CN1160792A

CN1160792A - Convex bank deposit-increasing method

Info

Publication number: CN1160792A
Application number: CN 96118071
Authority: CN
Inventors: 郑长天; 郑江霞; 郑成
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-03-21
Filing date: 1996-03-21
Publication date: 1997-10-01

Abstract

Convex bank deposit-increasing method is that in the convex bank section comprising flood land, is constructed leakage sand deposit bank of height 30-50 cm, smaller slope on the water side and greater slope on the bank side. During flood, silt deposits to reduce sediment concentration in water, and while normal water level, sand is traped to increase land and thus protects the bank. As a new regulation method of river, the said method may be combined with bank revetment.

Description

Strengthen convex bank deposition method

The present invention relates to a kind of new water conservancy project method of hydraulic engineering regulation.

The mountains and rivers physical features is under the external force geologic process of the earth, and such as under the geologic process of ground flowing water, eminence is degraded, and deposition is accepted in the depression, and constantly cutting height fills out low process, and the face of land is gradually degradated.This ground state of degradation naturally if no certain crustal movement makes the face of land produce new fluctuating, is inevitable.People still can not contain this degradation process, only may be by certain method and measure, and alleviation or quicken this degradation process in certain local space-time model is raised.

Modern times be used to the to control flood method of sand control can be divided into two classes: the one, and afforestation project is administered; The 2nd, the regulation of water conservancy project method.It mainly is to build greenbelt that afforestation project is administered, and loses with current to reduce the top layer sandy soil Gu soil protects water, and this is effective and necessary.But afforestation project is only limited in the river valley, the improvement of lake and reservoir periphery, and this is not enough naturally.The regulation of existing water conservancy project method mainly is to build simple and easy river levee sediment trapping to increase the ground method, no dam diversion natural sand discharging flood discharge method and with certain flood diversion project replacement flood control by reservoir regulation method.These all are effectively, remove silt and defending flood function but still can not have nature simultaneously concurrently.

The present invention's purpose purport provides a kind of and makes full use of the sedimentation effect, the fill sediment trapping increases ground, reduces the river sand content, prevents that long-term ponding in the flood water-break postdam, cooperation greening from administering, further administering silt, control silt deposits and brings the new water conservancy project method-enhancing convex bank deposition method of the hydraulic engineering regulation of harm to large-scale dam.

Technical scheme of the present invention is: in the low flat location, the lowest point of river alongshore, mainly be to build seepage formula desilting dike being soaked curved convex bank location, the river of beach etc. forming by point bar, river, this dike has the seepage space, and dike is high 30～50 centimeters, slow by water one side levee slope, the side levee slope that pulls in to shore is steep.

The present invention is when flood, flood immerses the sedimentation of bringing into, during the flood water-break, silt is stayed the sediment charge that can reduce in the dike in the river, because the present invention be a kind of dike with seepage space, can not cause in the dike ponding for a long time after the water-break, enclose sand in the dike and can plant trees with increasing and afforest, the different gradient design of dike both sides helps river sand and passes back into the river with the silt that water immerses and prevention has deposited.Build this seepage formula desilting dike in many places, Binjiang convex bank location, river, help reducing sediment charge, further solve the deposit problem of the harm that brings to large-scale dam of river load.

Fig. 1 is the schematic cross section of the seepage formula desilting dike that soaks the convex bank formed on the beach at effluent and build.

As shown in Figure 1, in the river, littoral low flat location, the lowest point, downstream, mainly be by point bar, the river is soaked the curved convex bank location, river of composition such as beach and is built seepage formula desilting dike (1), promptly in the period when a river is at its normal level, some positions slightly on the upper side in this line of demarcation, land and water, class location, imitative natural levee is repaiied the aritificial horizon that exceeds 30 to 50 centimeters on level land together approximately, slow by water one side levee slope, slope angle should be got 30 ° approximately less than the angle of repose (34 °) of the grains of sand, is beneficial to river sand with depositing in the water immersion dike, steep by land one side levee slope, slope angle should be greater than 34 °, get 45 ° to 80 ° all can, pass back into the river when stoping the silt water-break that has deposited.And when fill, as building enclosure wall, but keep the space of certain seepage, in order to avoid long-term ponding in the water-break postdam.And when silt aggradation year by year, gradually with the dike height near the time, can increase the dike height more one by one.And in dike, carry out the economic forest construction simultaneously, not only protect soil but also can increase economic benefit.(1) is seepage formula desilting dike among Fig. 1, and (2) soak the beach deposit for the river, and (3) are the unidirectional circulation of river, and (4) are the river bed deposit thing.The present invention is in the enforcement of the Three Gorges Projects, can be in the section, the Changjiang river more than the Three Gorges Projects dam, above section, backwater zone particularly, and forks such as Jia Lingjiang River, Fujiang River, Tuo Jiang and Ming River, mainly be to build seepage formula desilting dike at convex bank, and, can take supporting shore protection, the bank protection etc. built of common method the bold shore of concave bank and complete steadiness difference.Can finish general regulation task like this.

Claims

1, a kind of enhancing convex bank deposition method, it is characterized in that in the low flat location, the lowest point of river alongshore, mainly be to build seepage formula desilting dike (1) soaking curved convex bank location, the river of beach etc. forming by point bar, river, this dike has the seepage space, dike is high 30～50 centimeters, slow by water one side levee slope, the side levee slope that pulls in to shore is steep.

2, enhancing convex bank deposition method according to claim 1 is characterized in that ending 34 ° at angle by the slope angle of water one side dike less than the body of the grains of sand, and the side levee slope angle of pulling in to shore is got 45 °～80 ° greater than 34 °.

3, enhancing convex bank deposition method according to claim 1 is characterized in that seepage formula desilting dike (1) build line of demarcation, the land and water period when a river is at its normal level in slightly on the upper side on the convex bank at some positions.