The speed at which tide moves through an aquifer can vary significantly depending on several factors, including the characteristics of the aquifer, the tidal range, and the local geological conditions. In coastal areas where there is a strong connection between surface water bodies, such as oceans or seas, and underlying aquifers, tides can influence groundwater levels. The movement of tides through an aquifer typically occurs relatively slowly, on the order of centimeters to meters per day. This speed is primarily determined by the hydraulic conductivity of the aquifer material, which measures how easily water can flow through it. Highly permeable aquifers with sandy or gravelly soils tend to transmit tidal effects more quickly than less permeable aquifers with clayey or silt-rich soils. Additionally, the amplitude of the tide and the distance from the coast also play a role in determining the speed of tidal influence on groundwater levels. In some cases, the effects of tides on groundwater may not be readily noticeable, while in others, they can have a more pronounced impact, leading to saltwater intrusion into coastal aquifers, for example. Understanding the movement of tides in aquifers is crucial for managing groundwater resources in coastal regions and preventing saltwater contamination of freshwater aquifers.

John Price , by "tidal influence" are you thinking about saltwater intrusion into groundwater, or maybe something related to a higher stage in the river due to tides ?

Gaurav H Tandon : Beep, boop. Thank you for the AI generated response. Skynet thanks you. Beep, boop.

"Yes, copying content generated by ChatGPT without proper attribution can be considered plagiarism..."

( GPT 3.5, accessed 2023-10-03, https://chat.openai.com/ )

US Researchers should first teach their daddy a thing or two about Plagiarism before commenting on other's responses,

Harvard Law grad says Biden plagiarized 2000 journal article: ‘Heard this before’

https://nypost.com/2023/09/08/harvard-law-grad-accuses-biden-of-plagiarism/

Famous Plagiarism Cases That Will Surprise You ( Most of them are from US)

https://inkforall.com/copy-editing/plagiarism-checker/famous-plagiarism-cases/

Gaurav H Tandon ,

I assume you know I am not responsible for the actions of every U.S. citizen.

I'm not sure how pointing to the fact that some people in the world commit plagiarism is relevant to this discussion.

Should we assume from your response that you did in fact just post an (unattributed) response from Chat GPT ?

Should we also assume from your response that you in fact consider this plagiarism ?

In India We don't have any standard guidelines on Citation of AI Generated responses so I don't consider it as a case of Plagiarism, Still for my friends in US I will try to add attribution to my responses.

But I don't Understand for eminent professors like you guys what's the difference does it make If I try to answer unattended questions for the sake of curiosity, should I consider it as academic snobbery ?

Many questions goes unattended on research gate, have you seen how several students, researchers, in hope to get answer to their queries post questions in very poor broken English, should I correct them for their grammar or try to shed some light on their problems ?

so show some heart, not every one is as privileged as you guys and don't act like bullies. If you have some problem with my way of answering you can send me a personal message or mail instead of acting as if you have busted me.

"Fascinating."

-- Leonard Nimoy as Mr. Spock, S1.E10 of Star Trek (and many times thereafter) https://www.imdb.com/title/tt0708458/

Gaurav H Tandon, your response implies that other countries do have "standard guidelines on Citation of AI Generated responses", and that the reason American (and possibly Irish, English, and Canadian) RG members call out posts that look like they were generated via AI (without proper attribution) is because they have relevant national guidelines. I don't know what is going on in other countries, but if there are such national guidelines in Canada, I have never heard of them. In my view, posting AI-generated material without proper attribution is plagiarism, full stop. And this has nothing to do with national (or institutional) guidelines.

Gaurav H Tandon ,

On Chat GPT and plagiarism

• You might look at the following article from India Today for their sense of how Chat GPT use interacts with plagiarism.
• https://www.indiatoday.in/education-today/story/academia-fears-ai-fuelled-chatbots-like-chatgpt-can-promote-plagiarism-2318433-2023-01-07
• You might also check on the policy of your institution or employer. I imagine they would not agree with your take on the matter.

The point isn't plagiarism

• Plagiarism isn't the point, at least for me. That's really up to you.
• Personally, I absolutely don't understand why someone would paste copied text without attribution. I mean on a personal level. I can't imagine how that person doesn't feel like they're being dishonest. If a university student or journalist --- or, yes, speech writer --- does this, the response from others is nearly unanimous. But it's not my job to police the internet.
• The point isn't to bully or police people. There are several of us on these forums that have dedicated many hours, over many years now, devoting time and attention, double checking ourselves, and correcting each other, with the purpose of helping people. So we care about the quality of the information here. We do this probably without any benefit to ourselves. We do it because others helped us, and we learn by trying to solve problems others face.
• It used to be common for people to copy and paste from websites. Now it's common for people to paste answers from Chat GPT.
• These aren't helpful for people.
• Honestly, the information is often wrong or misleading.
• But also, the information often doesn't really answer the question. Because a person with experience can often intuit why the person is asking the question. Copied websites and AI responses can't do this.
• Furthermore, many people who use these forums don't speak English as their first language. It's unfair to expect them to wade through paragraphs of AI-generated text trying to find the relevant piece of information, when, often, none of it answers the question.
• I wish there were a way to tag these responses, so others don't waste their time trying to read through them.
• There are enough answers on these forums that are incorrect, misguided, or thoughtless, without adding to it by posting paragraphs of copied text.
• I'm pretty sure anyone capable of using ResearchGate is capable of using Chat GPT or Google. It doesn't help them to just respond with copied text. You might as well just say "Google it".

Why don't people just indicate the source of the text their pasting ?

• What amazes me the most is that people who do the copy-and-paste answers are so unwilling to acknowledge the source of what they're posting. I not sure I've ever seen a single case where someone responded to being called out by saying, "Yes, you're correct. I copied this from a website. I'll clearly add the attribution at the top of my post, so I don't mislead anyone."
• Instead, the response is almost invariably insults (sometimes really rather nasty), accusations of being a bully, or "mean" (very common), avoiding the issue (basically always), or --- recently new ones to me --- being called a "liberal", "snobbery", and implication of being prejudiced against people from certain counties.
• I'd really love to know what's behind it. Do people really think they're being helpful ? Or do they think they're getting some benefit ? Like their employer will be impressed that they answer a bunch of questions on ResearchGate ? Like other people don't just skip over long paragraphs of copied text ?

The above discussions from an AI generated source focused on ocean’s direct impact on groundwater. The question at hand is more challenging as it focuses on tidal effects on river backwater curves, and from that, effects of changes in river stage to watertable level in the alluvial aquifer. I don’t use AI in my writing, so my answer will not be as slick or simple. I suggest a two stage approach. First, study tidal effects on river stage using some backwater analyses. Backwater analyses are fairly straight forward for static delivery, but your challenge will be to apply those equations to a dynamic delivery, the tide. You should be able to develop some sort of relationship showing the effects of river flow and distance from the ocean to tidal response. Once you have the river level dynamic defined, a good groundwater model applied to the alluvial aquifer should get you your answer. My guess is that you will find the tidal effect on groundwater is likely much less than other effects, like water abstraction from the aquifer and seasonal variation in river stage, but I could be wrong! Here is one source that gives a good overview of modeling backwater curves: https://www.engr.psu.edu/ce/HEC/docs/backwater_curves.pdf

Good luck with adding a dynamic element to the static equations in this set of teaching notes.

In a more direct answer to your question, the rate of tidal impacts on an aquifer depends on the transmissivity of the aquifer. In a study did years ago in the Bahamas, we could see tidal influences 2 km from the coast of about 200 mm on groundwater with a lag time of several hours. You aquifers will have lower conductivity values, so I would expect it would be more than 24 hrs, and the influence would likely be hghly influenced not only by the tide, but by withdrawals from wells between your site and the ocean.

Followers of this thread may also be interested in the discussion Ronán Michael Conroy started recently:

https://www.researchgate.net/post/Is_it_ethical_to_use_ChatGPT_to_produce_answers_to_questions_and_then_pretend_you_have_written_them_yourself

Sal Mangiafico it is higher river stage. A tidal bore moves up the Columbia River from its mouth to as far as Portland, Oregon. The latter city is 85 miles upstream but there is still 1-2 feet of tidal influence. Longview is closer to the mouth so the tidal influence on river stage is greater than at Portland.