Reservoir Desilting Device Having Funnel with Bivariate Normal Surface

Abstract

The present disclosure provides a reservoir desilting device having a funnel with a bivariate normal surface, which belongs to the technical field of water conservancy projects. The device includes a sediment inlet funnel and a sediment transport pipeline, where the sediment inlet funnel is located in a sediment accumulation area in a reservoir, the sediment transport pipeline is laid on a river bed of the reservoir, a bottom of the sediment inlet funnel is connected to one end of the sediment transport pipeline, and the other end of the sediment transport pipeline penetrates out of a bottom of a dam; and the sediment transport funnel has a shape of a bivariate normal surface, the sediment transport pipeline has a shape of an inverse hyperbolic geodesic curve, and the sediment transport pipeline is provided with a valve.

Claims

1. A reservoir desilting device having a funnel with a bivariate normal surface, comprising a sediment inlet funnel and a sediment transport pipeline, wherein the sediment inlet funnel is located in a sediment accumulation area in a reservoir, the sediment transport pipeline is laid on a river bed of the reservoir, the bottom of the sediment inlet funnel is connected to one end of the sediment transport pipeline, and the other end of the sediment transport pipeline penetrates a bottom of a dam; and the sediment inlet funnel has the shape of a bivariate normal surface, the sediment transport pipeline has the shape of an inverse hyperbolic geodesic curve, and the sediment transport pipeline is provided with a valve.

2. The reservoir desilting device having a funnel with a bivariate normal surface according to claim 1, wherein the sediment inlet funnel has a forward direction of a z axis upwards along a water depth upwards, a forward direction of an x axis in a water flow direction, and a forward direction of a y axis departing from a shore, and the sediment inlet funnel has the shape satisfying: $\text{?}$ $\text{?}\text{indicates text missing or illegible when filed}$ wherein ?.sub.x is a standard deviation in an x direction, ?.sub.y is a standard deviation in a y direction, and k is a correction factor.

3. The reservoir desilting device having a funnel with a bivariate normal surface according to claim 1, wherein the sediment transport pipeline has a forward direction of a y axis upwards along a water depth, and a forward direction of a x axis in a water flow direction, and the sediment transport pipeline has the shape satisfying: $y=f\left(x\right)=-{\tanh }^{-1}x=-\frac{1}{2}\ln \frac{1+x}{1-x}.$

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0010] FIG. 1 is an entire longitudinal sectional view of a reservoir desilting device having a bivariate normal distribution funnel with a surface according to the present disclosure; and

[0011] FIG. 2 is a bivariate normal surface diagram.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0012] The present disclosure will be further described below with reference to the accompanying drawings.

[0013] FIG. 1 is a sectional view of a reservoir desilting device having a funnel with a bivariate normal surface according to the present disclosure. The reservoir desilting device includes a sediment inlet funnel and a sediment transport pipeline, where the sediment inlet funnel is located in a sediment accumulation area in a reservoir, the sediment transport pipeline is laid on a river bed of the reservoir, a bottom of the sediment inlet funnel is connected to one end of the sediment transport pipeline, and the other end of the sediment transport pipeline penetrates out of a bottom of a dam. The sediment transport pipeline has a shape of an inverse hyperbolic geodesic curve. The sediment transport pipeline has a forward direction of a y axis in a water depth upwards, and a forward direction of an x axis in a water flow direction. The sediment transport pipeline has the shape satisfying:

[00003]$y=f\left(x\right)=-{\tanh }^{-1}x=-\frac{1}{2}\ln \frac{1+x}{1-x}$

[0014] The sediment transport pipeline has the shape of the inverse hyperbolic geodesic curve and has a surface smooth everywhere. An inlet and an outlet are consistent with a direction of gravity, and a middle is inclined horizontally, such that a water flow carrying sediment may pass through a dam and be discharged smoothly, which improves the efficiency of desilting.

[0015] The sediment inlet funnel has a shape of a bivariate normal surface. As shown in FIG. 2, the shape satisfies a bivariate normal surface equation established by taking a water depth upward as a forward direction of a z-axis, a water flow direction as a forward direction of an x axis, and a direction away from a shore as a forward direction of a y axis.

[00004]$\text{?}$$\text{?}\text{indicates text missing or illegible when filed}$

[0016] ?.sub.x is a standard deviation in an x direction, ?.sub.y is a standard deviation in a y direction, and k is a correction factor. Since a surface of the bivariate normal surface is smooth everywhere, the sediment inlet funnel with the shape is not prone to accumulation during desilting, which may effectively prevent the sediment inlet from clogging.

[0017] When the reservoir desilting device having a funnel with a bivariate normal surface according to the present disclosure is in operation, the valve on the sediment transport pipeline is opened. Under the action of water pressure in the reservoir, a water flow carries sediment to be discharged into the reservoir downstream through and the sediment inlet funnel and a desilting pipeline.