Request for observations following the Tongan eruption and tsunami
Published: Fri Jan 21 2022 12:00 PM
We are interested in your observations of the sea and coastal areas following the Hunga Tonga-Hunga Ha’apai eruption on 15 January 2022. We would also like to know about “booming” sounds heard around the time of the eruption Saturday evening.
Our researchers would love to hear from you if you noticed any unusual behaviours of the sea or coastal areas in the hours and days following the eruption, or have photos and videos of this happening. We are also interested in experiences from people who heard the ‘booming’ sounds that travelled around the world during the eruption. Please follow the link below to share these with us.
A technique called environmental DNA or eDNA for short, is helping … identify the animal species present in our waterways. …
DNA is shed by aquatic life from their skin, scales, fluids and faeces. The technique is able to detect even minute traces of each species and the overall proportion of it within the water sample. The species of fish, birds, mammals, reptiles, plants, fungi, bacteria, insects, snails, worms and anything else are identified by comparing the DNA fragments to a reference database. This requires as little as a mug of water sucked through a filter, though more water increases the chance of detecting organisms.
Over the past couple of weeks Twitter user SirWB has published a fair few drone photos of Waikawa Beach. The following are posted with permission. All photos are from a drone and show various views of the river mouth, estuary and river, and Strathnaver.
Beware if you’re viewing using cell data — there are about 20 photos totalling around 10 MB. There is only one photo on the first page, the rest need a click to see them. No captions or alt text.
We received an email today from Craig Kidd, Horowhenua District Council Parks and Property Officer | Āpiha Papa Rēhia, Rawa. Note the request to remove acacia / wattle from your own properties:
Following checking the entrance on to the beach, the Acacia outside 61 & 63 Manga Pirau is out over the edge of the kerb.
While taking photos, I did not realise how much seed was on the plants, which there is a photo attached, and with the issue of acacia invading coastal dunes we are taking these out.
There is the reserve access opposite 52 Manga Pirau Street which the southern side has planted in acacia which we are removing under the pest management plan.
We will also try and cut out all the acacia from Hank Edwards back to the Southern end of Manga Pirau Street.
Can you please let the community know why we are undertaking removal of the wattle and ask if people have wattle on their properties, if they would consider removing it to help stop the acacia from spreading in the community and coastal reserves
If you have any queries please do not hesitate to contact us and we very appreciate the communities support.
Between around 8 pm on Sunday 05 December and 4 am on Wednesday 08 December 2021 my rain gauge recorded a tad less than 100 mm rain. That’s just a smidge less than 4 inches, if that measurement means more to you.
It wasn’t windy though, so the rain fell pretty much straight down, and we didn’t suffer the lashing of a furious storm.
If you check the LINZ Data Service maps you’ll see a great many streams around Waikawa, with the main feeds for our river from the hills in North and South Manakau. Between around Takapu Road and Emma Drive many streams run very close to or pass below Waikawa Beach Road.
Reports from late on Tuesday 07 December 2021 were that the road had flooded in a few spots. At around 8 am on Wednesday 08 December 2021 water had receded, but it was easy to see there was still plenty making its way across and through paddocks, and at some points water still lay almost all the way across the road. At the footbridge the river was running very full and swift.