基于CAN总线的水产养殖水质在线监控系统设计与实现

设计完成了一套水产养殖水质多参数在线监控系统,该系统采用CAN现场总线技术实现现场数据的传输,采用GSM无线通信技术进行远程数据采集和监控。本系统对温度、溶解氧、pH值、导电度等水质参数进行实时监测,并针对其中的溶解氧实现了自动控制。现场应用结果表明系统具有良好的实用性和稳定性,能较好的满足水产养殖水质监控的需求。

一种低功耗水产养殖水质监测系统设计方法

为解决现有水产养殖水质监测系统功耗高、节点能量有限的问题,设计了一款低功耗水产养殖水质监测系统。对于无线检测节点,主要采用周期自适应调节算法减少数据发送次数和发射功率自适应调节算法降低功耗;对于检测网关,主要采用NB-Io T技术降低无线传输功耗和搭载FreeRTOS实时操作系统提高CPU利用率的方式降低功耗。试验测得:在不丢失重要变化数据的条件下,采用周期自适应调节算法与采用固定周期15 min和30 min相比,数据发送次数分别减少了140%和20%;在满足系统要求丢包率的条件下,采用功率自适应调节算法的节点要比采用固定发射功率4 d Bm的节点功耗降低9.5%~42.5%。研究表明,本系统具有功耗低、稳定性高、远程控制灵敏的特点,具有较高的应用价值。

水产养殖环境因子数据动力学分析与智能预测

进行水质环境因素分析对水产养殖的效益极为重要。研究水体因素的三个主要参数:水温、p H值以及溶解氧。针对检测仪取样的数据存在缺失、不准确等问题,通过高阶曲线插值较好地修复了数据,同时运用滤波方法划分了系统误差以及参数的自身节律;对不同水层、时间的参数分析,较好地吻合了实际水文情况,为工程养殖提供了可靠的依据;通过引入径向基函数神经网络方法跟踪主要参数的特征,弥补了非线性多项式插值的不足,实际数据证明了该方法全局跟踪有效以及局部节律刻画程度精细。

水产养殖检测滑翔机的研制

针对水产养殖水质在线动态检测的问题,设计了长航程微型水产滑翔机,研究了细长椭球线型、Slocum线型、纺锤体线型的三种形体,进行了阻力与升力曲线优化分析,研制的水产养殖巡航实验表明,在1-5m的水深下巡航,具有更快的姿态调节速度、较好的定位及无线通信能力,对水质巡回检测具有重要应用价值。

饶平县黄冈镇大澳村叠石埭和红山埭水质对比分析

通过对饶平县黄冈镇大澳村叠石埭和红山埭两水产养殖区的水质检测数据的分析,结果表明两水域受到不同程度的污染,红山埭比叠石埭要严重,有的指标超过了Ⅲ类标准。

Application of Fuzzy Comprehensive Evaluation Method Based on Entropy Weight to Evaluate Pond Water Quality

[Objective] This study was to provide references for the evaluation of water quality in aquaculture ponds by evaluating the pond water quality using fuzzy comprehensive evaluation method based on entropy weight. [Method] The fuzzy compre- hensive evaluation method based on entropy weight was used to evaluate the water quality in the ponds with Ukraine scale carp （Cyprinus carpio） as the main cultivated fish. The average size of the fish was 71.4 g/ind, and totally three groups of pond were set with the population density of 6 000, 9 000, 12 000 ind/hm2. [Result] According to the GB3838-2002 Environmental Quality Standards for Surface Water of China, the water quality of 6 000 ind/hm2 group was Grade I, and the water quality of 9 000 and 12 000 ind/hm2 were Grade V. [Conclusion] With the increasing of feeding density, the pond water quality would worsen, however, there is no difference on water quality between 9 000 and 12 000 ind/hm2 groups.

Impacts of Aquaculture and Domestic Wastewater on the Water Quality of Santubong River, Malaysia

Developments along the Santubong River basin may have an impact on the aquatic ecosystem. To determine the impacts of activities on the water quality, ten stations were selected for water quality study over 9 months. Results show that salinity increases from 14.0 PSU upstream to 30.4 PSU downstream. Lowest DO range was 2.3-4.1 mg/L. TSS ranged was 20-135 mg/L and the highest was observed near construction and residential areas, the second and third highest near shrimp culture discharge areas. BOD5 was the highest near construction and residential areas. BOD5 of a station near shrimp culture was not significantly different from the residential areas. Two stations near shrimp culture site also recorded the highest Chl-a. The highest ammonia-nitrogen, nitrite-nitrogen and reactive phosphorus were observed at stations near shrimp farm sites whereas nitrate-nitrogen was the highest near construction and residential areas. Cage culture site showed the highest phosphorus and second highest nitrite-nitrogen and ammonia-nitrogen. This study showed that TSS and BOD5 were elevated near residential and construction areas and nutrients were elevated near shrimp farm sites resulting in algal bloom. Therefore, it is recommended that residential and shrimp farm discharge be treated to acceptable quality before discharge to protect the aquatic resources.

Food intake rate and delivery strategy in aquaculture

In aquaculture,it is important to estimate in advance how much food cultured animals would take.The rate of food consumption by cultured animals to available food amount is defined as the food intake rate(FIR) in this paper.To some extents,FIR reflects the quality of food,the health of cultured animals and the delivery efficiency.In practice,it is difficult to estimate in advance the accurate quantity of food that cultured animal needs.Usually,food is provided more than the need by animals,causing excess food that may pollute water and environment.Our experiments in past years show that FIR at 80% is recommended.

Treatment of Shrimp Pond Effluent Using Sedimentation Pond in the Tropics

Aquaculture plays a major role in providing the needed protein. However, there have been reports of negative impacts of shrimp farming which include environmental pollution. Therefore, shrimp pond effluent had to be retained for treatment. Treatment in tanks showed good improvement in water quality but in sedimentation ponds it may not be the case. Therefore, the objective of this study was to determine the water quality of effluent retained in sedimentation pond for a duration of 76 hours. Results show that water quality at 1/3 depth was better than 2/3 depth. There was an improvement in water quality with reductions of TSS, BOD5, COD, nitrate-N, nitrite-N, SRP and TP ranging from 25-52% except for DO and TAN. In addition, there was fluctuation of each parameter during the duration of study. It is important to monitor the water quality prior to the release of effluent so that it coincides with low nutrients and acceptable DO and partial release of the top 1/3 portion is recommended. There is a limit on the reduction achievable by sedimentation ponds likely due to processes occurring in the sediment. For higher reductions, other methods of effluent management and recovery of nutrients have to be considered.