JPH046811B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a systemized environmental improvement method for dams and rivers.

In recent years, the speed of accumulated sludge in dams has become significantly faster than estimated at the time of design, and the shortening of the lifespan of dams has become a social problem. As a result, sludge is also flowing into downstream rivers, affecting inland fisheries. Until now, no fundamental measures have been taken to address these problems.

The present inventor completed the present invention as a result of various studies to solve these conventional problems.

That is, the present invention performs water stoppage or drainage construction on the slope surface soil upstream of the dam, deploys multiple float bodies with flaps at the dam entrance, and dredges the accumulated sludge inside the dam, while providing flaps in the downstream river. The present invention relates to a method for improving the environment of dams and rivers, which comprises deploying multiple float bodies, and providing a sludge accumulation groove on the river bed where the float bodies are deployed along the direction in which the float bodies are deployed.

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a schematic diagram illustrating the present invention. First, the topsoil of the slope, which is generated due to deforestation, etc., is covered with a water-stop sheet or the like, or drainage construction is carried out, as shown by A in the drawing. As a water-stopping method, a sheet-like water-stopping sheet made of fiber-filled nonwoven fabric or the like may be fixed so as to cover the topsoil of the slope. Also the second
As shown in the figure, a water-permeable layer 3 is provided on the outer periphery of a pipe 2 (perforated pipe) having holes 1 made of a water-permeable material, and a large number of dewatering members 5 are provided inside the perforated pipe 2 with stones 4 etc. A water-permeable layer may be provided on the slope part in series (see Fig. 4). The dewatering member is constructed of a perforated pipe with at least one end of the end portion 6 protruding from the water permeable layer 3 in order to facilitate the continuous installation. end 6
It is preferable to configure at least one end of the water-permeable layer 3 to be located inside the water-permeable layer 3. A drainage layer consisting of these continuous drainage layers should be provided on the slope as shown in Figure 4, and both ends of the continuous drainage layer should be exposed to the outside of the slope as shown in Figure 5. is preferred.

Further, a float body consisting of a float 8 provided with a flap 7 as shown in FIGS. 6 and 7 is installed in series at the dam entrance, and the float body is expanded multiple times B. The flap 7 used can be in the form of a sheet, a net, or the like. As a result, driftwood and the like flowing into the dam are captured here, and sludge material is settled.

Furthermore, the river downstream of the dam is shown in Figure 6 or 7.
Float bodies as shown in the figure are arranged in series and are expanded multiple times. As shown in FIG. 8, a sludge accumulation groove 9 is provided on the riverbed where this float body is extended. If sludge accumulates in the groove 9, it can be removed by dredging, thereby allowing sludge to accumulate over a long period of time.

The sludge accumulated in the dam is removed by, for example, pump dredging.D.

The float body used in the present invention not only purifies organic matter by settling the sludge particles and breeding various organisms in the flaps, but also serves as a feeding ground for fish.

By organically combining the above methods, the method of the present invention can avoid sludge accumulation in dams as much as possible, maintain good water quality in rivers downstream of dams, and improve habitat for fish.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing a system of the method of the present invention, FIG. 2 is a sectional view of a dewatering member, and FIG. 3 is a partial sectional view of the dewatering member showing another embodiment,
FIG. 4 is a sectional view showing a state in which a dewatering member is installed on a slope, FIG. 5 is a plan view of FIG. 4, and FIGS. 6 and 7 are front views of the float body.
FIG. 8 is a cross-sectional view of the expanded float body with sludge accumulation grooves provided on the river bottom.

Claims (1)

[Claims] 1 Water stoppage or drainage construction is carried out on the topsoil of the slope upstream of the dam, and multiple float bodies with flaps are deployed at the dam entrance to dredge the accumulated sludge inside the dam, while float bodies with flaps are installed in the downstream river. A dam and river system characterized in that a sludge accumulation groove is provided in the riverbed along the extension direction of the float body in the riverbed where the float body is expanded in multiple layers, and when sludge is deposited in the sludge accumulation groove, it is removed by dredging. Environmental improvement methods.