CN-121986705-A - Micro-topography landscape irrigation system based on soil moisture content monitoring

CN121986705ACN 121986705 ACN121986705 ACN 121986705ACN-121986705-A

Abstract

The application relates to the technical field of micro-terrain landscape irrigation, in particular to a micro-terrain landscape irrigation system based on soil moisture content monitoring, which comprises a landscape water tank, an irrigation execution unit, a liquid level monitoring unit and a controller, wherein the controller is configured to execute double-pulse active excitation detection logic to drive the irrigation execution unit to output a first pulse water body, and after a standing window period is passed, the controller outputs a second pulse water body, and based on liquid level fluctuation of the landscape water tank, the controller respectively extracts a first backflow characteristic value corresponding to the first pulse water body and a second backflow characteristic value corresponding to the second pulse water body, and judges the soil state and triggers a corresponding mode based on a preset threshold value. The application can decompose isomorphism of coupled surface runoff through double pulse time sequence difference, thereby accurately identifying real infiltration requirements of micro-topography soil in a non-contact manner.

Inventors

SONG YANFENG
WANG XIN
GAO YUAN
GUO SHAOSHUAI
LIU BAOGUO
ZHANG XIAOPAN
ZHANG YONG
SONG HUALONG
SONG JIANING
NIU YANJUN
Fei Youxin
MA ZILING

Assignees

河南省景观规划设计研究院有限公司

Dates

Publication Date: 20260508
Application Date: 20260312

Claims (10)

1. The micro-terrain landscape irrigation system based on soil moisture content monitoring is characterized by comprising a landscape pond, an irrigation execution unit, a liquid level monitoring unit and a controller: The controller is configured to execute double-pulse active excitation detection logic to drive the irrigation execution unit to output a first pulse water body, and after a standing window period for attenuating soil surface tension is experienced, to output a second pulse water body equivalent to the first pulse water body; The controller respectively extracts a first backflow characteristic value corresponding to the first pulse water body and a second backflow characteristic value corresponding to the second pulse water body based on the liquid level fluctuation of the landscape water pool, which is monitored by the liquid level monitoring unit, and judges the soil state based on a preset threshold value: When the first reflux characteristic value is larger than a preset high reflux threshold value and the second reflux characteristic value is smaller than a preset low reflux threshold value, judging that the water repellency is in a pseudo-saturated state caused by soil surface tension, and triggering an intermittent membrane-breaking irrigation mode; and when the first reflux characteristic value and the second reflux characteristic value are both larger than the preset high reflux threshold value, judging that the irrigation system is in a positive-displacement true saturation state, and triggering an irrigation locking mode.
2. The system of claim 1, wherein the controller is configured to perform a dynamic zero calibration procedure in a preliminary rest period prior to starting the double pulse active excitation detection logic, and to measure a natural extinction rate of the liquid level per unit time to construct a dynamic background baseline that rejects environmental disturbances; The controller is further configured to perform a net reflux delta operation using the dynamic background baseline, logically superimpose measured liquid level rise values of the first and second pulsed water bodies within an observation period with theoretical liquid level compensation values generated based on the dynamic background baseline, respectively, and assign the net reflux delta thus obtained as the first and second reflux characteristic values, respectively.
3. The system of claim 2, wherein the controller is configured to run timing alignment and reference lock logic to: Setting the duration of the standing window period to be larger than a soil water-repellent film rupture time threshold so as to cover the evolution period of the physical tension of the soil surface layer; And simultaneously controlling the output power and the operation time length parameters of the first pulse water body and the second pulse water body to be consistent, and providing a unified physical differential reference for the net backflow incremental operation.
4. The system of claim 3, wherein the controller is configured to execute a physical hardening identification program: when the first reflux characteristic value and the second reflux characteristic value are monitored to fall into a permeation impedance interval between the high reflux threshold value and the low reflux threshold value and the differential attenuation rate of the first reflux characteristic value and the second reflux characteristic value is lower than a preset tension response threshold value, judging that a compact physical crust is formed on the soil surface layer, and defining the system as a physical hardening state; and the controller responds to the state to trigger a low-intensity diffuse immersion mode, calls micro-pressure permeation parameters lower than rated frequency to drive the irrigation execution unit, and executes softening permeation with long time sequence on the compact physical crust.
5. The system of claim 2, wherein the controller is configured to execute deep water deficit response logic to: When the first reflux characteristic value and the second reflux characteristic value are both lower than the low reflux threshold value, judging that the high-permeability water-requiring state is achieved, triggering a full-speed linkage replenishment mode, and synchronously starting the irrigation execution unit and an external replenishment valve; And simultaneously running a feedforward water balance control program, monitoring the evolution slope of the first reflux characteristic value and the second reflux characteristic value in a continuous period, and closing the external water supplementing valve in advance before the liquid level of the landscape pool reaches a physical overflow point when the evolution slope shows an exponentially rising trend.
6. The system of claim 1, wherein the controller is configured to perform the intermittent rupture-membrane irrigation mode: running a discretization water injection program, driving the irrigation execution unit to circularly switch between micro-pulse water injection and tension dissipation standing states, and limiting water injection power to be lower than a preset surface runoff generation threshold value; The controller maintains the circulation until the first backflow characteristic value and the second backflow characteristic value are monitored to be attenuated to a preset effective infiltration interval, and the soil water receiving capacity is judged to be recovered.
7. The system of claim 6, wherein the controller is configured to run dynamic duty cycle constraint logic to: Limiting the single time duration of the micro-pulse water injection to be lower than a preset surface runoff collection time threshold value, so that the water injection quantity is adapted to the roughness retention capacity of the micro-topography surface; And simultaneously, setting the time length of the tension dissipation and standing to be larger than a preset vertical gravity infiltration threshold value, and destroying a water-repellent film structure on the soil surface layer by utilizing the dry-wet alternate action generated in a circulating way.
8. The system of claim 1, further comprising an active overflow unit in communication with the landscape pool; the controller is configured to execute hysteresis loop defense logic after triggering the irrigation lockout mode: monitoring the liquid level rising rate of the landscape pool in real time to identify a continuous increase in liquid level caused by a soil lag in-soil flow; when the liquid level is monitored to approach a preset safety warning threshold value, driving the active overflow unit to execute defensive capacity leakage, and dynamically adjusting the leakage power to offset the afflux flow of the soil lag soil middle flow.
9. The system of claim 2, wherein the controller is configured to run a signal fidelity preprocessing routine prior to extracting the first reflow characteristic value and the second reflow characteristic value: setting the sampling frequency of the liquid level monitoring unit to be higher than a preset water surface fluctuation frequency threshold value, and simultaneously performing frequency spectrum denoising on the collected original liquid level data.
10. The system of claim 9, wherein the controller is configured to perform a logical validity check procedure using the data processed by the signal fidelity preprocessing procedure: a physical backflow limit threshold is preset based on the total output amount of the first pulse water body and the second pulse water body and the sectional area of the landscape pool; And if the calculated net backflow increment exceeds the physical backflow limit threshold, judging that an external water source intrusion exists, triggering detection interruption and reset logic, and stopping the double-pulse active excitation detection logic.

Description

Micro-topography landscape irrigation system based on soil moisture content monitoring Technical Field The application relates to the technical field of micro-terrain landscape irrigation, in particular to a micro-terrain landscape irrigation system based on soil moisture content monitoring. Background In the field of modern landscape design, micro-topography landscapes are widely used due to the abundant vertical levels and various ecological microenvironments. Such landscapes typically employ a closed or semi-closed circulating water system layout of a "slope planting area-central catchment landscape pool", i.e., a central landscape pool that utilizes the natural terrain elevation differences to collect irrigation residual water and rainfall surface runoffs to the lowest terrain. The pool is used as a landscape water body for displaying and is also used as a core reserve water source for cyclic irrigation. In order to maintain the water balance and vegetation health of such closed ecosystems, it is generally necessary to rely on an intelligent control system to dynamically monitor soil moisture content of the micro-terrain areas and to precisely adjust irrigation intensity accordingly. The core aim of the method is to ensure that the plant root system obtains sufficient moisture, avoid water resource waste or water pool overflow and submerge peripheral facilities caused by excessive irrigation, and prevent vegetation from withering due to lack of water in drought period, thereby realizing high internal circulation and high-efficiency utilization of water resources. At present, in order to realize accurate irrigation control on similar ecological areas, the related fields have been subjected to intensive research and technical deployment. For example, chinese patent publication No. CN121366055A discloses an ecological bank protection intelligent irrigation control system and method based on multi-source data fusion. According to the technical scheme, soil moisture sensor networks are distributed at different heights Cheng Wangge of the green-bank protection, soil volume moisture contents of different depths of the underground are collected in real time, meteorological parameters and vegetation growth data are combined, and a multisource data fusion and prediction model is utilized to dynamically adjust irrigation threshold and strategy. Meanwhile, the system also monitors the blocking state of the underwater fish nest channel by utilizing the sonar, and timely cleans and synchronously adjusts irrigation water delivery parameters when physical blocking is detected so as to ensure smooth running and ecological stability of the whole water network system. The prior art focuses on the technical problem that vegetation water-demand space-time distribution is matched with system water supply capacity through mathematical fusion of a highly distributed physical sensing network and multi-source heterogeneous data, and has higher control precision under the condition of perfect sensor deployment. However, the above prior art is faced with special application scenario limitations when directly applied to the intensive irrigation cycle control of closed micro-terrain landscapes. In actual garden maintenance, due to factors such as construction cost, beautiful landscape degree, damage of sensor lines caused by plant root systems or maintenance machinery, and the like, the soil sensor network is difficult to densely lay on the whole micro-terrain slope, the system often needs to be withdrawn for the second time, and the liquid level rising rate (namely the surface produced flow collection amount) of the monitoring center water collection landscape pool is relied on as a macro regulation index for inverting the soil saturation. Under the specific scene, the prior art exposes a core technical defect which is difficult to overcome, namely that control logic cannot effectively identify isomorphic contradiction between the surface flow signal and the real soil permeability requirement. In particular, the physical properties and hydrologic state of the micro-topography surface soil are highly deceptive in the physical appearance of "surface runoff". When subjected to drought for a period of time, the micro-topography sloping soil surface is extremely prone to develop strong water repellency effects or to form dense physical hardened crust. At this time, if the system is started to irrigate, water cannot infiltrate into soil against surface tension in a short time, but rapidly forms surface runoff on the surface layer and rapidly flows back to the central landscape pool, so that the pool liquid level is remarkably increased in a short time. The single-line feedback control logic in the prior art can directly and linearly correlate the high backflow signal which is characterized by the rapid liquid level rise into the state that the soil is fully wetted or saturated, so that an error decision for stopping irrigation is made, t