time is calculated, namely the water passing amount in the time period is obtained, the flow in the corresponding time period is the average value of the flows in the two adjacent data, the water passing amount in each adjacent time period is sequentially pushed backwards from the current time in the flow process line until the accumulated water passing amount is larger than the flooding amount, and the last time point is the flooding time.
5. And accumulating the water passing amount from the current time, wherein if the accumulated value does not exceed the flooding amount all the time, the water amount in the used time period does not cause the damming lake to flood the dam, the water amount does not exceed the dam top of the damming body, and the damming lake is safe in the time period corresponding to the flow process line.
6. The accumulated water flow is the integral of the flow process line in time, and the area of a part enclosed by the flow data and the horizontal axis of the coordinate is on the corresponding coordinate system.
7. The collapse time may be a point on the flow process line or an interpolation point on the flow process line, and the interpolation point is inserted to keep the data on the flow process line inconvenient to sort in time on one hand, and on the other hand, to keep the original flow process line inconvenient to shape, that is, the flow value of the insertion point and two adjacent flow values are on the same straight line.
8. By using the interpolation points, the calculation of the flooding time can be more accurate, and a time point when the accumulated excess water is close to the flooding water can be calculated.
In actual work, consideration and calculation of dam break time of the dam body are based on the premise that the dam body is firm enough, and the dam body can break in advance actually, namely the dam does not break due to water pressure even though the dam body does not overflow.
In actual work, a plurality of uncertainties influence dam break and flood break time, but the harmfulness of the barrage lake is too large, and the flood break time calculated according to the method has great reference significance in actual flood fighting and flood control decisions.
The invention has the advantages that:
by applying the method, the collapse occurs at any point in the river channel to generate the barrier lake, and the collapse and diffusion time point corresponding to the barrier lake can be calculated according to the upstream incoming water flow process line, so that the disaster avoidance and escape time can be evaluated.
Drawings
FIG. 1, water level reservoir capacity relationship.
Fig. 2, reservoir capacity analysis.
Fig. 3, the flooding zone corresponding to the current water level.
Fig. 4, flooding area corresponding to flooding level.
Fig. 5, calculating the flooding time according to the flooding water amount.
Fig. 6, calculating the flooding time on the flow process line.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a method for calculating the bursting and overflowing time of a barrier lake.
In order to achieve the purpose, the invention provides the following technical scheme:
1. a method for calculating the flooding time of a dammed lake comprises the three steps of measuring the highest break height of a dammed lake and the real-time water storage amount corresponding to the current water level in the first step, calculating the water amount required by the current water level to rise to the top of a dam, namely the flooding dam water amount in the second step, and calculating the flooding dam time according to the current time and the flooding dam water amount on a warehousing flow process line in the third step as shown in figure 2.
2. The first step is that the highest elevation of the breach, as shown in fig. 4, is that when the water level rises to the elevation, the area of the submerged area is large, the flood will pour from the flood beach of the breach, the real-time water storage capacity corresponding to the current water level is small, as shown in fig. 3, at the time point corresponding to the water level, the river channel has collapsed, and the flood cannot be smooth any more, and in the simulation calculation, the time point can be randomly simulated and designated.
3. And secondly, calculating the dam overflow water volume, wherein the water volume is obtained by subtracting the reservoir water storage volume corresponding to the current water level from the reservoir flood volume corresponding to the flood level, and calculating the reservoir flood volume corresponding to the water level, wherein a water level reservoir volume relation v = f (z) is required, wherein v is the reservoir volume which is the reservoir flood volume, z is the water level in the formula, and the function f can be a binomial formula or a curve corresponding to a two-dimensional data table, as shown in fig. 1.
In practical use, when the reservoir capacity relationship v = f (z) is a binomial, the binomial has the form v = az + bz + c, and a, b and c are constants, v is the reservoir capacity and z is the water level.
4. And calculating the dam break time, as shown in fig. 5, the calculating process needs to have a warehousing flow process line, the warehousing flow process line is a group of flow process data with continuous and ordered time, the elements in the data have time and flow, the unit of the flow is m-th year/s and the water quantity flowing in the unit time, the time length between every two adjacent data in the flow process line is the time difference value of the two adjacent data, and the time length is multiplied by the flow of the corresponding time period, the dam break time is calculated, namely the water passing amount in the time period is obtained, the flow in the corresponding time period is the average value of the flows in the two adjacent data, the water passing amount in each adjacent time period is sequentially pushed backwards from the current time in the flow process line until the accumulated water passing amount is larger than the flooding amount, and the last time point is the flooding time.
In fig. 5, the right-hand coordinate system shows time on the horizontal axis and flow rate on the vertical axis, with the flow rate being in m-th year.
5. And accumulating the water passing amount from the current time, wherein if the accumulated value does not exceed the flooding amount all the time, the water amount in the used time period does not cause the damming lake to flood the dam, the water amount does not exceed the dam top of the damming body, and the damming lake is safe in the time period corresponding to the flow process line.
In specific implementation, if no heavy rainfall exists in the near term, the warehousing flow process line is in a descending state, even if a dammed lake is formed, life and property threats to downstream cannot be caused, and the dammed body can be slowly solved within a relatively loose time.
6. The accumulated water flow is the integral of the flow process line in time, and the area of a part enclosed by the flow data and the horizontal axis of the coordinate is on the corresponding coordinate system.
7. The collapse time may be a point on the flow process line or an interpolation point on the flow process line, and the interpolation point is inserted to keep the data on the flow process line inconvenient to sort in time on one hand, and on the other hand, to keep the original flow process line inconvenient to shape, that is, the flow value of the insertion point and two adjacent flow values are on the same straight line.
In specific implementation, at the time point when the accumulated water passing amount is larger than the flooding water amount, if the difference of the preamble data of the time point is within 10 minutes, an interpolation point does not need to be calculated.
8. Using interpolation points, as shown in fig. 6, allows the calculation of the flooding time to be more accurate, and a point in time at which the cumulative excess water approaches the flooding amount can be calculated.
In specific implementation, calculation of the collapsing time is not required to be accurate, the calculation can be carried out within 10 minutes, and the tope and the collapsing water amount are calculated by 1000m in the vertical direction.
In actual work, consideration and calculation of dam break time of the dam body are based on the premise that the dam body is firm enough, and the dam body can break in advance actually, namely the dam does not break due to water pressure even though the dam body does not overflow.
In actual work, a plurality of uncertainties influence dam break and flood break time, but the harmfulness of the barrage lake is too large, and the flood break time calculated according to the method has great reference significance in actual flood fighting and flood control decisions.
The invention has the advantages that:
by applying the method, the collapse occurs at any point in the river channel to generate the barrier lake, and the collapse and diffusion time point corresponding to the barrier lake can be calculated according to the upstream incoming water flow process line, so that the disaster avoidance and escape time can be evaluated.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A method for calculating the flooding time of a dammed lake comprises the three steps of measuring the highest break height of a dammed lake and the real-time water storage amount corresponding to the current water level, calculating the water amount required by the current water level to rise to the top of a dam, namely the flooding dam water amount, and calculating the flooding dam time according to the current time and the flooding dam water amount on a warehousing flow process line.
2. A method according to claim 1, wherein the maximum breach elevation in the first step is a real-time water storage capacity when the water level rises to the elevation, the flood is poured from the breach onto the beach, the current water level corresponds to a time point when the river has collapsed and the flood is no longer smooth, and the time point can be randomly specified in the simulation calculation.
3. A method for calculating collapsing time of a dammed lake according to claim 1, wherein in the second step, the dam-collapsing water amount is calculated by subtracting the reservoir water storage amount corresponding to the current water level from the reservoir flood capacity corresponding to the collapsing water level, and the reservoir flood capacity corresponding to the water level is calculated by using a reservoir capacity relationship v = f (z), where v is the reservoir capacity, which is the reservoir flood capacity, and z is the water level, and the function f may be a binomial equation or a curve corresponding to a two-dimensional data table.
4. A method for calculating the collapsing time of a dammed lake according to claim 1, wherein the third step is to calculate the collapsing time, the calculating process requires a warehousing traffic flow process line, the warehousing traffic flow process line is a set of time-continuous and orderly traffic flow process data, the data includes element time and traffic flow, the unit of the traffic flow is m year/s, which is the amount of water flowing in a unit time, the time duration between each two adjacent data in the traffic flow process line is the time difference between the two adjacent data, the time duration is multiplied by the traffic flow in the corresponding time period, which is the water passing amount in the corresponding time period, the traffic flow in the corresponding time period is the average value of the traffic flow in the two adjacent data, the collapsing time is calculated, which is to sequentially push backward the accumulated water passing amount in each adjacent time period from the current time in the traffic flow process line until the accumulated water passing amount is greater than the collapsing amount, the last time point is the bursting time.
5. A method of calculating the collapsing time of a dammed lake according to claim 4, wherein the accumulated water amount from the current time is accumulated, and if the accumulated value does not exceed the collapsing water amount all the time, the water amount in the used time period does not cause the damming lake to be collapsed, and the water amount does not exceed the top of the damming body, and the damming lake is safe in the time period corresponding to the flow process line.
6. A method of calculating the collapse time of a dammed lake according to claim 4, wherein the accumulated water throughput is the integral of the flow process line in time, and the area of the portion enclosed by the flow data and the horizontal axis of the coordinates is on the corresponding coordinate system.
7. A method for calculating the collapsing time of a barrier lake according to claim 4, wherein the collapsing time can be a point on the flow process line or an interpolation point on the flow process line, and the interpolation point is inserted to keep the data on the flow process line of the water flow inconvenient in time sequencing on the one hand, and keep the original flow process line inconvenient in shape on the second hand, namely, the flow value of the insertion point and the adjacent two flow values are on a straight line.
8. A method of calculating a flood time for a dammed lake according to claim 7, wherein the calculation of the flood time is made more accurate by using interpolation points, and wherein a point in time at which the cumulative excess water approaches the flood water is calculated.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103164628A (en) * | 2013-03-29 | 2013-06-19 | 中国长江三峡集团公司 | Method of forecasting incoming flow of reservoir |
| KR20160064277A (en) * | 2014-11-27 | 2016-06-08 | (주)지아이 | Method for compiling a flood hazard map using a hydrograph and developing a hydrograph tryggered by dam-break from flood |
| CN109657281A (en) * | 2018-11-26 | 2019-04-19 | 西安理工大学 | A kind of drainage trough excavates the damming dam breaking mechanism analysis method of measure |
| CN110219277A (en) * | 2018-03-26 | 2019-09-10 | 中国水利水电科学研究院 | The dam bursting flood analysis system of dam system |
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- 2019-12-05 CN CN201911232065.8A patent/CN110889236A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103164628A (en) * | 2013-03-29 | 2013-06-19 | 中国长江三峡集团公司 | Method of forecasting incoming flow of reservoir |
| KR20160064277A (en) * | 2014-11-27 | 2016-06-08 | (주)지아이 | Method for compiling a flood hazard map using a hydrograph and developing a hydrograph tryggered by dam-break from flood |
| CN110219277A (en) * | 2018-03-26 | 2019-09-10 | 中国水利水电科学研究院 | The dam bursting flood analysis system of dam system |
| CN109657281A (en) * | 2018-11-26 | 2019-04-19 | 西安理工大学 | A kind of drainage trough excavates the damming dam breaking mechanism analysis method of measure |
Non-Patent Citations (2)
| Title |
|---|
| 刘火箭;王晓刚;李云;宣国祥;: "超标准洪水条件下土石坝防洪及抢护技术综述", 人民黄河, vol. 34, no. 07, pages 10 - 16 * |
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